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

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>

diff --git a/include/linux/perf_counter.h b/include/linux/perf_counter.h
index 7b7fbf4..d6b95d1 100644 (file)
--- a/include/linux/perf_counter.h
+++ b/include/linux/perf_counter.h
@@ -106,6 +106,8 @@ enum perf_sw_ids {
        PERF_COUNT_SW_CPU_MIGRATIONS            = 4,
        PERF_COUNT_SW_PAGE_FAULTS_MIN           = 5,
        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 */
 };

diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
index 2e6d95f..a33707a 100644 (file)
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -102,6 +102,8 @@ enum perf_sw_ids {
        PERF_COUNT_SW_CPU_MIGRATIONS            = 4,
        PERF_COUNT_SW_PAGE_FAULTS_MIN           = 5,
        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 */
 };

diff --git a/kernel/perf_event.c b/kernel/perf_event.c
index 9d0b5c6..0683b33 100644 (file)
--- a/kernel/perf_event.c
+++ b/kernel/perf_event.c
@@ -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_CONTEXT_SWITCHES:
        case PERF_COUNT_SW_CPU_MIGRATIONS:
+       case PERF_COUNT_SW_ALIGNMENT_FAULTS:
+       case PERF_COUNT_SW_EMULATION_FAULTS:
                if (!event->parent) {
                        atomic_inc(&perf_swevent_enabled[event_id]);
                        event->destroy = sw_perf_event_destroy;

diff --git a/tools/perf/design.txt b/tools/perf/design.txt
index fdd42a8..f000c30 100644 (file)
--- a/tools/perf/design.txt
+++ b/tools/perf/design.txt
@@ -137,6 +137,8 @@ enum sw_event_ids {
        PERF_COUNT_SW_CPU_MIGRATIONS    = 4,
        PERF_COUNT_SW_PAGE_FAULTS_MIN   = 5,
        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

diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
index 8cfb48c..34bd844 100644 (file)
--- a/tools/perf/util/parse-events.c
+++ b/tools/perf/util/parse-events.c
@@ -46,6 +46,8 @@ static struct event_symbol event_symbols[] = {
   { CSW(PAGE_FAULTS_MAJ),      "major-faults",         ""              },
   { CSW(CONTEXT_SWITCHES),     "context-switches",     "cs"            },
   { CSW(CPU_MIGRATIONS),       "cpu-migrations",       "migrations"    },
+  { CSW(ALIGNMENT_FAULTS),     "alignment-faults",     ""              },
+  { CSW(EMULATION_FAULTS),     "emulation-faults",     ""              },
 };
 
 #define __PERF_EVENT_FIELD(config, name) \
@@ -74,6 +76,8 @@ static const char *sw_event_names[] = {
        "CPU-migrations",
        "minor-faults",
        "major-faults",
+       "alignment-faults",
+       "emulation-faults",
 };
 
 #define MAX_ALIASES 8