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perf_event: Add alignment-faults and emulation-faults software events

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Add two more software events that are common to many cpus.

Alignment faults: When a load or store is not aligned properly.

Emulation faults: When an instruction is emulated in software.

Both cause a very significant slowdown (100x or worse), so identifying and
fixing them is very important.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Anton Blanchard 2009-10-18 01:09:29 +00:00 committed by Paul Mackerras
parent 81cd5ae303
commit f7d7986060
5 changed files with 12 additions and 0 deletions
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2
include/linux/perf_counter.h
View file

@ -106,6 +106,8 @@ enum perf_sw_ids {
PERF_COUNT_SW_CPU_MIGRATIONS = 4, PERF_COUNT_SW_CPU_MIGRATIONS = 4,
PERF_COUNT_SW_PAGE_FAULTS_MIN = 5, PERF_COUNT_SW_PAGE_FAULTS_MIN = 5,
PERF_COUNT_SW_PAGE_FAULTS_MAJ = 6, PERF_COUNT_SW_PAGE_FAULTS_MAJ = 6,
PERF_COUNT_SW_ALIGNMENT_FAULTS = 7,
PERF_COUNT_SW_EMULATION_FAULTS = 8,
PERF_COUNT_SW_MAX, /* non-ABI */ PERF_COUNT_SW_MAX, /* non-ABI */
}; };

2
include/linux/perf_event.h
View file

@ -102,6 +102,8 @@ enum perf_sw_ids {
PERF_COUNT_SW_CPU_MIGRATIONS = 4, PERF_COUNT_SW_CPU_MIGRATIONS = 4,
PERF_COUNT_SW_PAGE_FAULTS_MIN = 5, PERF_COUNT_SW_PAGE_FAULTS_MIN = 5,
PERF_COUNT_SW_PAGE_FAULTS_MAJ = 6, PERF_COUNT_SW_PAGE_FAULTS_MAJ = 6,
PERF_COUNT_SW_ALIGNMENT_FAULTS = 7,
PERF_COUNT_SW_EMULATION_FAULTS = 8,
PERF_COUNT_SW_MAX, /* non-ABI */ PERF_COUNT_SW_MAX, /* non-ABI */
}; };

2
kernel/perf_event.c
View file

@ -4186,6 +4186,8 @@ static const struct pmu *sw_perf_event_init(struct perf_event *event)
case PERF_COUNT_SW_PAGE_FAULTS_MAJ: case PERF_COUNT_SW_PAGE_FAULTS_MAJ:
case PERF_COUNT_SW_CONTEXT_SWITCHES: case PERF_COUNT_SW_CONTEXT_SWITCHES:
case PERF_COUNT_SW_CPU_MIGRATIONS: case PERF_COUNT_SW_CPU_MIGRATIONS:
case PERF_COUNT_SW_ALIGNMENT_FAULTS:
case PERF_COUNT_SW_EMULATION_FAULTS:
if (!event->parent) { if (!event->parent) {
atomic_inc(&perf_swevent_enabled[event_id]); atomic_inc(&perf_swevent_enabled[event_id]);
event->destroy = sw_perf_event_destroy; event->destroy = sw_perf_event_destroy;

2
tools/perf/design.txt
View file

@ -137,6 +137,8 @@ enum sw_event_ids {
PERF_COUNT_SW_CPU_MIGRATIONS = 4, PERF_COUNT_SW_CPU_MIGRATIONS = 4,
PERF_COUNT_SW_PAGE_FAULTS_MIN = 5, PERF_COUNT_SW_PAGE_FAULTS_MIN = 5,
PERF_COUNT_SW_PAGE_FAULTS_MAJ = 6, PERF_COUNT_SW_PAGE_FAULTS_MAJ = 6,
PERF_COUNT_SW_ALIGNMENT_FAULTS = 7,
PERF_COUNT_SW_EMULATION_FAULTS = 8,
}; };
Counters of the type PERF_TYPE_TRACEPOINT are available when the ftrace event Counters of the type PERF_TYPE_TRACEPOINT are available when the ftrace event

4
tools/perf/util/parse-events.c
View file

@ -46,6 +46,8 @@ static struct event_symbol event_symbols[] = {
{ CSW(PAGE_FAULTS_MAJ), "major-faults", "" }, { CSW(PAGE_FAULTS_MAJ), "major-faults", "" },
{ CSW(CONTEXT_SWITCHES), "context-switches", "cs" }, { CSW(CONTEXT_SWITCHES), "context-switches", "cs" },
{ CSW(CPU_MIGRATIONS), "cpu-migrations", "migrations" }, { CSW(CPU_MIGRATIONS), "cpu-migrations", "migrations" },
{ CSW(ALIGNMENT_FAULTS), "alignment-faults", "" },
{ CSW(EMULATION_FAULTS), "emulation-faults", "" },
}; };
#define __PERF_EVENT_FIELD(config, name) \ #define __PERF_EVENT_FIELD(config, name) \
@ -74,6 +76,8 @@ static const char *sw_event_names[] = {
"CPU-migrations", "CPU-migrations",
"minor-faults", "minor-faults",
"major-faults", "major-faults",
"alignment-faults",
"emulation-faults",
}; };
#define MAX_ALIASES 8 #define MAX_ALIASES 8