- 03 Feb, 2023 15 commits
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Namhyung Kim authored
It'd be useful to filter other than the current aggregation mode. For example, users may want to see callstacks for specific locks only. Or they may want tasks from a certain callstack. The tracepoints already collected the information but it needs to check the condition again when processing the event. And it needs to change BPF to allow the key combinations. The lock contentions on 'rcu_state' spinlock can be monitored: $ sudo perf lock con -abv -L rcu_state sleep 1 ... contended total wait max wait avg wait type caller 4 151.39 us 62.57 us 37.85 us spinlock rcu_core+0xcb 0xffffffff81fd1666 _raw_spin_lock_irqsave+0x46 0xffffffff8172d76b rcu_core+0xcb 0xffffffff822000eb __softirqentry_text_start+0xeb 0xffffffff816a0ba9 __irq_exit_rcu+0xc9 0xffffffff81fc0112 sysvec_apic_timer_interrupt+0xa2 0xffffffff82000e46 asm_sysvec_apic_timer_interrupt+0x16 0xffffffff81d49f78 cpuidle_enter_state+0xd8 0xffffffff81d4a259 cpuidle_enter+0x29 1 30.21 us 30.21 us 30.21 us spinlock rcu_core+0xcb 0xffffffff81fd1666 _raw_spin_lock_irqsave+0x46 0xffffffff8172d76b rcu_core+0xcb 0xffffffff822000eb __softirqentry_text_start+0xeb 0xffffffff816a0ba9 __irq_exit_rcu+0xc9 0xffffffff81fc00c4 sysvec_apic_timer_interrupt+0x54 0xffffffff82000e46 asm_sysvec_apic_timer_interrupt+0x16 1 28.84 us 28.84 us 28.84 us spinlock rcu_accelerate_cbs_unlocked+0x40 0xffffffff81fd1c60 _raw_spin_lock+0x30 0xffffffff81728cf0 rcu_accelerate_cbs_unlocked+0x40 0xffffffff8172da82 rcu_core+0x3e2 0xffffffff822000eb __softirqentry_text_start+0xeb 0xffffffff816a0ba9 __irq_exit_rcu+0xc9 0xffffffff81fc0112 sysvec_apic_timer_interrupt+0xa2 0xffffffff82000e46 asm_sysvec_apic_timer_interrupt+0x16 0xffffffff81d49f78 cpuidle_enter_state+0xd8 ... To see tasks calling 'rcu_core' function: $ sudo perf lock con -abt -S rcu_core sleep 1 contended total wait max wait avg wait pid comm 19 23.46 us 2.21 us 1.23 us 0 swapper 2 18.37 us 17.01 us 9.19 us 2061859 ThreadPoolForeg 3 5.76 us 1.97 us 1.92 us 3909 pipewire-pulse 1 2.26 us 2.26 us 2.26 us 1809271 MediaSu~isor #2 1 1.97 us 1.97 us 1.97 us 1514882 Chrome_ChildIOT 1 987 ns 987 ns 987 ns 3740 pipewire-pulse Signed-off-by:Namhyung Kim <namhyung@kernel.org> Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Hao Luo <haoluo@google.com> Cc: Ian Rogers <irogers@google.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Juri Lelli <juri.lelli@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Song Liu <song@kernel.org> Cc: bpf@vger.kernel.org Link: https://lore.kernel.org/r/20230203021324.143540-4-namhyung@kernel.orgSigned-off-by:
Arnaldo Carvalho de Melo <acme@redhat.com>
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Namhyung Kim authored
This is a preparation work to support complex keys of BPF maps. Now it has single value key according to the aggregation mode like stack_id or pid. But we want to use a combination of those keys. Then lock_contention_read() should still aggregate the result based on the key that was requested by user. The other key info will be used for filtering. So instead of creating a lock_stat entry always, Check if it's already there using lock_stat_find() first. Signed-off-by:
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Namhyung Kim authored
The lock_contention_get_name() returns a name for the lock stat entry based on the current aggregation mode. As it's called sequentially in a single thread, it can return the address of a static buffer for symbol and offset of the caller. Signed-off-by:
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Rob Herring authored
Arm SPEv1.2 adds a new optional address packet type: previous branch target. The recorded address is the target virtual address of the most recently taken branch in program order. Add support for decoding the address packet in raw dumps. Reviewed-by:
Leo Yan <leo.yan@linaro.org> Signed-off-by:
Rob Herring <robh@kernel.org> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Link: https://lore.kernel.org/r/20230203162401.132931-1-robh@kernel.orgSigned-off-by:
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Ian Rogers authored
Add a target that generates a log file for running metric_test.py and make this a dependency on generating pmu-events.c. The log output is displayed if the test fails like (the test was modified to make it fail): ``` TEST /tmp/perf/pmu-events/metric_test.log F...... ====================================================================== FAIL: test_Brackets (__main__.TestMetricExpressions) ---------------------------------------------------------------------- Traceback (most recent call last): File "tools/perf/pmu-events/metric_test.py", line 33, in test_Brackets self.assertEqual((a * b + c).ToPerfJson(), 'a * b + d') AssertionError: 'a * b + c' != 'a * b + d' - a * b + c ? ^ + a * b + d ? ^ ---------------------------------------------------------------------- Ran 7 tests in 0.004s FAILED (failures=1) make[3]: *** [pmu-events/Build:32: /tmp/perf/pmu-events/metric_test.log] Error 1 ``` However, normal execution will just show the TEST line. This is roughly modeled on fortify testing in the kernel lib directory. Modify metric_test.py so that it is executable. This is necessary when PYTHON isn't specified in the build, the normal case. Use variables to make the paths to files clearer and more consistent. Committer notes: Add pmu-events/metric_test.log to tools/perf/.gitignore and to the 'clean' target on tools/perf/Makefile.perf. Reviewed-by:Kajol Jain <kjain@linux.ibm.com> Signed-off-by:
Ian Rogers <irogers@google.com> Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Caleb Biggers <caleb.biggers@intel.com> Cc: Florian Fischer <florian.fischer@muhq.space> Cc: Ian Rogers <irogers@google.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: James Clark <james.clark@arm.com> Cc: Jing Zhang <renyu.zj@linux.alibaba.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: John Garry <john.g.garry@oracle.com> Cc: Kan Liang <kan.liang@linux.intel.com> Cc: Kang Minchul <tegongkang@gmail.com> Cc: Kim Phillips <kim.phillips@amd.com> Cc: Leo Yan <leo.yan@linaro.org> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Mike Leach <mike.leach@linaro.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Perry Taylor <perry.taylor@intel.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Ravi Bangoria <ravi.bangoria@amd.com> Cc: Rob Herring <robh@kernel.org> Cc: Sandipan Das <sandipan.das@amd.com> Cc: Stephane Eranian <eranian@google.com> Cc: Will Deacon <will@kernel.org> Cc: Xing Zhengjun <zhengjun.xing@linux.intel.com> Cc: linux-arm-kernel@lists.infradead.org Cc: linuxppc-dev@lists.ozlabs.org Link: https://lore.kernel.org/r/20230126233645.200509-16-irogers@google.comSigned-off-by:
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Ian Rogers authored
Add quiet_cmd_test so that: $(Q)$(call echo-cmd,test) will print: TEST <path> This is useful for executing compile-time tests similar to what happens for fortify tests in the kernel's lib directory. Reviewed-by:
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Ian Rogers authored
A character encoding issue added a "3D" character that breaks the metrics test. Fixes: 40769665 ("perf jevents: Parse metrics during conversion") Reviewed-by:
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Ian Rogers authored
The #slots literal will return NAN when not on ARM64 which causes a perf test failure when not on an ARM64 for a JEVENTS_ARCH=all build: .. 10.4: Parsing of PMU event table metrics with fake PMUs : FAILED! .. Add an is_test boolean so that the failure can be avoided when running as a test. Fixes: acef233b ("perf pmu: Add #slots literal support for arm64") Reviewed-by:
John Garry <john.g.garry@oracle.com> Reviewed-by:
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Ian Rogers authored
This allows the set of generated jevents events and metrics be limited to a subset of the model names. Appropriate if trying to minimize the binary size where only a set of models are possible. Reviewed-by:
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Ian Rogers authored
Turn a perf json event into an event, metric or both. This reduces the number of events needed to scan to find an event or metric. As events no longer need the relatively seldom used metric fields, 4 bytes is saved per event. This reduces the big C string's size by 335kb (14.8%) on x86. Note, for the test PMU architecture pme_test_soc_cpu is renamed pmu_events__test_soc_cpu for consistency with the event vs metric naming convention. Reviewed-by:
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Ian Rogers authored
Add a metrics table that is just a cast from pmu_events_table. This changes the APIs so that event and metric usage of the underlying table is different. For the no jevents case the tables are already separate, later changes will separate the tables for the jevents case. Reviewed-by:
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Ian Rogers authored
Combine into a single function to simplify, in a later change, writing metrics separately. Reviewed-by:
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Ian Rogers authored
Metrics are their own unit and these variables held broken metrics previously and now just hold the value NULL. Remove code that used these variables. Reviewed-by:
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Ian Rogers authored
Previous changes separated the uses of pmu_event and pmu_metric, however, both structures contained all the variables of event and metric. This change removes the event variables from metric and the metric variables from event. Note, this change removes the setting of evsel's metric_name/expr as these fields are no longer part of struct pmu_event. The metric remains but is no longer implicitly requested when the event is. This impacts a few Intel uncore events, however, as the ScaleUnit is shared by the event and the metric this utility is questionable. Also the MetricNames look broken (contain spaces) in some cases and when trying to use the functionality with '-e' the metrics fail but regular metrics with '-M' work. For example, on SkylakeX '-M' works: ``` $ perf stat -M LLC_MISSES.PCIE_WRITE -a sleep 1 Performance counter stats for 'system wide': 0 UNC_IIO_DATA_REQ_OF_CPU.MEM_WRITE.PART2 # 57896.0 Bytes LLC_MISSES.PCIE_WRITE (49.84%) 7,174 UNC_IIO_DATA_REQ_OF_CPU.MEM_WRITE.PART1 (49.85%) 0 UNC_IIO_DATA_REQ_OF_CPU.MEM_WRITE.PART3 (50.16%) 63 UNC_IIO_DATA_REQ_OF_CPU.MEM_WRITE.PART0 (50.15%) 1.004576381 seconds time elapsed ``` whilst the event '-e' version is broken even with --group/-g (fwiw, we should also remove -g [1]): ``` $ perf stat -g -e LLC_MISSES.PCIE_WRITE -g -a sleep 1 Add UNC_IIO_DATA_REQ_OF_CPU.MEM_WRITE.PART2 event to groups to get metric expression for LLC_MISSES.PCIE_WRITE Add UNC_IIO_DATA_REQ_OF_CPU.MEM_WRITE.PART1 event to groups to get metric expression for LLC_MISSES.PCIE_WRITE Add UNC_IIO_DATA_REQ_OF_CPU.MEM_WRITE.PART3 event to groups to get metric expression for LLC_MISSES.PCIE_WRITE Add UNC_IIO_DATA_REQ_OF_CPU.MEM_WRITE.PART0 event to groups to get metric expression for LLC_MISSES.PCIE_WRITE Add UNC_IIO_DATA_REQ_OF_CPU.MEM_WRITE.PART2 event to groups to get metric expression for LLC_MISSES.PCIE_WRITE Add UNC_IIO_DATA_REQ_OF_CPU.MEM_WRITE.PART1 event to groups to get metric expression for LLC_MISSES.PCIE_WRITE Add UNC_IIO_DATA_REQ_OF_CPU.MEM_WRITE.PART3 event to groups to get metric expression for LLC_MISSES.PCIE_WRITE Add UNC_IIO_DATA_REQ_OF_CPU.MEM_WRITE.PART0 event to groups to get metric expression for LLC_MISSES.PCIE_WRITE Add UNC_IIO_DATA_REQ_OF_CPU.MEM_WRITE.PART2 event to groups to get metric expression for LLC_MISSES.PCIE_WRITE Add UNC_IIO_DATA_REQ_OF_CPU.MEM_WRITE.PART1 event to groups to get metric expression for LLC_MISSES.PCIE_WRITE Add UNC_IIO_DATA_REQ_OF_CPU.MEM_WRITE.PART3 event to groups to get metric expression for LLC_MISSES.PCIE_WRITE Add UNC_IIO_DATA_REQ_OF_CPU.MEM_WRITE.PART0 event to groups to get metric expression for LLC_MISSES.PCIE_WRITE Add UNC_IIO_DATA_REQ_OF_CPU.MEM_WRITE.PART2 event to groups to get metric expression for LLC_MISSES.PCIE_WRITE Add UNC_IIO_DATA_REQ_OF_CPU.MEM_WRITE.PART1 event to groups to get metric expression for LLC_MISSES.PCIE_WRITE Add UNC_IIO_DATA_REQ_OF_CPU.MEM_WRITE.PART3 event to groups to get metric expression for LLC_MISSES.PCIE_WRITE Add UNC_IIO_DATA_REQ_OF_CPU.MEM_WRITE.PART0 event to groups to get metric expression for LLC_MISSES.PCIE_WRITE Add UNC_IIO_DATA_REQ_OF_CPU.MEM_WRITE.PART2 event to groups to get metric expression for LLC_MISSES.PCIE_WRITE Add UNC_IIO_DATA_REQ_OF_CPU.MEM_WRITE.PART1 event to groups to get metric expression for LLC_MISSES.PCIE_WRITE Add UNC_IIO_DATA_REQ_OF_CPU.MEM_WRITE.PART3 event to groups to get metric expression for LLC_MISSES.PCIE_WRITE Add UNC_IIO_DATA_REQ_OF_CPU.MEM_WRITE.PART0 event to groups to get metric expression for LLC_MISSES.PCIE_WRITE Add UNC_IIO_DATA_REQ_OF_CPU.MEM_WRITE.PART2 event to groups to get metric expression for LLC_MISSES.PCIE_WRITE Add UNC_IIO_DATA_REQ_OF_CPU.MEM_WRITE.PART1 event to groups to get metric expression for LLC_MISSES.PCIE_WRITE Add UNC_IIO_DATA_REQ_OF_CPU.MEM_WRITE.PART3 event to groups to get metric expression for LLC_MISSES.PCIE_WRITE Add UNC_IIO_DATA_REQ_OF_CPU.MEM_WRITE.PART0 event to groups to get metric expression for LLC_MISSES.PCIE_WRITE Performance counter stats for 'system wide': 27,316 Bytes LLC_MISSES.PCIE_WRITE 1.004505469 seconds time elapsed ``` The code also carries warnings where the user is supposed to select events for metrics [2] but given the lack of use of such a feature, let's clean the code and just remove. [1] https://lore.kernel.org/lkml/20220707195610.303254-1-irogers@google.com/ [2] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/tools/perf/util/stat-shadow.c?id=01b8957b738f42f96a130079bc951b3cc78c5b8a#n425Reviewed-by: -
Ian Rogers authored
Separate the event and metric table when building without jevents. Add find_core_metrics_table and perf_pmu__find_metrics_table while renaming existing utilities to be event specific, so that users can find the right table for their need. Committer notes: Fix the build on aarch64 with: tools/perf/arch/arm64/util/pmu.c @@ -32,7 +32,7 @@ const struct pmu_events_table *pmu_events_table__find(void) - return perf_pmu__find_table(pmu); + return perf_pmu__find_events_table(pmu); Reviewed-by:
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- 02 Feb, 2023 25 commits
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Ian Rogers authored
Create a new pmu_metric for the metric related variables from pmu_event but that is initially just a clone of pmu_event. Add iterators for pmu_metric and use in places that metrics are desired rather than events. Make the event iterator skip metric only events, and the metric iterator skip event only events. Reviewed-by:
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Ian Rogers authored
Rewrite metrics within the same file in terms of each other. For example, on Power8 other_stall_cpi is rewritten from: "PM_CMPLU_STALL / PM_RUN_INST_CMPL - PM_CMPLU_STALL_BRU_CRU / PM_RUN_INST_CMPL - PM_CMPLU_STALL_FXU / PM_RUN_INST_CMPL - PM_CMPLU_STALL_VSU / PM_RUN_INST_CMPL - PM_CMPLU_STALL_LSU / PM_RUN_INST_CMPL - PM_CMPLU_STALL_NTCG_FLUSH / PM_RUN_INST_CMPL - PM_CMPLU_STALL_NO_NTF / PM_RUN_INST_CMPL" to: "stall_cpi - bru_cru_stall_cpi - fxu_stall_cpi - vsu_stall_cpi - lsu_stall_cpi - ntcg_flush_cpi - no_ntf_stall_cpi" Which more closely matches the definition on Power9. To avoid recomputation decorate the function with a cache. Reviewed-by:
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Ian Rogers authored
Add RewriteMetricsInTermsOfOthers that iterates over pairs of names and expressions trying to replace an expression, within the current expression, with its name. Reviewed-by:
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Ian Rogers authored
rhs may not be defined, say for source_count, so add a guard. Reviewed-by:
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Sandipan Das authored
Show the branch speculation info if provided by the branch recording hardware feature. This can be useful for purposes of code optimization. E.g. $ perf record -j any,u ./test_branch $ perf report --dump-raw-trace Before: [...] 8380958377610 0x40b178 [0x1b0]: PERF_RECORD_SAMPLE(IP, 0x2): 7952/7952: 0x4f851a period: 48973 addr: 0 ... branch stack: nr:16 ..... 0: 00000000004b52fd -> 00000000004f82c0 0 cycles P 0 ..... 1: ffffffff8220137c -> 00000000004b52f0 0 cycles M 0 ..... 2: 000000000041d1c4 -> 00000000004b52f0 0 cycles P 0 ..... 3: 00000000004e7ead -> 000000000041d1b0 0 cycles M 0 ..... 4: 00000000004e7f91 -> 00000000004e7ead 0 cycles P 0 ..... 5: 00000000004e7ea8 -> 00000000004e7f70 0 cycles P 0 ..... 6: 00000000004e7e52 -> 00000000004e7e98 0 cycles M 0 ..... 7: 00000000004e7e1f -> 00000000004e7e40 0 cycles M 0 ..... 8: 00000000004e7f60 -> 00000000004e7df0 0 cycles P 0 ..... 9: 00000000004e7f58 -> 00000000004e7f60 0 cycles M 0 ..... 10: 000000000041d85d -> 00000000004e7f50 0 cycles P 0 ..... 11: 000000000043306a -> 000000000041d840 0 cycles P 0 ..... 12: ffffffff8220137c -> 0000000000433040 0 cycles M 0 ..... 13: 000000000041e4a1 -> 0000000000433040 0 cycles P 0 ..... 14: ffffffff8220137c -> 000000000041e490 0 cycles M 0 ..... 15: 000000000041d89b -> 000000000041e487 0 cycles P 0 ... thread: test_branch:7952 ...... dso: /data/sandipan/test_branch [...] After: [...] 8380958377610 0x40b178 [0x1b0]: PERF_RECORD_SAMPLE(IP, 0x2): 7952/7952: 0x4f851a period: 48973 addr: 0 ... branch stack: nr:16 ..... 0: 00000000004b52fd -> 00000000004f82c0 0 cycles P 0 NON_SPEC_CORRECT_PATH ..... 1: ffffffff8220137c -> 00000000004b52f0 0 cycles M 0 NON_SPEC_CORRECT_PATH ..... 2: 000000000041d1c4 -> 00000000004b52f0 0 cycles P 0 NON_SPEC_CORRECT_PATH ..... 3: 00000000004e7ead -> 000000000041d1b0 0 cycles M 0 NON_SPEC_CORRECT_PATH ..... 4: 00000000004e7f91 -> 00000000004e7ead 0 cycles P 0 NON_SPEC_CORRECT_PATH ..... 5: 00000000004e7ea8 -> 00000000004e7f70 0 cycles P 0 NON_SPEC_CORRECT_PATH ..... 6: 00000000004e7e52 -> 00000000004e7e98 0 cycles M 0 SPEC_CORRECT_PATH ..... 7: 00000000004e7e1f -> 00000000004e7e40 0 cycles M 0 NON_SPEC_CORRECT_PATH ..... 8: 00000000004e7f60 -> 00000000004e7df0 0 cycles P 0 NON_SPEC_CORRECT_PATH ..... 9: 00000000004e7f58 -> 00000000004e7f60 0 cycles M 0 NON_SPEC_CORRECT_PATH ..... 10: 000000000041d85d -> 00000000004e7f50 0 cycles P 0 NON_SPEC_CORRECT_PATH ..... 11: 000000000043306a -> 000000000041d840 0 cycles P 0 NON_SPEC_CORRECT_PATH ..... 12: ffffffff8220137c -> 0000000000433040 0 cycles M 0 NON_SPEC_CORRECT_PATH ..... 13: 000000000041e4a1 -> 0000000000433040 0 cycles P 0 NON_SPEC_CORRECT_PATH ..... 14: ffffffff8220137c -> 000000000041e490 0 cycles M 0 NON_SPEC_CORRECT_PATH ..... 15: 000000000041d89b -> 000000000041e487 0 cycles P 0 NON_SPEC_CORRECT_PATH ... thread: test_branch:7952 ...... dso: /data/sandipan/test_branch [...] With the addition of new branch flags, the "brstacksym" fields in perf script output now shows speculation information after the branch type. Change the regular expressions accordingly for the test to pass. Since branch speculation information may vary across platforms, the test does not look for specific values. E.g. $ perf test -v 110 Before: 110: Check branch stack sampling : --- start --- test child forked, pid 54154 Testing user branch stack sampling + grep -E -m1 ^brstack_bench\+[^ ]*/brstack_foo\+[^ ]*/IND_CALL$ /tmp/__perf_test.program.AfhUI/perf.script + cleanup + rm -rf /tmp/__perf_test.program.AfhUI test child finished with -1 ---- end ---- Check branch stack sampling: FAILED! After: 110: Check branch stack sampling : --- start --- test child forked, pid 43716 Testing user branch stack sampling + grep -E -m1 ^brstack_bench\+[^ ]*/brstack_foo\+[^ ]*/IND_CALL/.*$ /tmp/__perf_test.program.xgzAi/perf.script brstack_bench+0x66/brstack_foo+0x0/P/-/-/0/IND_CALL/NON_SPEC_CORRECT_PATH + grep -E -m1 ^brstack_foo\+[^ ]*/brstack_bar\+[^ ]*/CALL/.*$ /tmp/__perf_test.program.xgzAi/perf.script brstack_foo+0x1b/brstack_bar+0x0/P/-/-/0/CALL/NON_SPEC_CORRECT_PATH + grep -E -m1 ^brstack_bench\+[^ ]*/brstack_foo\+[^ ]*/CALL/.*$ /tmp/__perf_test.program.xgzAi/perf.script brstack_bench+0x58/brstack_foo+0x0/P/-/-/0/CALL/NON_SPEC_CORRECT_PATH + grep -E -m1 ^brstack_bench\+[^ ]*/brstack_bar\+[^ ]*/CALL/.*$ /tmp/__perf_test.program.xgzAi/perf.script brstack_bench+0x5d/brstack_bar+0x0/P/-/-/0/CALL/NON_SPEC_CORRECT_PATH + grep -E -m1 ^brstack_bar\+[^ ]*/brstack_foo\+[^ ]*/RET/.*$ /tmp/__perf_test.program.xgzAi/perf.script brstack_bar+0x31/brstack_foo+0x20/P/-/-/0/RET/NON_SPEC_CORRECT_PATH + grep -E -m1 ^brstack_foo\+[^ ]*/brstack_bench\+[^ ]*/RET/.*$ /tmp/__perf_test.program.xgzAi/perf.script brstack_foo+0x36/brstack_bench+0x5d/P/-/-/0/RET/NON_SPEC_CORRECT_PATH + grep -E -m1 ^brstack_bench\+[^ ]*/brstack_bench\+[^ ]*/COND/.*$ /tmp/__perf_test.program.xgzAi/perf.script brstack_bench+0x76/brstack_bench+0x7d/P/-/-/0/COND/NON_SPEC_CORRECT_PATH + grep -E -m1 ^brstack\+[^ ]*/brstack\+[^ ]*/UNCOND/.*$ /tmp/__perf_test.program.xgzAi/perf.script brstack+0x5a/brstack+0x41/P/-/-/0/UNCOND/NON_SPEC_CORRECT_PATH + set +x Testing branch stack filtering permutation (any_call,CALL|IND_CALL|COND_CALL|SYSCALL|IRQ) Testing branch stack filtering permutation (call,CALL|SYSCALL) Testing branch stack filtering permutation (cond,COND) Testing branch stack filtering permutation (any_ret,RET|COND_RET|SYSRET|ERET) Testing branch stack filtering permutation (call,cond,CALL|SYSCALL|COND) Testing branch stack filtering permutation (any_call,cond,CALL|IND_CALL|COND_CALL|IRQ|SYSCALL|COND) Testing branch stack filtering permutation (cond,any_call,any_ret,COND|CALL|IND_CALL|COND_CALL|SYSCALL|IRQ|RET|COND_RET|SYSRET|ERET) test child finished with 0 ---- end ---- Check branch stack sampling: Ok Signed-off-by:
Sandipan Das <sandipan.das@amd.com> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Ananth Narayan <ananth.narayan@amd.com> Cc: Borislav Petkov <bp@alien8.de> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: Ian Rogers <irogers@google.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: James Clark <james.clark@arm.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Kajol Jain <kjain@linux.ibm.com> Cc: Madhavan Srinivasan <maddy@linux.ibm.com> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Ravi Bangoria <ravi.bangoria@amd.com> Cc: Santosh Shukla <santosh.shukla@amd.com> Cc: Stephane Eranian <eranian@google.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Thomas Richter <tmricht@linux.ibm.com> Cc: x86@kernel.org Link: https://lore.kernel.org/r/048d67c9de3cc8e3dbf19aaa7ff718dec91364c5.1675333809.git.sandipan.das@amd.comSigned-off-by:
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Sandipan Das authored
Show the branch speculation info if provided by the branch recording hardware feature. This can be useful for optimizing code further. The speculation info is appended to the end of the list of fields so any existing tools that use "/" as a delimiter for access fields via an index remain unaffected. Also show "-" instead of "N/A" when speculation info is unavailable because "/" is used as the field separator. E.g. $ perf record -j any,u,save_type ./test_branch $ perf script --fields brstacksym Before: [...] check_match+0x60/strcmp+0x0/P/-/-/0/CALL do_lookup_x+0x3c5/check_match+0x0/P/-/-/0/CALL [...] After: [...] check_match+0x60/strcmp+0x0/P/-/-/0/CALL/NON_SPEC_CORRECT_PATH do_lookup_x+0x3c5/check_match+0x0/P/-/-/0/CALL/NON_SPEC_CORRECT_PATH [...] The bitfield swapping scheme used duing sample parsing has changed because of the addition of new branch flags, namely "spec", "new_type" and "priv". Earlier, these were all part of the "reserved" field but now, each of these fields get swapped separately. Change the expected flag values accordingly for the test to pass. E.g. $ perf test -v 27 Before: 27: Sample parsing : --- start --- test child forked, pid 61979 parsing failed for sample_type 0x800 test child finished with -1 ---- end ---- Sample parsing: FAILED! After: 27: Sample parsing : --- start --- test child forked, pid 63293 test child finished with 0 ---- end ---- Sample parsing: Ok Signed-off-by:
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Namhyung Kim authored
Check callstack filter with two different aggregation mode. $ sudo ./perf test -v contention 88: kernel lock contention analysis test : --- start --- test child forked, pid 83416 Testing perf lock record and perf lock contention Testing perf lock contention --use-bpf Testing perf lock record and perf lock contention at the same time Testing perf lock contention --threads Testing perf lock contention --lock-addr Testing perf lock contention --type-filter (w/ spinlock) Testing perf lock contention --lock-filter (w/ tasklist_lock) Testing perf lock contention --callstack-filter (w/ unix_stream) Testing perf lock contention --callstack-filter with task aggregation test child finished with 0 ---- end ---- kernel lock contention analysis test: Ok Signed-off-by:
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Tiezhu Yang authored
This commit adds the execve syscall benchmark, more syscall benchmarks can be added in the future. Signed-off-by:
Tiezhu Yang <yangtiezhu@loongson.cn> Acked-by:
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Tiezhu Yang authored
This commit adds a simple getpgid syscall benchmark, more syscall benchmarks can be added in the future. Signed-off-by:
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Tiezhu Yang authored
In the current code, there is only a basic syscall benchmark via getppid, this is not enough. Introduce bench_syscall_common() so that we can add more syscalls to benchmark. This is preparation for later patch, no functionality change. Signed-off-by:
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Tiezhu Yang authored
It is better to keep list sorted by number in unistd_{32,64}.h, so that we can add more syscall number to a proper position. This is preparation for later patch, no functionality change. Signed-off-by: -
Diederik de Haas authored
As detailed in https://www.shellcheck.net/wiki/SC2006: The use of `...` is legacy syntax with several issues: 1. It has a series of undefined behaviors related to quoting in POSIX. 2. It imposes a custom escaping mode with surprising results. 3. It's exceptionally hard to nest. $(...) command substitution has none of these problems, and is therefore strongly encouraged. Signed-off-by:
Diederik de Haas <didi.debian@cknow.org> Acked-by:
Carsten Haitzler <carsten.haitzler@arm.com> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Link: https://lore.kernel.org/r/20230201214945.127474-3-didi.debian@cknow.orgSigned-off-by:
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Diederik de Haas authored
To count the number of results from grep, use the '-c' parameter instead of piping it to 'wc'. See also https://www.shellcheck.net/wiki/SC2126Signed-off-by:
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Namhyung Kim authored
The current display code for perf stat iterates given cpus and build the aggr map to collect the event data for the aggregation mode. But uncore events have their own cpu maps and it won't guarantee that it'd match to the aggr map. For example, per-package uncore events would generate a single value for each socket. When user asks per-core aggregation mode, the output would contain 0 values for other cores. Thus it needs to check the uncore PMU's cpumask and if it matches to the current aggregation id. Before: $ sudo ./perf stat -a --per-core -e power/energy-pkg/ sleep 1 Performance counter stats for 'system wide': S0-D0-C0 1 3.73 Joules power/energy-pkg/ S0-D0-C1 0 <not counted> Joules power/energy-pkg/ S0-D0-C2 0 <not counted> Joules power/energy-pkg/ S0-D0-C3 0 <not counted> Joules power/energy-pkg/ 1.001404046 seconds time elapsed Some events weren't counted. Try disabling the NMI watchdog: echo 0 > /proc/sys/kernel/nmi_watchdog perf stat ... echo 1 > /proc/sys/kernel/nmi_watchdog The core 1, 2 and 3 should not be printed because the event is handled in a cpu in the core 0 only. With this change, the output becomes like below. After: $ sudo ./perf stat -a --per-core -e power/energy-pkg/ sleep 1 Performance counter stats for 'system wide': S0-D0-C0 1 2.09 Joules power/energy-pkg/ Fixes: b8976135 ("perf stat: Update event skip condition for system-wide per-thread mode and merged uncore and hybrid events") Signed-off-by: -
Namhyung Kim authored
The -S/--callstack-filter is to limit display entries having the given string in the callstack (not only in the caller in the output). The following example shows lock contention results if the callstack has 'net' substring somewhere. Note that the caller '__dev_queue_xmit' does not match to it, but it has 'inet6_csk_xmit' in the callstack. This applies even if you don't use -v option to show the full callstack. $ sudo ./perf lock con -abv -S net sleep 1 ... contended total wait max wait avg wait type caller 5 70.20 us 16.13 us 14.04 us spinlock __dev_queue_xmit+0xb6d 0xffffffffa5dd1c60 _raw_spin_lock+0x30 0xffffffffa5b8f6ed __dev_queue_xmit+0xb6d 0xffffffffa5cd8267 ip6_finish_output2+0x2c7 0xffffffffa5cdac14 ip6_finish_output+0x1d4 0xffffffffa5cdb477 ip6_xmit+0x457 0xffffffffa5d1fd17 inet6_csk_xmit+0xd7 0xffffffffa5c5f4aa __tcp_transmit_skb+0x54a 0xffffffffa5c6467d tcp_keepalive_timer+0x2fd Signed-off-by: -
Namhyung Kim authored
There's no field for the cgroup, let's add one. To do that, users need to specify --all-cgroup option for perf record to capture the cgroup info. $ perf record --all-cgroups -- true $ perf script -F comm,pid,cgroup true 337112 /user.slice/user-657345.slice/user@657345.service/... true 337112 /user.slice/user-657345.slice/user@657345.service/... true 337112 /user.slice/user-657345.slice/user@657345.service/... true 337112 /user.slice/user-657345.slice/user@657345.service/... If it's recorded without the --all-cgroups, it'd complain. $ perf script -F comm,pid,cgroup Samples for 'cycles:u' event do not have CGROUP attribute set. Cannot print 'cgroup' field. Hint: run 'perf record --all-cgroups ...' Signed-off-by: -
Ross Zwisler authored
The canonical location for the tracefs filesystem is at /sys/kernel/tracing. But, from Documentation/trace/ftrace.rst: Before 4.1, all ftrace tracing control files were within the debugfs file system, which is typically located at /sys/kernel/debug/tracing. For backward compatibility, when mounting the debugfs file system, the tracefs file system will be automatically mounted at: /sys/kernel/debug/tracing A few spots in the perf docs still refer to this older debugfs path, so let's update them to avoid confusion. Signed-off-by:
Ross Zwisler <zwisler@google.com> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Steven Rostedt (VMware) <rostedt@goodmis.org> Cc: linux-trace-kernel@vger.kernel.org Link: http://lore.kernel.org/lkml/20230130181915.1113313-5-zwisler@google.comSigned-off-by:
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Rob Herring authored
Unknown address packet indexes are not an error as the Arm architecture can (and has with SPEv1.2) define new ones and implementation defined ones are also allowed. The error message for every occurrence of the packet is needlessly noisy as well. Change the message to print just once for each unknown index. Reviewed-by:
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Krister Johansen authored
This problem was encountered on an arm64 system with a lot of memory. Without kernel debug symbols installed, and with both kcore and kallsyms available, perf managed to get confused and returned "unknown" for all of the kernel symbols that it tried to look up. On this system, stext fell within the vmalloc segment. The kcore symbol matching code tries to find the first segment that contains stext and uses that to replace the segment generated from just the kallsyms information. In this case, however, there were two: a very large vmalloc segment, and the text segment. This caused perf to get confused because multiple overlapping segments were inserted into the RB tree that holds the discovered segments. However, that alone wasn't sufficient to cause the problem. Even when we could find the segment, the offsets were adjusted in such a way that the newly generated symbols didn't line up with the instruction addresses in the trace. The most obvious solution would be to consult which segment type is text from kcore, but this information is not exposed to users. Instead, select the smallest matching segment that contains stext instead of the first matching segment. This allows us to match the text segment instead of vmalloc, if one is contained within the other. Reviewed-by:
Adrian Hunter <adrian.hunter@intel.com> Signed-off-by:
Krister Johansen <kjlx@templeofstupid.com> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: David Reaver <me@davidreaver.com> Cc: Ian Rogers <irogers@google.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Michael Petlan <mpetlan@redhat.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Link: http://lore.kernel.org/lkml/20230125183418.GD1963@templeofstupid.comSigned-off-by:
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Athira Rajeev authored
While parsing the tracepoint events in parse_events_add_tracepoint() function, code checks for HAVE_LIBTRACEEVENT support. This is needed since libtraceevent is necessary for tracepoint. But while adding probe points, check for LIBTRACEEVENT is not done in case of perf probe. Hence, in environment with missing libtraceevent-devel, it is observed that adding a probe point shows below message though it can't be used via perf record. Example: Adding probe point: ./perf probe 'vfs_getname=getname_flags:72 pathname=result->name:string' Added new event: probe:vfs_getname (on getname_flags:72 with pathname=result->name:string) You can now use it in all perf tools, such as: perf record -e probe:vfs_getname -aR sleep 1 But trying perf record: ./perf record -e probe:vfs_getname -aR sleep 1 event syntax error: 'probe:vfs_getname' \___ unsupported tracepoint libtraceevent is necessary for tracepoint support Run 'perf list' for a list of valid events The builtin tool like perf record needs libtraceevent to parse tracefs. But still the probe can be used by enabling via tracefs. Patch fixes the probe usage message to the user based on presence of libtraceevent. With the fix, # ./perf probe 'pmu:myprobe=schedule' Added new event: pmu:myprobe (on schedule) perf is not linked with libtraceevent, to use the new probe you can use tracefs: cd /sys/kernel/tracing/ echo 1 > events/pmu/myprobe/enable echo 1 > tracing_on cat trace_pipe Before removing the probe, echo 0 > events/pmu/myprobe/enable Signed-off-by:
Athira Rajeev <atrajeev@linux.vnet.ibm.com> Cc: Andi Kleen <ak@linux.intel.com> Cc: Disha Goel <disgoel@linux.ibm.com> Cc: Ian Rogers <irogers@google.com> Cc: James Clark <james.clark@arm.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Kajol Jain <kjain@linux.ibm.com> Cc: Madhavan Srinivasan <maddy@linux.vnet.ibm.com> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Nageswara R Sastry <rnsastry@linux.ibm.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: linuxppc-dev@lists.ozlabs.org Link: https://lore.kernel.org/r/20230131134748.54567-1-atrajeev@linux.vnet.ibm.comSigned-off-by:
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Adrian Hunter authored
For x86_64, determine a symbol for .plt.got entries. That requires computing the target offset and finding that in .rela.dyn, which in turn means .rela.dyn needs to be sorted by offset. Example: In this example, the GNU C Library is using .plt.got for malloc and free. Before: $ gcc --version gcc (Ubuntu 11.3.0-1ubuntu1~22.04) 11.3.0 Copyright (C) 2021 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. $ perf record -e intel_pt//u uname Linux [ perf record: Woken up 1 times to write data ] [ perf record: Captured and wrote 0.027 MB perf.data ] $ perf script --itrace=be --ns -F-event,+addr,-period,-comm,-tid,-cpu > /tmp/cmp1.txt After: $ perf script --itrace=be --ns -F-event,+addr,-period,-comm,-tid,-cpu > /tmp/cmp2.txt $ diff /tmp/cmp1.txt /tmp/cmp2.txt | head -12 15509,15510c15509,15510 < 27046.755390907: 7f0b2943e3ab _nl_normalize_codeset+0x5b (/usr/lib/x86_64-linux-gnu/libc.so.6) => 7f0b29428380 offset_0x28380@plt+0x0 (/usr/lib/x86_64-linux-gnu/libc.so.6) < 27046.755390907: 7f0b29428384 offset_0x28380@plt+0x4 (/usr/lib/x86_64-linux-gnu/libc.so.6) => 7f0b294a5120 malloc+0x0 (/usr/lib/x86_64-linux-gnu/libc.so.6) --- > 27046.755390907: 7f0b2943e3ab _nl_normalize_codeset+0x5b (/usr/lib/x86_64-linux-gnu/libc.so.6) => 7f0b29428380 malloc@plt+0x0 (/usr/lib/x86_64-linux-gnu/libc.so.6) > 27046.755390907: 7f0b29428384 malloc@plt+0x4 (/usr/lib/x86_64-linux-gnu/libc.so.6) => 7f0b294a5120 malloc+0x0 (/usr/lib/x86_64-linux-gnu/libc.so.6) 15821,15822c15821,15822 < 27046.755394865: 7f0b2943850c _nl_load_locale_from_archive+0x5bc (/usr/lib/x86_64-linux-gnu/libc.so.6) => 7f0b29428370 offset_0x28370@plt+0x0 (/usr/lib/x86_64-linux-gnu/libc.so.6) < 27046.755394865: 7f0b29428374 offset_0x28370@plt+0x4 (/usr/lib/x86_64-linux-gnu/libc.so.6) => 7f0b294a5460 cfree@GLIBC_2.2.5+0x0 (/usr/lib/x86_64-linux-gnu/libc.so.6) --- > 27046.755394865: 7f0b2943850c _nl_load_locale_from_archive+0x5bc (/usr/lib/x86_64-linux-gnu/libc.so.6) => 7f0b29428370 free@plt+0x0 (/usr/lib/x86_64-linux-gnu/libc.so.6) > 27046.755394865: 7f0b29428374 free@plt+0x4 (/usr/lib/x86_64-linux-gnu/libc.so.6) => 7f0b294a5460 cfree@GLIBC_2.2.5+0x0 (/usr/lib/x86_64-linux-gnu/libc.so.6) Reviewed-by: -
Adrian Hunter authored
For x86, .plt.got is used, for example, when the address is taken of a dynamically linked function. Start adding support by synthesizing a symbol for each entry. A subsequent patch will attempt to get a better name for the symbol. Example: Before: $ cat tstpltlib.c void fn1(void) {} void fn2(void) {} void fn3(void) {} void fn4(void) {} $ cat tstpltgot.c void fn1(void); void fn2(void); void fn3(void); void fn4(void); void callfn(void (*fn)(void)) { fn(); } int main() { fn4(); fn1(); callfn(fn3); fn2(); fn3(); return 0; } $ gcc --version gcc (Ubuntu 11.3.0-1ubuntu1~22.04) 11.3.0 Copyright (C) 2021 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. $ gcc -Wall -Wextra -shared -o libtstpltlib.so tstpltlib.c $ gcc -Wall -Wextra -o tstpltgot tstpltgot.c -L . -ltstpltlib -Wl,-rpath="$(pwd)" $ readelf -SW tstpltgot | grep 'Name\|plt\|dyn' [Nr] Name Type Address Off Size ES Flg Lk Inf Al [ 6] .dynsym DYNSYM 00000000000003d8 0003d8 0000f0 18 A 7 1 8 [ 7] .dynstr STRTAB 00000000000004c8 0004c8 0000c6 00 A 0 0 1 [10] .rela.dyn RELA 00000000000005d8 0005d8 0000d8 18 A 6 0 8 [11] .rela.plt RELA 00000000000006b0 0006b0 000048 18 AI 6 24 8 [13] .plt PROGBITS 0000000000001020 001020 000040 10 AX 0 0 16 [14] .plt.got PROGBITS 0000000000001060 001060 000020 10 AX 0 0 16 [15] .plt.sec PROGBITS 0000000000001080 001080 000030 10 AX 0 0 16 [23] .dynamic DYNAMIC 0000000000003d90 002d90 000210 10 WA 7 0 8 $ perf record -e intel_pt//u --filter 'filter main @ ./tstpltgot , filter callfn @ ./tstpltgot' ./tstpltgot [ perf record: Woken up 1 times to write data ] [ perf record: Captured and wrote 0.011 MB perf.data ] $ perf script --itrace=be --ns -F+flags,-event,+addr,-period,-comm,-tid,-cpu,-dso 28393.810326915: tr strt 0 [unknown] => 562350baa1b2 main+0x0 28393.810326915: tr end call 562350baa1ba main+0x8 => 562350baa090 fn4@plt+0x0 28393.810326917: tr strt 0 [unknown] => 562350baa1bf main+0xd 28393.810326917: tr end call 562350baa1bf main+0xd => 562350baa080 fn1@plt+0x0 28393.810326917: tr strt 0 [unknown] => 562350baa1c4 main+0x12 28393.810326917: call 562350baa1ce main+0x1c => 562350baa199 callfn+0x0 28393.810326917: tr end call 562350baa1ad callfn+0x14 => 7f607d36110f fn3+0x0 28393.810326922: tr strt 0 [unknown] => 562350baa1af callfn+0x16 28393.810326922: return 562350baa1b1 callfn+0x18 => 562350baa1d3 main+0x21 28393.810326922: tr end call 562350baa1d3 main+0x21 => 562350baa0a0 fn2@plt+0x0 28393.810326924: tr strt 0 [unknown] => 562350baa1d8 main+0x26 28393.810326924: tr end call 562350baa1d8 main+0x26 => 562350baa060 [unknown] <- call to fn3 via .plt.got 28393.810326925: tr strt 0 [unknown] => 562350baa1dd main+0x2b 28393.810326925: tr end return 562350baa1e3 main+0x31 => 7f607d029d90 __libc_start_call_main+0x80 After: $ perf script --itrace=be --ns -F+flags,-event,+addr,-period,-comm,-tid,-cpu,-dso 28393.810326915: tr strt 0 [unknown] => 562350baa1b2 main+0x0 28393.810326915: tr end call 562350baa1ba main+0x8 => 562350baa090 fn4@plt+0x0 28393.810326917: tr strt 0 [unknown] => 562350baa1bf main+0xd 28393.810326917: tr end call 562350baa1bf main+0xd => 562350baa080 fn1@plt+0x0 28393.810326917: tr strt 0 [unknown] => 562350baa1c4 main+0x12 28393.810326917: call 562350baa1ce main+0x1c => 562350baa199 callfn+0x0 28393.810326917: tr end call 562350baa1ad callfn+0x14 => 7f607d36110f fn3+0x0 28393.810326922: tr strt 0 [unknown] => 562350baa1af callfn+0x16 28393.810326922: return 562350baa1b1 callfn+0x18 => 562350baa1d3 main+0x21 28393.810326922: tr end call 562350baa1d3 main+0x21 => 562350baa0a0 fn2@plt+0x0 28393.810326924: tr strt 0 [unknown] => 562350baa1d8 main+0x26 28393.810326924: tr end call 562350baa1d8 main+0x26 => 562350baa060 offset_0x1060@plt+0x0 28393.810326925: tr strt 0 [unknown] => 562350baa1dd main+0x2b 28393.810326925: tr end return 562350baa1e3 main+0x31 => 7f607d029d90 __libc_start_call_main+0x80 Reviewed-by: -
Adrian Hunter authored
A statically linked executable can have a .plt due to IFUNCs, in which case .symtab is used not .dynsym. Check the section header link to see if that is the case, and then use symtab instead. Example: Before: $ cat tstifunc.c #include <stdio.h> void thing1(void) { printf("thing1\n"); } void thing2(void) { printf("thing2\n"); } typedef void (*thing_fn_t)(void); thing_fn_t thing_ifunc(void) { int x; if (x & 1) return thing2; return thing1; } void thing(void) __attribute__ ((ifunc ("thing_ifunc"))); int main() { thing(); return 0; } $ gcc --version gcc (Ubuntu 11.3.0-1ubuntu1~22.04) 11.3.0 Copyright (C) 2021 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. $ gcc -static -Wall -Wextra -Wno-uninitialized -o tstifuncstatic tstifunc.c $ readelf -SW tstifuncstatic | grep 'Name\|plt\|dyn' [Nr] Name Type Address Off Size ES Flg Lk Inf Al [ 4] .rela.plt RELA 00000000004002e8 0002e8 000258 18 AI 29 20 8 [ 6] .plt PROGBITS 0000000000401020 001020 000190 00 AX 0 0 16 [20] .got.plt PROGBITS 00000000004c5000 0c4000 0000e0 08 WA 0 0 8 $ perf record -e intel_pt//u --filter 'filter main @ ./tstifuncstatic' ./tstifuncstatic thing1 [ perf record: Woken up 1 times to write data ] [ perf record: Captured and wrote 0.008 MB perf.data ] $ perf script --itrace=be --ns -F+flags,-event,+addr,-period,-comm,-tid,-cpu,-dso 15786.690189535: tr strt 0 [unknown] => 4017cd main+0x0 15786.690189535: tr end call 4017d5 main+0x8 => 401170 [unknown] 15786.690197660: tr strt 0 [unknown] => 4017da main+0xd 15786.690197660: tr end return 4017e0 main+0x13 => 401c1a __libc_start_call_main+0x6a After: $ perf script --itrace=be --ns -F+flags,-event,+addr,-period,-comm,-tid,-cpu,-dso 15786.690189535: tr strt 0 [unknown] => 4017cd main+0x0 15786.690189535: tr end call 4017d5 main+0x8 => 401170 thing_ifunc@plt+0x0 15786.690197660: tr strt 0 [unknown] => 4017da main+0xd 15786.690197660: tr end return 4017e0 main+0x13 => 401c1a __libc_start_call_main+0x6a Reviewed-by: -
Adrian Hunter authored
A static executable can have a .plt due to the presence of IFUNCs. In that case the .plt does not have a header. Check for whether there is a header by comparing the number of entries to the number of relocation entries. Reviewed-by:
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Adrian Hunter authored
For x86_64, the GNU linker is putting IFUNC information in the relocation addend, so use it to try to find a symbol for plt entries that refer to IFUNCs. Example: Before: $ cat tstpltlib.c void fn1(void) {} void fn2(void) {} void fn3(void) {} void fn4(void) {} $ cat tstpltifunc.c #include <stdio.h> void thing1(void) { printf("thing1\n"); } void thing2(void) { printf("thing2\n"); } typedef void (*thing_fn_t)(void); thing_fn_t thing_ifunc(void) { int x; if (x & 1) return thing2; return thing1; } void thing(void) __attribute__ ((ifunc ("thing_ifunc"))); void fn1(void); void fn2(void); void fn3(void); void fn4(void); int main() { fn4(); fn1(); thing(); fn2(); fn3(); return 0; } $ gcc --version gcc (Ubuntu 11.3.0-1ubuntu1~22.04) 11.3.0 Copyright (C) 2021 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. $ gcc -Wall -Wextra -shared -o libtstpltlib.so tstpltlib.c $ gcc -Wall -Wextra -Wno-uninitialized -o tstpltifunc tstpltifunc.c -L . -ltstpltlib -Wl,-rpath="$(pwd)" $ readelf -rW tstpltifunc | grep -A99 plt Relocation section '.rela.plt' at offset 0x738 contains 8 entries: Offset Info Type Symbol's Value Symbol's Name + Addend 0000000000003f98 0000000300000007 R_X86_64_JUMP_SLOT 0000000000000000 puts@GLIBC_2.2.5 + 0 0000000000003fa8 0000000400000007 R_X86_64_JUMP_SLOT 0000000000000000 __stack_chk_fail@GLIBC_2.4 + 0 0000000000003fb0 0000000500000007 R_X86_64_JUMP_SLOT 0000000000000000 fn1 + 0 0000000000003fb8 0000000600000007 R_X86_64_JUMP_SLOT 0000000000000000 fn3 + 0 0000000000003fc0 0000000800000007 R_X86_64_JUMP_SLOT 0000000000000000 fn4 + 0 0000000000003fc8 0000000900000007 R_X86_64_JUMP_SLOT 0000000000000000 fn2 + 0 0000000000003fd0 0000000b00000007 R_X86_64_JUMP_SLOT 0000000000000000 getrandom@GLIBC_2.25 + 0 0000000000003fa0 0000000000000025 R_X86_64_IRELATIVE 125d $ perf record -e intel_pt//u --filter 'filter main @ ./tstpltifunc' ./tstpltifunc thing2 [ perf record: Woken up 1 times to write data ] [ perf record: Captured and wrote 0.016 MB perf.data ] $ perf script --itrace=be --ns -F+flags,-event,+addr,-period,-comm,-tid,-cpu,-dso 21860.073683659: tr strt 0 [unknown] => 561e212c42be main+0x0 21860.073683659: tr end call 561e212c42c6 main+0x8 => 561e212c4110 fn4@plt+0x0 21860.073683661: tr strt 0 [unknown] => 561e212c42cb main+0xd 21860.073683661: tr end call 561e212c42cb main+0xd => 561e212c40f0 fn1@plt+0x0 21860.073683661: tr strt 0 [unknown] => 561e212c42d0 main+0x12 21860.073683661: tr end call 561e212c42d0 main+0x12 => 561e212c40d0 offset_0x10d0@plt+0x0 21860.073698451: tr strt 0 [unknown] => 561e212c42d5 main+0x17 21860.073698451: tr end call 561e212c42d5 main+0x17 => 561e212c4120 fn2@plt+0x0 21860.073698451: tr strt 0 [unknown] => 561e212c42da main+0x1c 21860.073698451: tr end call 561e212c42da main+0x1c => 561e212c4100 fn3@plt+0x0 21860.073698452: tr strt 0 [unknown] => 561e212c42df main+0x21 21860.073698452: tr end return 561e212c42e5 main+0x27 => 7fb51cc29d90 __libc_start_call_main+0x80 After: $ perf script --itrace=be --ns -F+flags,-event,+addr,-period,-comm,-tid,-cpu,-dso 21860.073683659: tr strt 0 [unknown] => 561e212c42be main+0x0 21860.073683659: tr end call 561e212c42c6 main+0x8 => 561e212c4110 fn4@plt+0x0 21860.073683661: tr strt 0 [unknown] => 561e212c42cb main+0xd 21860.073683661: tr end call 561e212c42cb main+0xd => 561e212c40f0 fn1@plt+0x0 21860.073683661: tr strt 0 [unknown] => 561e212c42d0 main+0x12 21860.073683661: tr end call 561e212c42d0 main+0x12 => 561e212c40d0 thing_ifunc@plt+0x0 21860.073698451: tr strt 0 [unknown] => 561e212c42d5 main+0x17 21860.073698451: tr end call 561e212c42d5 main+0x17 => 561e212c4120 fn2@plt+0x0 21860.073698451: tr strt 0 [unknown] => 561e212c42da main+0x1c 21860.073698451: tr end call 561e212c42da main+0x1c => 561e212c4100 fn3@plt+0x0 21860.073698452: tr strt 0 [unknown] => 561e212c42df main+0x21 21860.073698452: tr end return 561e212c42e5 main+0x27 => 7fb51cc29d90 __libc_start_call_main+0x80 Reviewed-by:
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