[PATCH 4/6] perf mem: Clean up perf_mem_event__supported()

kan.liang
2023-12-06T20:13:48Z

From: Kan Liang <kan.liang@linux.intel.com>

For some ARCHs, e.g., ARM and AMD, to get the availability of the
mem-events, perf checks the existence of a specific PMU. For the other
ARCHs, e.g., Intel and Power, perf has to check the existence of some
specific events.

The current perf only iterates the mem-events-supported PMUs. It's not
required to check the existence of a specific PMU anymore.

Rename sysfs_name to event_name, which stores the specific mem-events.
Perf only needs to check those events for the availability of the
mem-events.

Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
---
tools/perf/arch/arm64/util/mem-events.c | 8 ++++----
tools/perf/arch/powerpc/util/mem-events.c | 8 ++++----
tools/perf/arch/x86/util/mem-events.c | 20 ++++++++++----------
tools/perf/util/mem-events.c | 16 +++++++++-------
tools/perf/util/mem-events.h | 2 +-
5 files changed, 28 insertions(+), 26 deletions(-)

diff --git a/tools/perf/arch/arm64/util/mem-events.c b/tools/perf/arch/arm64/util/mem-events.c
index eb2ef84f0fc8..590dddd6b0ab 100644
--- a/tools/perf/arch/arm64/util/mem-events.c
+++ b/tools/perf/arch/arm64/util/mem-events.c
@@ -2,10 +2,10 @@
#include "map_symbol.h"
#include "mem-events.h"

-#define E(t, n, s, l, a) { .tag = t, .name = n, .sysfs_name = s, .ldlat = l, .aux_event = a }
+#define E(t, n, s, l, a) { .tag = t, .name = n, .event_name = s, .ldlat = l, .aux_event = a }

struct perf_mem_event perf_mem_events_arm[PERF_MEM_EVENTS__MAX] = {
- E("spe-load", "%s/ts_enable=1,pa_enable=1,load_filter=1,store_filter=0,min_latency=%u/", "arm_spe_0", true, 0),
- E("spe-store", "%s/ts_enable=1,pa_enable=1,load_filter=0,store_filter=1/", "arm_spe_0", false, 0),
- E("spe-ldst", "%s/ts_enable=1,pa_enable=1,load_filter=1,store_filter=1,min_latency=%u/", "arm_spe_0", true, 0),
+ E("spe-load", "%s/ts_enable=1,pa_enable=1,load_filter=1,store_filter=0,min_latency=%u/", NULL, true, 0),
+ E("spe-store", "%s/ts_enable=1,pa_enable=1,load_filter=0,store_filter=1/", NULL, false, 0),
+ E("spe-ldst", "%s/ts_enable=1,pa_enable=1,load_filter=1,store_filter=1,min_latency=%u/", NULL, true, 0),
};
diff --git a/tools/perf/arch/powerpc/util/mem-events.c b/tools/perf/arch/powerpc/util/mem-events.c
index b7883e38950f..72a6ac2b52f5 100644
--- a/tools/perf/arch/powerpc/util/mem-events.c
+++ b/tools/perf/arch/powerpc/util/mem-events.c
@@ -2,10 +2,10 @@
#include "map_symbol.h"
#include "mem-events.h"

-#define E(t, n, s, l, a) { .tag = t, .name = n, .sysfs_name = s, .ldlat = l, .aux_event = a }
+#define E(t, n, s, l, a) { .tag = t, .name = n, .event_name = s, .ldlat = l, .aux_event = a }

struct perf_mem_event perf_mem_events_power[PERF_MEM_EVENTS__MAX] = {
- E("ldlat-loads", "%s/mem-loads/", "cpu/events/mem-loads", false, 0),
- E("ldlat-stores", "%s/mem-stores/", "cpu/events/mem-stores", false, 0),
- E(NULL, NULL, NULL, false, 0),
+ E("ldlat-loads", "%s/mem-loads/", "mem-loads", false, 0),
+ E("ldlat-stores", "%s/mem-stores/", "mem-stores", false, 0),
+ E(NULL, NULL, NULL, false, 0),
};
diff --git a/tools/perf/arch/x86/util/mem-events.c b/tools/perf/arch/x86/util/mem-events.c
index f0e66a0151a0..b776d849fc64 100644
--- a/tools/perf/arch/x86/util/mem-events.c
+++ b/tools/perf/arch/x86/util/mem-events.c
@@ -9,24 +9,24 @@

#define MEM_LOADS_AUX 0x8203

-#define E(t, n, s, l, a) { .tag = t, .name = n, .sysfs_name = s, .ldlat = l, .aux_event = a }
+#define E(t, n, s, l, a) { .tag = t, .name = n, .event_name = s, .ldlat = l, .aux_event = a }

struct perf_mem_event perf_mem_events_intel[PERF_MEM_EVENTS__MAX] = {
- E("ldlat-loads", "%s/mem-loads,ldlat=%u/P", "%s/events/mem-loads", true, 0),
- E("ldlat-stores", "%s/mem-stores/P", "%s/events/mem-stores", false, 0),
- E(NULL, NULL, NULL, false, 0),
+ E("ldlat-loads", "%s/mem-loads,ldlat=%u/P", "mem-loads", true, 0),
+ E("ldlat-stores", "%s/mem-stores/P", "mem-stores", false, 0),
+ E(NULL, NULL, NULL, false, 0),
};

struct perf_mem_event perf_mem_events_intel_aux[PERF_MEM_EVENTS__MAX] = {
- E("ldlat-loads", "{%s/mem-loads-aux/,%s/mem-loads,ldlat=%u/}:P", "%s/events/mem-loads", true, MEM_LOADS_AUX),
- E("ldlat-stores", "%s/mem-stores/P", "%s/events/mem-stores", false, 0),
- E(NULL, NULL, NULL, false, 0),
+ E("ldlat-loads", "{%s/mem-loads-aux/,%s/mem-loads,ldlat=%u/}:P", "mem-loads", true, MEM_LOADS_AUX),
+ E("ldlat-stores", "%s/mem-stores/P", "mem-stores", false, 0),
+ E(NULL, NULL, NULL, false, 0),
};

struct perf_mem_event perf_mem_events_amd[PERF_MEM_EVENTS__MAX] = {
- E(NULL, NULL, NULL, false, 0),
- E(NULL, NULL, NULL, false, 0),
- E("mem-ldst", "%s//", "ibs_op", false, 0),
+ E(NULL, NULL, NULL, false, 0),
+ E(NULL, NULL, NULL, false, 0),
+ E("mem-ldst", "%s//", NULL, false, 0),
};

bool is_mem_loads_aux_event(struct evsel *leader)
diff --git a/tools/perf/util/mem-events.c b/tools/perf/util/mem-events.c
index 3a60cbcd6d8e..9ea9e9a868c4 100644
--- a/tools/perf/util/mem-events.c
+++ b/tools/perf/util/mem-events.c
@@ -17,12 +17,12 @@

unsigned int perf_mem_events__loads_ldlat = 30;

-#define E(t, n, s, l, a) { .tag = t, .name = n, .sysfs_name = s, .ldlat = l, .aux_event = a }
+#define E(t, n, s, l, a) { .tag = t, .name = n, .event_name = s, .ldlat = l, .aux_event = a }

struct perf_mem_event perf_mem_events[PERF_MEM_EVENTS__MAX] = {
- E("ldlat-loads", "%s/mem-loads/,ldlat=%u/P", "cpu/events/mem-loads", true, 0),
- E("ldlat-stores", "%s/mem-stores/P", "cpu/events/mem-stores", false, 0),
- E(NULL, NULL, NULL, false, 0),
+ E("ldlat-loads", "%s/mem-loads/,ldlat=%u/P", "mem-loads", true, 0),
+ E("ldlat-stores", "%s/mem-stores/P", "mem-stores", false, 0),
+ E(NULL, NULL, NULL, false, 0),
};
#undef E

@@ -150,12 +150,14 @@ int perf_mem_events__parse(struct perf_pmu *pmu, const char *str)
static bool perf_mem_event__supported(const char *mnt, struct perf_pmu *pmu,
struct perf_mem_event *e)
{
- char sysfs_name[100];
char path[PATH_MAX];
struct stat st;

- scnprintf(sysfs_name, sizeof(sysfs_name), e->sysfs_name, pmu->name);
- scnprintf(path, PATH_MAX, "%s/devices/%s", mnt, sysfs_name);
+ if (!e->event_name)
+ return true;
+
+ scnprintf(path, PATH_MAX, "%s/devices/%s/events/%s", mnt, pmu->name, e->event_name);
+
return !stat(path, &st);
}

diff --git a/tools/perf/util/mem-events.h b/tools/perf/util/mem-events.h
index d257cf67d6d9..d2875d731da8 100644
--- a/tools/perf/util/mem-events.h
+++ b/tools/perf/util/mem-events.h
@@ -18,7 +18,7 @@ struct perf_mem_event {
u32 aux_event;
const char *tag;
const char *name;
- const char *sysfs_name;
+ const char *event_name;
};

struct mem_info {
--
2.35.1