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Date: Thu, 1 Feb 2024 16:03:39 +0800
From: Yang Jihong <yangjihong1@...wei.com>
To: Ian Rogers <irogers@...gle.com>
CC: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>,
Arnaldo Carvalho de Melo <acme@...nel.org>, Mark Rutland
<mark.rutland@....com>, Alexander Shishkin
<alexander.shishkin@...ux.intel.com>, Jiri Olsa <jolsa@...nel.org>, Namhyung
Kim <namhyung@...nel.org>, Adrian Hunter <adrian.hunter@...el.com>, Suzuki K
Poulose <suzuki.poulose@....com>, Mike Leach <mike.leach@...aro.org>, James
Clark <james.clark@....com>, Leo Yan <leo.yan@...aro.org>, John Garry
<john.g.garry@...cle.com>, Will Deacon <will@...nel.org>, Thomas Gleixner
<tglx@...utronix.de>, Darren Hart <dvhart@...radead.org>, Davidlohr Bueso
<dave@...olabs.net>, André Almeida <andrealmeid@...lia.com>,
Kan Liang <kan.liang@...ux.intel.com>, K Prateek Nayak
<kprateek.nayak@....com>, Sean Christopherson <seanjc@...gle.com>, Paolo
Bonzini <pbonzini@...hat.com>, Kajol Jain <kjain@...ux.ibm.com>, Athira
Rajeev <atrajeev@...ux.vnet.ibm.com>, Andrew Jones <ajones@...tanamicro.com>,
Alexandre Ghiti <alexghiti@...osinc.com>, Atish Patra <atishp@...osinc.com>,
"Steinar H. Gunderson" <sesse@...gle.com>, Yang Li
<yang.lee@...ux.alibaba.com>, Changbin Du <changbin.du@...wei.com>, Sandipan
Das <sandipan.das@....com>, Ravi Bangoria <ravi.bangoria@....com>, Paran Lee
<p4ranlee@...il.com>, Nick Desaulniers <ndesaulniers@...gle.com>, Huacai Chen
<chenhuacai@...nel.org>, Yanteng Si <siyanteng@...ngson.cn>,
<linux-perf-users@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<coresight@...ts.linaro.org>, <linux-arm-kernel@...ts.infradead.org>,
<bpf@...r.kernel.org>
Subject: Re: [PATCH v2 8/8] perf cpumap: Use perf_cpu_map__for_each_cpu when
possible
Hello,
On 2024/2/1 12:22, Ian Rogers wrote:
> Rather than manually iterating the CPU map, use
> perf_cpu_map__for_each_cpu. When possible tidy local variables.
>
> Signed-off-by: Ian Rogers <irogers@...gle.com>
> Reviewed-by: James Clark <james.clark@....com>
> ---
> tools/perf/arch/arm64/util/header.c | 10 ++--
> tools/perf/tests/bitmap.c | 13 +++---
> tools/perf/tests/topology.c | 46 +++++++++----------
> tools/perf/util/bpf_kwork.c | 16 ++++---
> tools/perf/util/bpf_kwork_top.c | 12 ++---
> tools/perf/util/cpumap.c | 12 ++---
> .../scripting-engines/trace-event-python.c | 12 +++--
> tools/perf/util/session.c | 5 +-
> tools/perf/util/svghelper.c | 20 ++++----
> 9 files changed, 72 insertions(+), 74 deletions(-)
>
> diff --git a/tools/perf/arch/arm64/util/header.c b/tools/perf/arch/arm64/util/header.c
> index a9de0b5187dd..741df3614a09 100644
> --- a/tools/perf/arch/arm64/util/header.c
> +++ b/tools/perf/arch/arm64/util/header.c
> @@ -4,8 +4,6 @@
> #include <stdio.h>
> #include <stdlib.h>
> #include <perf/cpumap.h>
> -#include <util/cpumap.h>
> -#include <internal/cpumap.h>
> #include <api/fs/fs.h>
> #include <errno.h>
> #include "debug.h"
> @@ -19,18 +17,18 @@
> static int _get_cpuid(char *buf, size_t sz, struct perf_cpu_map *cpus)
> {
> const char *sysfs = sysfs__mountpoint();
> - int cpu;
> - int ret = EINVAL;
> + struct perf_cpu cpu;
> + int idx, ret = EINVAL;
>
> if (!sysfs || sz < MIDR_SIZE)
> return EINVAL;
>
> - for (cpu = 0; cpu < perf_cpu_map__nr(cpus); cpu++) {
> + perf_cpu_map__for_each_cpu(cpu, idx, cpus) {
> char path[PATH_MAX];
> FILE *file;
>
> scnprintf(path, PATH_MAX, "%s/devices/system/cpu/cpu%d" MIDR,
> - sysfs, RC_CHK_ACCESS(cpus)->map[cpu].cpu);
> + sysfs, cpu.cpu);
>
> file = fopen(path, "r");
> if (!file) {
> diff --git a/tools/perf/tests/bitmap.c b/tools/perf/tests/bitmap.c
> index 0173f5402a35..98956e0e0765 100644
> --- a/tools/perf/tests/bitmap.c
> +++ b/tools/perf/tests/bitmap.c
> @@ -11,18 +11,19 @@
> static unsigned long *get_bitmap(const char *str, int nbits)
> {
> struct perf_cpu_map *map = perf_cpu_map__new(str);
> - unsigned long *bm = NULL;
> - int i;
> + unsigned long *bm;
>
> bm = bitmap_zalloc(nbits);
>
> if (map && bm) {
> - for (i = 0; i < perf_cpu_map__nr(map); i++)
> - __set_bit(perf_cpu_map__cpu(map, i).cpu, bm);
> + int i;
> + struct perf_cpu cpu;
> +
> + perf_cpu_map__for_each_cpu(cpu, i, map)
> + __set_bit(cpu.cpu, bm);
> }
>
> - if (map)
> - perf_cpu_map__put(map);
> + perf_cpu_map__put(map);
> return bm;
> }
>
> diff --git a/tools/perf/tests/topology.c b/tools/perf/tests/topology.c
> index 2a842f53fbb5..a8cb5ba898ab 100644
> --- a/tools/perf/tests/topology.c
> +++ b/tools/perf/tests/topology.c
> @@ -68,6 +68,7 @@ static int check_cpu_topology(char *path, struct perf_cpu_map *map)
> };
> int i;
> struct aggr_cpu_id id;
> + struct perf_cpu cpu;
>
> session = perf_session__new(&data, NULL);
> TEST_ASSERT_VAL("can't get session", !IS_ERR(session));
> @@ -113,8 +114,7 @@ static int check_cpu_topology(char *path, struct perf_cpu_map *map)
> TEST_ASSERT_VAL("Session header CPU map not set", session->header.env.cpu);
>
> for (i = 0; i < session->header.env.nr_cpus_avail; i++) {
> - struct perf_cpu cpu = { .cpu = i };
> -
> + cpu.cpu = i;
> if (!perf_cpu_map__has(map, cpu))
> continue;
> pr_debug("CPU %d, core %d, socket %d\n", i,
> @@ -123,48 +123,48 @@ static int check_cpu_topology(char *path, struct perf_cpu_map *map)
> }
>
> // Test that CPU ID contains socket, die, core and CPU
> - for (i = 0; i < perf_cpu_map__nr(map); i++) {
> - id = aggr_cpu_id__cpu(perf_cpu_map__cpu(map, i), NULL);
> + perf_cpu_map__for_each_cpu(cpu, i, map) {
> + id = aggr_cpu_id__cpu(cpu, NULL);
> TEST_ASSERT_VAL("Cpu map - CPU ID doesn't match",
> - perf_cpu_map__cpu(map, i).cpu == id.cpu.cpu);
> + cpu.cpu == id.cpu.cpu);
>
> TEST_ASSERT_VAL("Cpu map - Core ID doesn't match",
> - session->header.env.cpu[perf_cpu_map__cpu(map, i).cpu].core_id == id.core);
> + session->header.env.cpu[cpu.cpu].core_id == id.core);
> TEST_ASSERT_VAL("Cpu map - Socket ID doesn't match",
> - session->header.env.cpu[perf_cpu_map__cpu(map, i).cpu].socket_id ==
> + session->header.env.cpu[cpu.cpu].socket_id ==
> id.socket);
>
> TEST_ASSERT_VAL("Cpu map - Die ID doesn't match",
> - session->header.env.cpu[perf_cpu_map__cpu(map, i).cpu].die_id == id.die);
> + session->header.env.cpu[cpu.cpu].die_id == id.die);
> TEST_ASSERT_VAL("Cpu map - Node ID is set", id.node == -1);
> TEST_ASSERT_VAL("Cpu map - Thread IDX is set", id.thread_idx == -1);
> }
>
> // Test that core ID contains socket, die and core
> - for (i = 0; i < perf_cpu_map__nr(map); i++) {
> - id = aggr_cpu_id__core(perf_cpu_map__cpu(map, i), NULL);
> + perf_cpu_map__for_each_cpu(cpu, i, map) {
> + id = aggr_cpu_id__core(cpu, NULL);
> TEST_ASSERT_VAL("Core map - Core ID doesn't match",
> - session->header.env.cpu[perf_cpu_map__cpu(map, i).cpu].core_id == id.core);
> + session->header.env.cpu[cpu.cpu].core_id == id.core);
>
> TEST_ASSERT_VAL("Core map - Socket ID doesn't match",
> - session->header.env.cpu[perf_cpu_map__cpu(map, i).cpu].socket_id ==
> + session->header.env.cpu[cpu.cpu].socket_id ==
> id.socket);
>
> TEST_ASSERT_VAL("Core map - Die ID doesn't match",
> - session->header.env.cpu[perf_cpu_map__cpu(map, i).cpu].die_id == id.die);
> + session->header.env.cpu[cpu.cpu].die_id == id.die);
> TEST_ASSERT_VAL("Core map - Node ID is set", id.node == -1);
> TEST_ASSERT_VAL("Core map - Thread IDX is set", id.thread_idx == -1);
> }
>
> // Test that die ID contains socket and die
> - for (i = 0; i < perf_cpu_map__nr(map); i++) {
> - id = aggr_cpu_id__die(perf_cpu_map__cpu(map, i), NULL);
> + perf_cpu_map__for_each_cpu(cpu, i, map) {
> + id = aggr_cpu_id__die(cpu, NULL);
> TEST_ASSERT_VAL("Die map - Socket ID doesn't match",
> - session->header.env.cpu[perf_cpu_map__cpu(map, i).cpu].socket_id ==
> + session->header.env.cpu[cpu.cpu].socket_id ==
> id.socket);
>
> TEST_ASSERT_VAL("Die map - Die ID doesn't match",
> - session->header.env.cpu[perf_cpu_map__cpu(map, i).cpu].die_id == id.die);
> + session->header.env.cpu[cpu.cpu].die_id == id.die);
>
> TEST_ASSERT_VAL("Die map - Node ID is set", id.node == -1);
> TEST_ASSERT_VAL("Die map - Core is set", id.core == -1);
> @@ -173,10 +173,10 @@ static int check_cpu_topology(char *path, struct perf_cpu_map *map)
> }
>
> // Test that socket ID contains only socket
> - for (i = 0; i < perf_cpu_map__nr(map); i++) {
> - id = aggr_cpu_id__socket(perf_cpu_map__cpu(map, i), NULL);
> + perf_cpu_map__for_each_cpu(cpu, i, map) {
> + id = aggr_cpu_id__socket(cpu, NULL);
> TEST_ASSERT_VAL("Socket map - Socket ID doesn't match",
> - session->header.env.cpu[perf_cpu_map__cpu(map, i).cpu].socket_id ==
> + session->header.env.cpu[cpu.cpu].socket_id ==
> id.socket);
>
> TEST_ASSERT_VAL("Socket map - Node ID is set", id.node == -1);
> @@ -187,10 +187,10 @@ static int check_cpu_topology(char *path, struct perf_cpu_map *map)
> }
>
> // Test that node ID contains only node
> - for (i = 0; i < perf_cpu_map__nr(map); i++) {
> - id = aggr_cpu_id__node(perf_cpu_map__cpu(map, i), NULL);
> + perf_cpu_map__for_each_cpu(cpu, i, map) {
> + id = aggr_cpu_id__node(cpu, NULL);
> TEST_ASSERT_VAL("Node map - Node ID doesn't match",
> - cpu__get_node(perf_cpu_map__cpu(map, i)) == id.node);
> + cpu__get_node(cpu) == id.node);
> TEST_ASSERT_VAL("Node map - Socket is set", id.socket == -1);
> TEST_ASSERT_VAL("Node map - Die ID is set", id.die == -1);
> TEST_ASSERT_VAL("Node map - Core is set", id.core == -1);
> diff --git a/tools/perf/util/bpf_kwork.c b/tools/perf/util/bpf_kwork.c
> index 6eb2c78fd7f4..44f0f708a15d 100644
> --- a/tools/perf/util/bpf_kwork.c
> +++ b/tools/perf/util/bpf_kwork.c
> @@ -147,12 +147,12 @@ static bool valid_kwork_class_type(enum kwork_class_type type)
>
> static int setup_filters(struct perf_kwork *kwork)
> {
> - u8 val = 1;
> - int i, nr_cpus, key, fd;
> - struct perf_cpu_map *map;
> -
> if (kwork->cpu_list != NULL) {
> - fd = bpf_map__fd(skel->maps.perf_kwork_cpu_filter);
> + int idx, nr_cpus;
> + struct perf_cpu_map *map;
> + struct perf_cpu cpu;
> + int fd = bpf_map__fd(skel->maps.perf_kwork_cpu_filter);
> +
> if (fd < 0) {
> pr_debug("Invalid cpu filter fd\n");
> return -1;
> @@ -165,8 +165,8 @@ static int setup_filters(struct perf_kwork *kwork)
> }
>
> nr_cpus = libbpf_num_possible_cpus();
> - for (i = 0; i < perf_cpu_map__nr(map); i++) {
> - struct perf_cpu cpu = perf_cpu_map__cpu(map, i);
> + perf_cpu_map__for_each_cpu(cpu, idx, map) {
> + u8 val = 1;
>
> if (cpu.cpu >= nr_cpus) {
> perf_cpu_map__put(map);
> @@ -181,6 +181,8 @@ static int setup_filters(struct perf_kwork *kwork)
> }
>
> if (kwork->profile_name != NULL) {
> + int key, fd;
> +
> if (strlen(kwork->profile_name) >= MAX_KWORKNAME) {
> pr_err("Requested name filter %s too large, limit to %d\n",
> kwork->profile_name, MAX_KWORKNAME - 1);
> diff --git a/tools/perf/util/bpf_kwork_top.c b/tools/perf/util/bpf_kwork_top.c
> index 035e02272790..22a3b00a1e23 100644
> --- a/tools/perf/util/bpf_kwork_top.c
> +++ b/tools/perf/util/bpf_kwork_top.c
> @@ -122,11 +122,11 @@ static bool valid_kwork_class_type(enum kwork_class_type type)
>
> static int setup_filters(struct perf_kwork *kwork)
> {
> - u8 val = 1;
> - int i, nr_cpus, fd;
> - struct perf_cpu_map *map;
> -
> if (kwork->cpu_list) {
> + int idx, nr_cpus, fd;
> + struct perf_cpu_map *map;
> + struct perf_cpu cpu;
> +
> fd = bpf_map__fd(skel->maps.kwork_top_cpu_filter);
> if (fd < 0) {
> pr_debug("Invalid cpu filter fd\n");
> @@ -140,8 +140,8 @@ static int setup_filters(struct perf_kwork *kwork)
> }
>
> nr_cpus = libbpf_num_possible_cpus();
> - for (i = 0; i < perf_cpu_map__nr(map); i++) {
> - struct perf_cpu cpu = perf_cpu_map__cpu(map, i);
> + perf_cpu_map__for_each_cpu(cpu, idx, map) {
> + u8 val = 1;
>
> if (cpu.cpu >= nr_cpus) {
> perf_cpu_map__put(map);
For part of perf-kwork utility:
Reviewed-and-tested-by: Yang Jihong <yangjihong1@...wei.com>
Thanks,
Yang
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