- 30 Jun, 2016 4 commits
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Arnaldo Carvalho de Melo authored
RHEL5 for instance doesn't have this one, help it. Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: David Ahern <dsahern@gmail.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Wang Nan <wangnan0@huawei.com> Link: http://lkml.kernel.org/n/tip-3adewnii78zi110eovfciopy@git.kernel.orgSigned-off-by:
Arnaldo Carvalho de Melo <acme@redhat.com>
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Peter Zijlstra (Intel) authored
Staring at annotations of large functions is useless if there's only a few samples in them. Report the number of samples in the header to make this easier to determine. Committer note: The change amounts to: - Percent | Source code & Disassembly of perf-vdso.so for cycles:u ------------------------------------------------------------------ + Percent | Source code & Disassembly of perf-vdso.so for cycles:u (3278 samples) +-------------------------------------------------------------------------------- Signed-off-by:
Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Jiri Olsa <jolsa@kernel.org> Link: http://lkml.kernel.org/r/20160630082955.GA30921@twins.programming.kicks-ass.net [ split from a larger patch ] Signed-off-by:
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Peter Zijlstra (Intel) authored
No need to use strlen, etc to figure that out, just use the return from printf(), it will tell how wide the following line needs to be. Signed-off-by:
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Ravi Bangoria authored
Add Utility function to fetch arch using evsel. (evsel->env->arch) Signed-off-by:
Ravi Bangoria <ravi.bangoria@linux.vnet.ibm.com> Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com> Cc: Anton Blanchard <anton@ozlabs.org> Cc: Daniel Axtens <dja@axtens.net> Cc: David Laight <David.Laight@ACULAB.COM> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com> Link: http://lkml.kernel.org/r/1467267262-4589-2-git-send-email-ravi.bangoria@linux.vnet.ibm.comSigned-off-by:
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- 29 Jun, 2016 3 commits
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Colin Ian King authored
Trivial fix to spelling mistake Signed-off-by:
Colin King <colin.king@canonical.com> Acked-by:
Wang Nan <wangnan0@huawei.com> Cc: Alexei Starovoitov <ast@kernel.org> Cc: He Kuang <hekuang@huawei.com> Cc: Namhyung Kim <namhyung@kernel.org> Link: http://lkml.kernel.org/r/1467116617-8318-1-git-send-email-colin.king@canonical.comSigned-off-by:
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Andi Kleen authored
Add some documentation for the on disk format of perf.data. This is not documenting the actual perf events -- which are documented in perf_event.h -- but just the additional headers that perf record adds around them when writing the data to disk. Signed-off-by:
Andi Kleen <ak@linux.intel.com> Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Jiri Olsa <jolsa@kernel.org> Link: http://lkml.kernel.org/r/1466800885-12974-1-git-send-email-andi@firstfloor.orgSigned-off-by:
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Ingo Molnar authored
Merge tag 'perf-core-for-mingo-20160628' of git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux into perf/core Pull perf/core improvements and fixes from Arnaldo Carvalho de Melo: New features: - Generate comm, fork and exit events when converting perf.data files to CTF (Wang Nan) Infrastructure changes: - Add libbabeltrace to build-test (Wang Nan) - 'perf record' prep work to support multiple evlists (Wang Nan) - Remove unused hist_entry__annotate function (Ravi Bangoria) - Add more toolchain triplets (Ravi Bangoria) - Update message for slang devel packages on Ubuntu (Neeraj Badlani) - Generalize handling of 'ret' instructions in the annotate TUI (Naveen N. Rao) - Use proper dso name for is_regular_file, fixing device file handling (Jiri Olsa) Build Fixes: - Add missing config.h include, fixing the build with libbabeltrace (Jiri Olsa) Signed-off-by:
Ingo Molnar <mingo@kernel.org>
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- 28 Jun, 2016 13 commits
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Wang Nan authored
If 'all' is selected, convert fork and exit events to output CTF stream. Signed-off-by:
Jiri Olsa <jolsa@kernel.org> Cc: Zefan Li <lizefan@huawei.com> Cc: pi3orama@163.com Link: http://lkml.kernel.org/r/1466767332-114472-8-git-send-email-wangnan0@huawei.comSigned-off-by:
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Wang Nan authored
After this patch, 'perf data convert' convert comm events to output CTF stream. Result: # perf record -a sleep 1 [ perf record: Woken up 1 times to write data ] [ perf record: Captured and wrote 0.378 MB perf.data (73 samples) ] # perf data convert --to-ctf ./out.ctf [ perf data convert: Converted 'perf.data' into CTF data './out.ctf' ] [ perf data convert: Converted and wrote 0.003 MB (73 samples) ] # babeltrace --clock-seconds ./out.ctf/ [10627.402515791] (+?.?????????) cycles:ppp: { cpu_id = 0 }, { perf_ip = 0xFFFFFFFF81065AF4, perf_tid = 0, perf_pid = 0, perf_period = 1 } [10627.402518972] (+0.000003181) cycles:ppp: { cpu_id = 0 }, { perf_ip = 0xFFFFFFFF81065AF4, perf_tid = 0, perf_pid = 0, perf_period = 1 } ... // only sample event is converted # perf data convert --all --to-ctf ./out.ctf [ perf data convert: Converted 'perf.data' into CTF data './out.ctf' ] [ perf data convert: Converted and wrote 0.023 MB (73 samples, 384 non-samples) ] # babeltrace --clock-seconds ./out.ctf/ [ 0.000000000] (+?.?????????) perf_comm: { cpu_id = 0 }, { pid = 1, tid = 1, comm = "init" } [ 0.000000000] (+0.000000000) perf_comm: { cpu_id = 0 }, { pid = 2, tid = 2, comm = "kthreadd" } [ 0.000000000] (+0.000000000) perf_comm: { cpu_id = 0 }, { pid = 3, tid = 3, comm = "ksoftirqd/0" } ... // comm events are converted [10627.402515791] (+10627.402515791) cycles:ppp: { cpu_id = 0 }, { perf_ip = 0xFFFFFFFF81065AF4, perf_tid = 0, perf_pid = 0, perf_period = 1 } [10627.402518972] (+0.000003181) cycles:ppp: { cpu_id = 0 }, { perf_ip = 0xFFFFFFFF81065AF4, perf_tid = 0, perf_pid = 0, perf_period = 1 } ... // samples are also converted Signed-off-by: -
Wang Nan authored
If 'all' is selected, convert comm event to output CTF stream. setup_non_sample_events() is called if non_sample is selected. It creates a comm_class for comm event. Use macros to generate and process_comm_event and add_comm_event. These macros can be reused for other non-sample events. Signed-off-by:
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Wang Nan authored
Following commits are going to allow 'perf data convert' to collect not only samples, but also non-sample events like comm and fork. In this patch we count non-sample events using c.non_sample_count, and prepare to print number of both type of events like: # ~/perf data convert --all --to-ctf ./out.ctf [ perf data convert: Converted 'perf.data' into CTF data './out.ctf' ] [ perf data convert: Converted and wrote 0.846 MB (6508 samples, 686 non-samples) ] Signed-off-by:
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Wang Nan authored
If 'all' option is selected, 'perf data convert' should convert not only samples, but non-sample events such as comm and fork. Add this option in perf_data_convert_opts. Following commits will add cmdline option to select it. Signed-off-by:
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Wang Nan authored
Following commits will add new option to 'perf data convert'. All options should be grouped into a structure and passed to low level converter (currently there's only one converter). Introduce data-convert.h and define 'struct perf_data_convert_opts' in it. Pass 'force' through opts. Signed-off-by:
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Wang Nan authored
There are many value_set_##x helper for integer, but only for integer. This patch adds value_set_string() helper to help following commits create string fields. Signed-off-by:
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Jiri Olsa authored
Marc reported use of uninitialized memory: > In commit "40356721 perf symbols: Do not read symbols/data from > device files" a check to uninitialzied memory was added. This leads to > the following valgrind output: > > ==24515== Syscall param stat(file_name) points to uninitialised byte(s) > ==24515== at 0x75B26D5: _xstat (in /lib/x86_64-linux-gnu/libc-2.22.so) > ==24515== by 0x4E548D: stat (stat.h:454) > ==24515== by 0x4E548D: is_regular_file (util.c:687) > ==24515== by 0x4A5BEE: dso__load (symbol.c:1435) > ==24515== by 0x4BB1AE: map__load (map.c:289) > ==24515== by 0x4BB1AE: map__find_symbol (map.c:333) > ==24515== by 0x4835B3: thread__find_addr_location (event.c:1300) > ==24515== by 0x4B5342: add_callchain_ip (machine.c:1652) > ==24515== by 0x4B5342: thread__resolve_callchain_sample (machine.c:1906) > ==24515== by 0x4B9E7D: thread__resolve_callchain (machine.c:1958) > ==24515== by 0x441B3E: process_event (builtin-script.c:795) > ==24515== by 0x441B3E: process_sample_event (builtin-script.c:920) > ==24515== by 0x4BEE29: perf_evlist__deliver_sample (session.c:1192) > ==24515== by 0x4BEE29: machines__deliver_event (session.c:1229) > ==24515== by 0x4BF770: perf_session__deliver_event (session.c:1286) > ==24515== by 0x4BF770: ordered_events__deliver_event (session.c:114) > ==24515== by 0x4C1D17: __ordered_events__flush (ordered-events.c:207) > ==24515== by 0x4C1D17: ordered_events__flush.part.3 (ordered-events.c:274) > ==24515== by 0x4BF44C: perf_session__process_user_event (session.c:1325) > ==24515== by 0x4BF44C: perf_session__process_event (session.c:1451) > ==24515== Address 0x807c6a0 is 0 bytes inside a block of size 4,096 alloc'd > ==24515== at 0x4C29C0F: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so) > ==24515== by 0x4A5BCB: dso__load (symbol.c:1421) > ==24515== by 0x4BB1AE: map__load (map.c:289) > ==24515== by 0x4BB1AE: map__find_symbol (map.c:333) > ==24515== by 0x4835B3: thread__find_addr_location (event.c:1300) > ==24515== by 0x4B5342: add_callchain_ip (machine.c:1652) > ==24515== by 0x4B5342: thread__resolve_callchain_sample (machine.c:1906) > ==24515== by 0x4B9E7D: thread__resolve_callchain (machine.c:1958) > ==24515== by 0x441B3E: process_event (builtin-script.c:795) > ==24515== by 0x441B3E: process_sample_event (builtin-script.c:920) > ==24515== by 0x4BEE29: perf_evlist__deliver_sample (session.c:1192) > ==24515== by 0x4BEE29: machines__deliver_event (session.c:1229) > ==24515== by 0x4BF770: perf_session__deliver_event (session.c:1286) > ==24515== by 0x4BF770: ordered_events__deliver_event (session.c:114) > ==24515== by 0x4C1D17: __ordered_events__flush (ordered-events.c:207) > ==24515== by 0x4C1D17: ordered_events__flush.part.3 (ordered-events.c:274) > ==24515== by 0x4BF44C: perf_session__process_user_event (session.c:1325) > ==24515== by 0x4BF44C: perf_session__process_event (session.c:1451) > ==24515== by 0x4C0EAC: __perf_session__process_events (session.c:1804) > ==24515== by 0x4C0EAC: perf_session__process_events (session.c:1858) The reason was a typo that passed global 'name' variable as the is_regular_file argument instead dso->long_name. Reported-by:
Marc Kleine-Budde <mkl@pengutronix.de> Signed-off-by:
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Wang Nan authored
Following commits introduce new evlists to record. This patch adjusts record__pick_pc() and introduces perf_evlist__pick_pc() to read control page from one specific evlist. record__pick_pc() will be improved to search control page from multiple evlists. Signed-off-by:
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Wang Nan authored
Following commits introduce new evlists to record. This patch adjusts record__mmap_read_all() and record__mmap_read(): converting original record__mmap_read_all() to record__mmap_read_evlist(), read from one evlist; makes record__mmap_read() reading from specific evlist. record__mmap_read_all() will be improved to read from multiple evlists. Signed-off-by:
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Wang Nan authored
Following commits introduce multiple evlists to record. This patch extracts perf_evlist__mmap_ex() processing to a new function, creates record__mmap() and record__mmap_evlist() to wrap perf_evlist__mmap_ex() and its error processing. They will be improvemented to create mmap for all evlists. Signed-off-by:
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Jiri Olsa authored
Otherwise some compiler might scream: $ make LIBBABELTRACE_DIR=/opt/libbabeltrace/ LIBBABELTRACE=1 BUILD: Doing 'make -j4' parallel build CC util/data-convert-bt.o util/data-convert-bt.c: In function ‘convert__config’: util/data-convert-bt.c:1299:19: error: implicit declaration of function ‘perf_config_u64’ [-Werror=implicit-function-declaration] c->queue_size = perf_config_u64(var, value); ... Signed-off-by: -
Wang Nan authored
'make build-test' doesn't test LIBBABELTRACE=1. It misses a building failure caused by commit 41840d21 ("perf config: Move config declarations from util/cache.h to util/config.h"), breaks bisect. Add LIBBABELTRACE=1 to build-test. Signed-off-by:
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- 27 Jun, 2016 11 commits
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Ravi Bangoria authored
Add few more triplets based on Fedora and Ubuntu binutils (cross tools). Before applying patch on x86: ( Install binutils-powerpc64-linux-gnu.x86_64 ) $ perf report -i perf.data.powerpc --vmlinux vmlinux.powerpc \ --objdump powerpc64-linux-gnu-objdump After applying patch on x86: $ perf report -i perf.data.powerpc --vmlinux vmlinux.powerpc I.e. it will find the right objdump from the environment data recorded in the perf.data file + these triplets. Signed-off-by: -
Naveen N. Rao authored
Introduce helper to detect 'ret' instructions and use the same in the TUI. A helper is needed since some architectures such as powerpc have more than one return instruction. Signed-off-by:
Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com> Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com> Cc: Anton Blanchard <anton@ozlabs.org> Cc: Daniel Axtens <dja@axtens.net> Cc: Michael Ellerman <mpe@ellerman.id.au> Link: http://lkml.kernel.org/r/1466769240-12376-5-git-send-email-ravi.bangoria@linux.vnet.ibm.comSigned-off-by:
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Neeraj Badlani authored
In case of missing library (libslang), give hint to install library (libslang2-dev), since libslang-dev is not provided by Ubuntu. Signed-off-by:
Neeraj Badlani <neerajbadlani@gmail.com> Link: http://lkml.kernel.org/r/1467035997-9100-1-git-send-email-neerajbadlani@gmail.com [ removed excessive 'or' usage ] Signed-off-by:
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Ravi Bangoria authored
hist_entry__annotate looks part of API but I don't find any caller of this function. Removing it. Signed-off-by:
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Peter Zijlstra authored
The whole rdmsr()/wrmsr() for lbr_from got a little unweildy with the sign extension quirk, provide a few simple wrappers to clean things up. Signed-off-by:
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David Carrillo-Cisneros authored
Add quirk for context switch to save/restore the value of MSR_LAST_BRANCH_FROM_x when LBR is enabled and there is potential for kernel addresses to be in the lbr_from register. To test this patch, use a perf tool and kernel with the patch next in this series. That patch removes the work around that masked the hw bug: $ ./lbr_perf record --call-graph lbr -e cycles:k sleep 1 where lbr_perf is the patched perf tool, that allows to specify :k on lbr mode. The above command will trigger a #GPF : WARNING: CPU: 28 PID: 14096 at arch/x86/mm/extable.c:65 ex_handler_wrmsr_unsafe+0x70/0x80 unchecked MSR access error: WRMSR to 0x681 (tried to write 0x1fffffff81010794) ... Call Trace: [<ffffffff8167af49>] dump_stack+0x4d/0x63 [<ffffffff810b9b15>] __warn+0xe5/0x100 [<ffffffff810b9be9>] warn_slowpath_fmt+0x49/0x50 [<ffffffff810abb40>] ex_handler_wrmsr_unsafe+0x70/0x80 [<ffffffff810abc42>] fixup_exception+0x42/0x50 [<ffffffff81079d1a>] do_general_protection+0x8a/0x160 [<ffffffff81684ec2>] general_protection+0x22/0x30 [<ffffffff810101b9>] ? intel_pmu_lbr_sched_task+0xc9/0x380 [<ffffffff81009d7c>] intel_pmu_sched_task+0x3c/0x60 [<ffffffff81003a2b>] x86_pmu_sched_task+0x1b/0x20 [<ffffffff81192a5b>] perf_pmu_sched_task+0x6b/0xb0 [<ffffffff8119746d>] __perf_event_task_sched_in+0x7d/0x150 [<ffffffff810dd9dc>] finish_task_switch+0x15c/0x200 [<ffffffff8167f894>] __schedule+0x274/0x6cc [<ffffffff8167fdd9>] schedule+0x39/0x90 [<ffffffff81675398>] exit_to_usermode_loop+0x39/0x89 [<ffffffff810028ce>] prepare_exit_to_usermode+0x2e/0x30 [<ffffffff81683c1b>] retint_user+0x8/0x10 Signed-off-by:
David Carrillo-Cisneros <davidcc@google.com> Signed-off-by:
Stephane Eranian <eranian@google.com> Reviewed-by:
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David Carrillo-Cisneros authored
Replace spaces by tabs in LBR_FROM_* constants to align with newly defined constant. Use BIT_ULL. Signed-off-by:
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David Carrillo-Cisneros authored
Intel's SDM states that bits 61:62 in MSR_LAST_BRANCH_FROM_x are the TSX flags for formats with LBR_TSX flags (i.e. LBR_FORMAT_EIP_EFLAGS2). However, when the CPU has TSX support deactivated, bits 61:62 actually behave as follows: - For wrmsr(), bits 61:62 are considered part of the sign extension. - When capturing branches, the LBR hw will always clear bits 61:62. regardless of the sign extension. Therefore, if: 1) LBR has TSX format. 2) CPU has no TSX support enabled. ... then any value passed to wrmsr() must be sign extended to 63 bits and any value from rdmsr() must be converted to have a sign extension of 61 bits, ignoring the values at TSX flags. This bug was masked by the work-around to the Intel's CPU bug: BJ94. "LBR May Contain Incorrect Information When Using FREEZE_LBRS_ON_PMI" in Document Number: 324643-037US. The aforementioned work-around uses hw flags to filter out all kernel branches, limiting LBR callstack to user level execution only. Since user addresses are not sign extended, they do not trigger the wrmsr() bug in MSR_LAST_BRANCH_FROM_x when saved/restored at context switch. To verify the hw bug: $ perf record -b -e cycles sleep 1 $ rdmsr -p 0 0x680 0x1fffffffb0b9b0cc $ wrmsr -p 0 0x680 0x1fffffffb0b9b0cc write(): Input/output error The quirk for LBR_FROM_ MSRs is required before calls to wrmsrl() and after rdmsrl(). This patch introduces it for wrmsrl()'s done for testing LBR support. Future patch in series adds the quirk for context switch, that would be required if LBR callstack is to be enabled for ring 0. Signed-off-by: -
David Carrillo-Cisneros authored
The following commit: 338b522c ("perf/x86/intel: Protect LBR and extra_regs against KVM lying") added an additional test to LBR support detection that is performed after printing the LBR support statement to dmesg. Move the LBR support output after the very last test, to make sure we print the true status of LBR support. Signed-off-by:
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Ingo Molnar authored
Signed-off-by: -
Linus Torvalds authored
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- 26 Jun, 2016 2 commits
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git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsiLinus Torvalds authored
Pull SCSI fixes from James Bottomley: "Two straightforward fixes. One is a concurrency issue only affecting SAS connected SATA drives, but which could hang the storage subsystem if it triggers (because the outstanding command count on error never goes back to zero) and the other is a NO_TAG fallout from the switch to hostwide tags which causes the system to crash on module insertion (we've checked carefully and only the 53c700 family of drivers is vulnerable to this issue)" * tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi: 53c700: fix BUG on untagged commands scsi: fix race between simultaneous decrements of ->host_failed
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Ingo Molnar authored
Merge tag 'perf-core-for-mingo-20160623' of git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux into perf/core Pull perf/core improvements and fixes from Arnaldo Carvalho de Melo: New features: - Add 'callindent' option to 'perf script -F', to indent the Intel PT call stack, making this output more ftrace-like (Adrian Hunter, Andi Kleen) User visible changes: - Enlarge 'pid' column width, to cope with large pids (Jiri Olsa) Infrastructure changes: - Fix cross platform unwind (He Kuang) - Make destructors accept NULL, behaving like free() (Arnaldo Carvalho de Melo) - Remove reference to perl interpreted in the recently added 'perf script' stackcollapse python script (Arnaldo Carvalho de Melo) - Rename CLASS__for_each() macros to CLASS__for_each_entry(), to use the list_for_each_entry() semantics, as most of these class specific loop helpers are list_for_each_entry*() wrappers (Arnaldo Carvalho de Melo) - Expose the hist_browser code, will be used with data structures other than perf_evsel (Jiri Olsa) - Refactor 'perf config' (Taeung Song) Signed-off-by:
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- 25 Jun, 2016 7 commits
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Linus Torvalds authored
Merge branch 'for-linus-4.7-part2' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs Pull btrfs fixes part 2 from Chris Mason: "This has one patch from Omar to bring iterate_shared back to btrfs. We have a tree of work we queue up for directory items and it doesn't lend itself well to shared access. While we're cleaning it up, Omar has changed things to use an exclusive lock when there are delayed items" * 'for-linus-4.7-part2' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs: Btrfs: fix ->iterate_shared() by upgrading i_rwsem for delayed nodes
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git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfsLinus Torvalds authored
Pull btrfs fixes from Chris Mason: "I have a two part pull this time because one of the patches Dave Sterba collected needed to be against v4.7-rc2 or higher (we used rc4). I try to make my for-linus-xx branch testable on top of the last major so we can hand fixes to people on the list more easily, so I've split this pull in two. This first part has some fixes and two performance improvements that we've been testing for some time. Josef's two performance fixes are most notable. The transid tracking patch makes a big improvement on pretty much every workload" * 'for-linus-4.7' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs: Btrfs: Force stripesize to the value of sectorsize btrfs: fix disk_i_size update bug when fallocate() fails Btrfs: fix error handling in map_private_extent_buffer Btrfs: fix error return code in btrfs_init_test_fs() Btrfs: don't do nocow check unless we have to btrfs: fix deadlock in delayed_ref_async_start Btrfs: track transid for delayed ref flushing
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git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/soundLinus Torvalds authored
Pull sound fixes from Takashi Iwai: "Again pretty calm weeks: we've had only a few trivial / stable HD-audio fixes in addition to a possible race fix for snd-dummy driver spotted by syzkaller" * tag 'sound-4.7-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound: ALSA: dummy: Fix a use-after-free at closing ALSA: hda / realtek - add two more Thinkpad IDs (5050,5053) for tpt460 fixup ALSA: hda - Fix the headset mic jack detection on Dell machine ALSA: hda/tegra: iomem fixups for sparse warnings ALSA: hdac_regmap - fix the register access for runtime PM
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tipLinus Torvalds authored
Pull x86 kprobe fix from Thomas Gleixner: "A single fix clearing the TF bit when a fault is single stepped" * 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: kprobes/x86: Clear TF bit in fault on single-stepping
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tipLinus Torvalds authored
Pull scheduler fixes from Thomas Gleixner: "A couple of scheduler fixes: - force watchdog reset while processing sysrq-w - fix a deadlock when enabling trace events in the scheduler - fixes to the throttled next buddy logic - fixes for the average accounting (missing serialization and underflow handling) - allow kernel threads for fallback to online but not active cpus" * 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: sched/core: Allow kthreads to fall back to online && !active cpus sched/fair: Do not announce throttled next buddy in dequeue_task_fair() sched/fair: Initialize throttle_count for new task-groups lazily sched/fair: Fix cfs_rq avg tracking underflow kernel/sysrq, watchdog, sched/core: Reset watchdog on all CPUs while processing sysrq-w sched/debug: Fix deadlock when enabling sched events sched/fair: Fix post_init_entity_util_avg() serialization -
Omar Sandoval authored
Commit fe742fd4 ("Revert "btrfs: switch to ->iterate_shared()"") backed out the conversion to ->iterate_shared() for Btrfs because the delayed inode handling in btrfs_real_readdir() is racy. However, we can still do readdir in parallel if there are no delayed nodes. This is a temporary fix which upgrades the shared inode lock to an exclusive lock only when we have delayed items until we come up with a more complete solution. While we're here, rename the btrfs_{get,put}_delayed_items functions to make it very clear that they're just for readdir. Tested with xfstests and by doing a parallel kernel build: while make tinyconfig && make -j4 && git clean dqfx; do : done along with a bunch of parallel finds in another shell: while true; do for ((i=0; i<4; i++)); do find . >/dev/null & done wait done Signed-off-by:
Omar Sandoval <osandov@fb.com> Signed-off-by:
David Sterba <dsterba@suse.com> Signed-off-by:
Chris Mason <clm@fb.com>
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tipLinus Torvalds authored
Pull locking fix from Thomas Gleixner: "A single fix to address a race in the static key logic" * 'locking-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: locking/static_key: Fix concurrent static_key_slow_inc()
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