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Commit 78e6c39b authored by Hemant Kumar's avatar Hemant Kumar Committed by Arnaldo Carvalho de Melo
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perf kvm/powerpc: Add support for HCALL reasons 

Powerpc provides hcall events that also provides insights into guest
behaviour. Enhance perf kvm stat to record and analyze hcall events.

 - To trace hcall events :
  perf kvm stat record

 - To show the results :
  perf kvm stat report --event=hcall

The result shows the number of hypervisor calls from the guest grouped
by their respective reasons displayed with the frequency.

This patch makes use of two additional tracepoints
"kvm_hv:kvm_hcall_enter" and "kvm_hv:kvm_hcall_exit". To map the hcall
codes to their respective names, it needs a mapping. Such mapping is
added in this patch in book3s_hcalls.h.

 # pgrep qemu
A sample output :
19378
60515

2 VMs running.

 # perf kvm stat record -a
^C[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 4.153 MB perf.data.guest (39624
samples) ]

 # perf kvm stat report -p 60515 --event=hcall

Analyze events for all VMs, all VCPUs:

    HCALL-EVENT Samples Samples% Time% MinTime MaxTime  AvgTime

          H_IPI     822  66.08% 88.10% 0.63us  11.38us 2.05us (+- 1.42%)
     H_SEND_CRQ     144  11.58%  3.77% 0.41us   0.88us 0.50us (+- 1.47%)
   H_VIO_SIGNAL     118   9.49%  2.86% 0.37us   0.83us 0.47us (+- 1.43%)
H_PUT_TERM_CHAR      76   6.11%  2.07% 0.37us   0.90us 0.52us (+- 2.43%)
H_GET_TERM_CHAR      74   5.95%  2.23% 0.37us   1.70us 0.58us (+- 4.77%)
         H_RTAS       6   0.48%  0.85% 1.10us   9.25us 2.70us (+-48.57%)
      H_PERFMON       4   0.32%  0.12% 0.41us   0.96us 0.59us (+-20.92%)

Total Samples:1244, Total events handled time:1916.69us.
Signed-off-by: default avatarHemant Kumar <hemant@linux.vnet.ibm.com>
Cc: Alexander Yarygin <yarygin@linux.vnet.ibm.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Scott  Wood <scottwood@freescale.com>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: linuxppc-dev@lists.ozlabs.org
Link: http://lkml.kernel.org/r/1453962787-15376-4-git-send-email-hemant@linux.vnet.ibm.comSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent 066d3593
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Showing with 187 additions and 1 deletion
tools/perf/arch/powerpc/util/book3s_hcalls.h 0 → 100644
View file @ 78e6c39b
#ifndef ARCH_PERF_BOOK3S_HV_HCALLS_H
#define ARCH_PERF_BOOK3S_HV_HCALLS_H
/*
* PowerPC HCALL codes : hcall code to name mapping
*/
#define kvm_trace_symbol_hcall \
{0x4, "H_REMOVE"}, \
{0x8, "H_ENTER"}, \
{0xc, "H_READ"}, \
{0x10, "H_CLEAR_MOD"}, \
{0x14, "H_CLEAR_REF"}, \
{0x18, "H_PROTECT"}, \
{0x1c, "H_GET_TCE"}, \
{0x20, "H_PUT_TCE"}, \
{0x24, "H_SET_SPRG0"}, \
{0x28, "H_SET_DABR"}, \
{0x2c, "H_PAGE_INIT"}, \
{0x30, "H_SET_ASR"}, \
{0x34, "H_ASR_ON"}, \
{0x38, "H_ASR_OFF"}, \
{0x3c, "H_LOGICAL_CI_LOAD"}, \
{0x40, "H_LOGICAL_CI_STORE"}, \
{0x44, "H_LOGICAL_CACHE_LOAD"}, \
{0x48, "H_LOGICAL_CACHE_STORE"}, \
{0x4c, "H_LOGICAL_ICBI"}, \
{0x50, "H_LOGICAL_DCBF"}, \
{0x54, "H_GET_TERM_CHAR"}, \
{0x58, "H_PUT_TERM_CHAR"}, \
{0x5c, "H_REAL_TO_LOGICAL"}, \
{0x60, "H_HYPERVISOR_DATA"}, \
{0x64, "H_EOI"}, \
{0x68, "H_CPPR"}, \
{0x6c, "H_IPI"}, \
{0x70, "H_IPOLL"}, \
{0x74, "H_XIRR"}, \
{0x78, "H_MIGRATE_DMA"}, \
{0x7c, "H_PERFMON"}, \
{0xdc, "H_REGISTER_VPA"}, \
{0xe0, "H_CEDE"}, \
{0xe4, "H_CONFER"}, \
{0xe8, "H_PROD"}, \
{0xec, "H_GET_PPP"}, \
{0xf0, "H_SET_PPP"}, \
{0xf4, "H_PURR"}, \
{0xf8, "H_PIC"}, \
{0xfc, "H_REG_CRQ"}, \
{0x100, "H_FREE_CRQ"}, \
{0x104, "H_VIO_SIGNAL"}, \
{0x108, "H_SEND_CRQ"}, \
{0x110, "H_COPY_RDMA"}, \
{0x114, "H_REGISTER_LOGICAL_LAN"}, \
{0x118, "H_FREE_LOGICAL_LAN"}, \
{0x11c, "H_ADD_LOGICAL_LAN_BUFFER"}, \
{0x120, "H_SEND_LOGICAL_LAN"}, \
{0x124, "H_BULK_REMOVE"}, \
{0x130, "H_MULTICAST_CTRL"}, \
{0x134, "H_SET_XDABR"}, \
{0x138, "H_STUFF_TCE"}, \
{0x13c, "H_PUT_TCE_INDIRECT"}, \
{0x14c, "H_CHANGE_LOGICAL_LAN_MAC"}, \
{0x150, "H_VTERM_PARTNER_INFO"}, \
{0x154, "H_REGISTER_VTERM"}, \
{0x158, "H_FREE_VTERM"}, \
{0x15c, "H_RESET_EVENTS"}, \
{0x160, "H_ALLOC_RESOURCE"}, \
{0x164, "H_FREE_RESOURCE"}, \
{0x168, "H_MODIFY_QP"}, \
{0x16c, "H_QUERY_QP"}, \
{0x170, "H_REREGISTER_PMR"}, \
{0x174, "H_REGISTER_SMR"}, \
{0x178, "H_QUERY_MR"}, \
{0x17c, "H_QUERY_MW"}, \
{0x180, "H_QUERY_HCA"}, \
{0x184, "H_QUERY_PORT"}, \
{0x188, "H_MODIFY_PORT"}, \
{0x18c, "H_DEFINE_AQP1"}, \
{0x190, "H_GET_TRACE_BUFFER"}, \
{0x194, "H_DEFINE_AQP0"}, \
{0x198, "H_RESIZE_MR"}, \
{0x19c, "H_ATTACH_MCQP"}, \
{0x1a0, "H_DETACH_MCQP"}, \
{0x1a4, "H_CREATE_RPT"}, \
{0x1a8, "H_REMOVE_RPT"}, \
{0x1ac, "H_REGISTER_RPAGES"}, \
{0x1b0, "H_DISABLE_AND_GETC"}, \
{0x1b4, "H_ERROR_DATA"}, \
{0x1b8, "H_GET_HCA_INFO"}, \
{0x1bc, "H_GET_PERF_COUNT"}, \
{0x1c0, "H_MANAGE_TRACE"}, \
{0x1d4, "H_FREE_LOGICAL_LAN_BUFFER"}, \
{0x1d8, "H_POLL_PENDING"}, \
{0x1e4, "H_QUERY_INT_STATE"}, \
{0x244, "H_ILLAN_ATTRIBUTES"}, \
{0x250, "H_MODIFY_HEA_QP"}, \
{0x254, "H_QUERY_HEA_QP"}, \
{0x258, "H_QUERY_HEA"}, \
{0x25c, "H_QUERY_HEA_PORT"}, \
{0x260, "H_MODIFY_HEA_PORT"}, \
{0x264, "H_REG_BCMC"}, \
{0x268, "H_DEREG_BCMC"}, \
{0x26c, "H_REGISTER_HEA_RPAGES"}, \
{0x270, "H_DISABLE_AND_GET_HEA"}, \
{0x274, "H_GET_HEA_INFO"}, \
{0x278, "H_ALLOC_HEA_RESOURCE"}, \
{0x284, "H_ADD_CONN"}, \
{0x288, "H_DEL_CONN"}, \
{0x298, "H_JOIN"}, \
{0x2a4, "H_VASI_STATE"}, \
{0x2b0, "H_ENABLE_CRQ"}, \
{0x2b8, "H_GET_EM_PARMS"}, \
{0x2d0, "H_SET_MPP"}, \
{0x2d4, "H_GET_MPP"}, \
{0x2ec, "H_HOME_NODE_ASSOCIATIVITY"}, \
{0x2f4, "H_BEST_ENERGY"}, \
{0x2fc, "H_XIRR_X"}, \
{0x300, "H_RANDOM"}, \
{0x304, "H_COP"}, \
{0x314, "H_GET_MPP_X"}, \
{0x31c, "H_SET_MODE"}, \
{0xf000, "H_RTAS"} \
#endif
tools/perf/arch/powerpc/util/kvm-stat.c
View file @ 78e6c39b
#include "util/kvm-stat.h" #include "util/kvm-stat.h"
#include "util/parse-events.h" #include "util/parse-events.h"
#include "util/debug.h"
#include "book3s_hv_exits.h" #include "book3s_hv_exits.h"
#include "book3s_hcalls.h"
#define NR_TPS 2 #define NR_TPS 4
const char *vcpu_id_str = "vcpu_id"; const char *vcpu_id_str = "vcpu_id";
const int decode_str_len = 40; const int decode_str_len = 40;
...@@ -11,17 +13,77 @@ const char *kvm_entry_trace = "kvm_hv:kvm_guest_enter"; ...@@ -11,17 +13,77 @@ const char *kvm_entry_trace = "kvm_hv:kvm_guest_enter";
const char *kvm_exit_trace = "kvm_hv:kvm_guest_exit"; const char *kvm_exit_trace = "kvm_hv:kvm_guest_exit";
define_exit_reasons_table(hv_exit_reasons, kvm_trace_symbol_exit); define_exit_reasons_table(hv_exit_reasons, kvm_trace_symbol_exit);
define_exit_reasons_table(hcall_reasons, kvm_trace_symbol_hcall);
/* Tracepoints specific to ppc_book3s_hv */ /* Tracepoints specific to ppc_book3s_hv */
const char *ppc_book3s_hv_kvm_tp[] = { const char *ppc_book3s_hv_kvm_tp[] = {
"kvm_hv:kvm_guest_enter", "kvm_hv:kvm_guest_enter",
"kvm_hv:kvm_guest_exit", "kvm_hv:kvm_guest_exit",
"kvm_hv:kvm_hcall_enter",
"kvm_hv:kvm_hcall_exit",
NULL,
}; };
/* 1 extra placeholder for NULL */ /* 1 extra placeholder for NULL */
const char *kvm_events_tp[NR_TPS + 1]; const char *kvm_events_tp[NR_TPS + 1];
const char *kvm_exit_reason; const char *kvm_exit_reason;
static void hcall_event_get_key(struct perf_evsel *evsel,
struct perf_sample *sample,
struct event_key *key)
{
key->info = 0;
key->key = perf_evsel__intval(evsel, sample, "req");
}
static const char *get_hcall_exit_reason(u64 exit_code)
{
struct exit_reasons_table *tbl = hcall_reasons;
while (tbl->reason != NULL) {
if (tbl->exit_code == exit_code)
return tbl->reason;
tbl++;
}
pr_debug("Unknown hcall code: %lld\n",
(unsigned long long)exit_code);
return "UNKNOWN";
}
static bool hcall_event_end(struct perf_evsel *evsel,
struct perf_sample *sample __maybe_unused,
struct event_key *key __maybe_unused)
{
return (!strcmp(evsel->name, kvm_events_tp[3]));
}
static bool hcall_event_begin(struct perf_evsel *evsel,
struct perf_sample *sample, struct event_key *key)
{
if (!strcmp(evsel->name, kvm_events_tp[2])) {
hcall_event_get_key(evsel, sample, key);
return true;
}
return false;
}
static void hcall_event_decode_key(struct perf_kvm_stat *kvm __maybe_unused,
struct event_key *key,
char *decode)
{
const char *hcall_reason = get_hcall_exit_reason(key->key);
scnprintf(decode, decode_str_len, "%s", hcall_reason);
}
static struct kvm_events_ops hcall_events = {
.is_begin_event = hcall_event_begin,
.is_end_event = hcall_event_end,
.decode_key = hcall_event_decode_key,
.name = "HCALL-EVENT",
};
static struct kvm_events_ops exit_events = { static struct kvm_events_ops exit_events = {
.is_begin_event = exit_event_begin, .is_begin_event = exit_event_begin,
.is_end_event = exit_event_end, .is_end_event = exit_event_end,
...@@ -31,6 +93,7 @@ static struct kvm_events_ops exit_events = { ...@@ -31,6 +93,7 @@ static struct kvm_events_ops exit_events = {
struct kvm_reg_events_ops kvm_reg_events_ops[] = { struct kvm_reg_events_ops kvm_reg_events_ops[] = {
{ .name = "vmexit", .ops = &exit_events }, { .name = "vmexit", .ops = &exit_events },
{ .name = "hcall", .ops = &hcall_events },
{ NULL, NULL }, { NULL, NULL },
}; };
......
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