Re: [PATCH 1/6] perf mem: Add mem_events into the supported perf_pmu

Ian Rogers
2023-12-06T21:01:34Z

On Wed, Dec 6, 2023 at 12:13 PM <kan.liang@linux.intel.com> wrote:
>
> From: Kan Liang <kan.liang@linux.intel.com>
>
> With the mem_events, perf doesn't need to read sysfs for each PMU to
> find the mem-events-supported PMU. The patch also makes it possible to
> clean up the related __weak functions later.
>
> The patch is only to add the mem_events into the perf_pmu for all ARCHs.
> It will be used in the later cleanup patches.
>
> Signed-off-by: Kan Liang <kan.liang@linux.intel.com>

Reviewed-by: Ian Rogers <irogers@google.com>

> ---
> tools/perf/arch/arm64/util/mem-events.c | 4 ++--
> tools/perf/arch/arm64/util/mem-events.h | 7 +++++++
> tools/perf/arch/arm64/util/pmu.c | 6 ++++++
> tools/perf/arch/s390/util/pmu.c | 3 +++
> tools/perf/arch/x86/util/mem-events.c | 4 ++--
> tools/perf/arch/x86/util/mem-events.h | 9 +++++++++
> tools/perf/arch/x86/util/pmu.c | 7 +++++++
> tools/perf/util/mem-events.c | 2 +-
> tools/perf/util/mem-events.h | 1 +
> tools/perf/util/pmu.c | 4 +++-
> tools/perf/util/pmu.h | 7 +++++++
> 11 files changed, 48 insertions(+), 6 deletions(-)
> create mode 100644 tools/perf/arch/arm64/util/mem-events.h
> create mode 100644 tools/perf/arch/x86/util/mem-events.h
>
> diff --git a/tools/perf/arch/arm64/util/mem-events.c b/tools/perf/arch/arm64/util/mem-events.c
> index 3bcc5c7035c2..aaa4804922b4 100644
> --- a/tools/perf/arch/arm64/util/mem-events.c
> +++ b/tools/perf/arch/arm64/util/mem-events.c
> @@ -4,7 +4,7 @@
>
> #define E(t, n, s) { .tag = t, .name = n, .sysfs_name = s }
>
> -static struct perf_mem_event perf_mem_events[PERF_MEM_EVENTS__MAX] = {
> +struct perf_mem_event perf_mem_events_arm[PERF_MEM_EVENTS__MAX] = {
> E("spe-load", "arm_spe_0/ts_enable=1,pa_enable=1,load_filter=1,store_filter=0,min_latency=%u/", "arm_spe_0"),
> E("spe-store", "arm_spe_0/ts_enable=1,pa_enable=1,load_filter=0,store_filter=1/", "arm_spe_0"),
> E("spe-ldst", "arm_spe_0/ts_enable=1,pa_enable=1,load_filter=1,store_filter=1,min_latency=%u/", "arm_spe_0"),
> @@ -17,7 +17,7 @@ struct perf_mem_event *perf_mem_events__ptr(int i)
> if (i >= PERF_MEM_EVENTS__MAX)
> return NULL;
>
> - return &perf_mem_events[i];
> + return &perf_mem_events_arm[i];
> }
>
> const char *perf_mem_events__name(int i, const char *pmu_name __maybe_unused)
> diff --git a/tools/perf/arch/arm64/util/mem-events.h b/tools/perf/arch/arm64/util/mem-events.h
> new file mode 100644
> index 000000000000..5fc50be4be38
> --- /dev/null
> +++ b/tools/perf/arch/arm64/util/mem-events.h
> @@ -0,0 +1,7 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +#ifndef _ARM64_MEM_EVENTS_H
> +#define _ARM64_MEM_EVENTS_H
> +
> +extern struct perf_mem_event perf_mem_events_arm[PERF_MEM_EVENTS__MAX];
> +
> +#endif /* _ARM64_MEM_EVENTS_H */
> diff --git a/tools/perf/arch/arm64/util/pmu.c b/tools/perf/arch/arm64/util/pmu.c
> index 2a4eab2d160e..69673fcf4a61 100644
> --- a/tools/perf/arch/arm64/util/pmu.c
> +++ b/tools/perf/arch/arm64/util/pmu.c
> @@ -8,6 +8,12 @@
> #include <api/fs/fs.h>
> #include <math.h>
>
> +void perf_pmu__arch_init(struct perf_pmu *pmu)
> +{
> + if (strcmp(pmu->name, "arm_spe_0"))
> + pmu->mem_events = perf_mem_events_arm;
> +}
> +
> const struct pmu_metrics_table *pmu_metrics_table__find(void)
> {
> struct perf_pmu *pmu;
> diff --git a/tools/perf/arch/s390/util/pmu.c b/tools/perf/arch/s390/util/pmu.c
> index 886c30e001fa..225d7dc2379c 100644
> --- a/tools/perf/arch/s390/util/pmu.c
> +++ b/tools/perf/arch/s390/util/pmu.c
> @@ -19,4 +19,7 @@ void perf_pmu__arch_init(struct perf_pmu *pmu)
> !strcmp(pmu->name, S390_PMUPAI_EXT) ||
> !strcmp(pmu->name, S390_PMUCPUM_CF))
> pmu->selectable = true;
> +
> + if (pmu->is_core)
> + pmu->mem_events = perf_mem_events;
> }
> diff --git a/tools/perf/arch/x86/util/mem-events.c b/tools/perf/arch/x86/util/mem-events.c
> index 191b372f9a2d..2b81d229982c 100644
> --- a/tools/perf/arch/x86/util/mem-events.c
> +++ b/tools/perf/arch/x86/util/mem-events.c
> @@ -16,13 +16,13 @@ static char mem_stores_name[100];
>
> #define E(t, n, s) { .tag = t, .name = n, .sysfs_name = s }
>
> -static struct perf_mem_event perf_mem_events_intel[PERF_MEM_EVENTS__MAX] = {
> +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"),
> E("ldlat-stores", "%s/mem-stores/P", "%s/events/mem-stores"),
> E(NULL, NULL, NULL),
> };
>
> -static struct perf_mem_event perf_mem_events_amd[PERF_MEM_EVENTS__MAX] = {
> +struct perf_mem_event perf_mem_events_amd[PERF_MEM_EVENTS__MAX] = {
> E(NULL, NULL, NULL),
> E(NULL, NULL, NULL),
> E("mem-ldst", "ibs_op//", "ibs_op"),
> diff --git a/tools/perf/arch/x86/util/mem-events.h b/tools/perf/arch/x86/util/mem-events.h
> new file mode 100644
> index 000000000000..3959e427f482
> --- /dev/null
> +++ b/tools/perf/arch/x86/util/mem-events.h
> @@ -0,0 +1,9 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +#ifndef _X86_MEM_EVENTS_H
> +#define _X86_MEM_EVENTS_H
> +
> +extern struct perf_mem_event perf_mem_events_intel[PERF_MEM_EVENTS__MAX];
> +
> +extern struct perf_mem_event perf_mem_events_amd[PERF_MEM_EVENTS__MAX];
> +
> +#endif /* _X86_MEM_EVENTS_H */
> diff --git a/tools/perf/arch/x86/util/pmu.c b/tools/perf/arch/x86/util/pmu.c
> index 469555ae9b3c..7e69f4f2e363 100644
> --- a/tools/perf/arch/x86/util/pmu.c
> +++ b/tools/perf/arch/x86/util/pmu.c
> @@ -15,6 +15,7 @@
> #include "../../../util/pmu.h"
> #include "../../../util/fncache.h"
> #include "../../../util/pmus.h"
> +#include "mem-events.h"
> #include "env.h"
>
> void perf_pmu__arch_init(struct perf_pmu *pmu __maybe_unused)
> @@ -30,6 +31,12 @@ void perf_pmu__arch_init(struct perf_pmu *pmu __maybe_unused)
> pmu->selectable = true;
> }
> #endif
> +
> + if (x86__is_amd_cpu()) {
> + if (strcmp(pmu->name, "ibs_op"))
> + pmu->mem_events = perf_mem_events_amd;
> + } else if (pmu->is_core)
> + pmu->mem_events = perf_mem_events_intel;
> }
>
> int perf_pmus__num_mem_pmus(void)
> diff --git a/tools/perf/util/mem-events.c b/tools/perf/util/mem-events.c
> index 3a2e3687878c..0a8f415f5efe 100644
> --- a/tools/perf/util/mem-events.c
> +++ b/tools/perf/util/mem-events.c
> @@ -19,7 +19,7 @@ unsigned int perf_mem_events__loads_ldlat = 30;
>
> #define E(t, n, s) { .tag = t, .name = n, .sysfs_name = s }
>
> -static struct perf_mem_event perf_mem_events[PERF_MEM_EVENTS__MAX] = {
> +struct perf_mem_event perf_mem_events[PERF_MEM_EVENTS__MAX] = {
> E("ldlat-loads", "cpu/mem-loads,ldlat=%u/P", "cpu/events/mem-loads"),
> E("ldlat-stores", "cpu/mem-stores/P", "cpu/events/mem-stores"),
> E(NULL, NULL, NULL),
> diff --git a/tools/perf/util/mem-events.h b/tools/perf/util/mem-events.h
> index b40ad6ea93fc..8c5694b2d0b0 100644
> --- a/tools/perf/util/mem-events.h
> +++ b/tools/perf/util/mem-events.h
> @@ -34,6 +34,7 @@ enum {
> };
>
> extern unsigned int perf_mem_events__loads_ldlat;
> +extern struct perf_mem_event perf_mem_events[PERF_MEM_EVENTS__MAX];
>
> int perf_mem_events__parse(const char *str);
> int perf_mem_events__init(void);
> diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c
> index 3c9609944a2f..3d4373b8ab63 100644
> --- a/tools/perf/util/pmu.c
> +++ b/tools/perf/util/pmu.c
> @@ -986,8 +986,10 @@ static int pmu_max_precise(int dirfd, struct perf_pmu *pmu)
> }
>
> void __weak
> -perf_pmu__arch_init(struct perf_pmu *pmu __maybe_unused)
> +perf_pmu__arch_init(struct perf_pmu *pmu)
> {
> + if (pmu->is_core)
> + pmu->mem_events = perf_mem_events;
> }
>
> struct perf_pmu *perf_pmu__lookup(struct list_head *pmus, int dirfd, const char *name)
> diff --git a/tools/perf/util/pmu.h b/tools/perf/util/pmu.h
> index 424c3fee0949..e35d985206db 100644
> --- a/tools/perf/util/pmu.h
> +++ b/tools/perf/util/pmu.h
> @@ -10,6 +10,8 @@
> #include <stdio.h>
> #include "parse-events.h"
> #include "pmu-events/pmu-events.h"
> +#include "map_symbol.h"

nit: unused?

> +#include "mem-events.h"
>
> struct evsel_config_term;
> struct perf_cpu_map;
> @@ -162,6 +164,11 @@ struct perf_pmu {
> */
> bool exclude_guest;
> } missing_features;
> +
> + /**
> + * @mem_events: List of the supported mem events
> + */
> + struct perf_mem_event *mem_events;
> };
>
> /** @perf_pmu__fake: A special global PMU used for testing. */
> --
> 2.35.1
>