Storing CPU cache details under perf data. It's stored as new HEADER_CACHE feature and it's displayed under header info with -I option:
$ perf report --header-only -I ... # cache info: # L1 Data 32K [0-1] # L1 Instruction 32K [0-1] # L1 Data 32K [2-3] # L1 Instruction 32K [2-3] # L2 Unified 256K [0-1] # L2 Unified 256K [2-3] # L3 Unified 4096K [0-3] ... All distinct caches are stored/displayed. Link: http://lkml.kernel.org/n/tip-byxl1gwto8z9d5hyozprt...@git.kernel.org Signed-off-by: Jiri Olsa <jo...@kernel.org> --- tools/perf/util/env.c | 13 +++ tools/perf/util/env.h | 15 +++ tools/perf/util/header.c | 265 +++++++++++++++++++++++++++++++++++++++++++++++ tools/perf/util/header.h | 1 + 4 files changed, 294 insertions(+) diff --git a/tools/perf/util/env.c b/tools/perf/util/env.c index 7dd5939dea2e..02a6970f2495 100644 --- a/tools/perf/util/env.c +++ b/tools/perf/util/env.c @@ -6,6 +6,8 @@ struct perf_env perf_env; void perf_env__exit(struct perf_env *env) { + int i; + zfree(&env->hostname); zfree(&env->os_release); zfree(&env->version); @@ -19,6 +21,10 @@ void perf_env__exit(struct perf_env *env) zfree(&env->numa_nodes); zfree(&env->pmu_mappings); zfree(&env->cpu); + + for (i = 0; i < env->caches_cnt; i++) + cache_level__free(&env->caches[i]); + zfree(&env->caches); } int perf_env__set_cmdline(struct perf_env *env, int argc, const char *argv[]) @@ -75,3 +81,10 @@ int perf_env__read_cpu_topology_map(struct perf_env *env) env->nr_cpus_avail = nr_cpus; return 0; } + +void cache_level__free(struct cache_level *cache) +{ + free(cache->type); + free(cache->map); + free(cache->size); +} diff --git a/tools/perf/util/env.h b/tools/perf/util/env.h index 0132b9557c02..9963499820e7 100644 --- a/tools/perf/util/env.h +++ b/tools/perf/util/env.h @@ -1,11 +1,23 @@ #ifndef __PERF_ENV_H #define __PERF_ENV_H +#include <linux/types.h> + struct cpu_topology_map { int socket_id; int core_id; }; +struct cache_level { + u32 level; + u32 line_size; + u32 sets; + u32 ways; + char *type; + char *size; + char *map; +}; + struct perf_env { char *hostname; char *os_release; @@ -31,6 +43,8 @@ struct perf_env { char *numa_nodes; char *pmu_mappings; struct cpu_topology_map *cpu; + struct cache_level *caches; + int caches_cnt; }; extern struct perf_env perf_env; @@ -41,4 +55,5 @@ int perf_env__set_cmdline(struct perf_env *env, int argc, const char *argv[]); int perf_env__read_cpu_topology_map(struct perf_env *env); +void cache_level__free(struct cache_level *cache); #endif /* __PERF_ENV_H */ diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c index f50b7235ecb6..55d5a7ff25f6 100644 --- a/tools/perf/util/header.c +++ b/tools/perf/util/header.c @@ -23,6 +23,8 @@ #include "strbuf.h" #include "build-id.h" #include "data.h" +#include <api/fs/fs.h> +#include "asm/bug.h" /* * magic2 = "PERFILE2" @@ -868,6 +870,197 @@ static int write_auxtrace(int fd, struct perf_header *h, return err; } +static int cache_level__sort(const void *a, const void *b) +{ + struct cache_level *cache_a = (struct cache_level *) a; + struct cache_level *cache_b = (struct cache_level *) b; + + return cache_a->level - cache_b->level; +} + +static bool cache_level__cmp(struct cache_level *a, struct cache_level *b) +{ + if (a->level != b->level) + return false; + + if (a->line_size != b->line_size) + return false; + + if (a->sets != b->sets) + return false; + + if (a->ways != b->ways) + return false; + + if (strcmp(a->type, b->type)) + return false; + + if (strcmp(a->size, b->size)) + return false; + + if (strcmp(a->map, b->map)) + return false; + + return true; +} + +static int cache_level__read(struct cache_level *cache, u32 cpu, u16 level) +{ + char path[PATH_MAX], file[PATH_MAX]; + struct stat st; + size_t len; + + scnprintf(path, PATH_MAX, "devices/system/cpu/cpu%d/cache/index%d/", cpu, level); + scnprintf(file, PATH_MAX, "%s/%s", sysfs__mountpoint(), path); + + if (stat(file, &st)) + return 1; + + scnprintf(file, PATH_MAX, "%s/level", path); + if (sysfs__read_int(file, (int *) &cache->level)) + return -1; + + scnprintf(file, PATH_MAX, "%s/coherency_line_size", path); + if (sysfs__read_int(file, (int *) &cache->line_size)) + return -1; + + scnprintf(file, PATH_MAX, "%s/number_of_sets", path); + if (sysfs__read_int(file, (int *) &cache->sets)) + return -1; + + scnprintf(file, PATH_MAX, "%s/ways_of_associativity", path); + if (sysfs__read_int(file, (int *) &cache->ways)) + return -1; + + scnprintf(file, PATH_MAX, "%s/type", path); + if (sysfs__read_str(file, &cache->type, &len)) + return -1; + + cache->type[len] = 0; + cache->type = rtrim(cache->type); + + scnprintf(file, PATH_MAX, "%s/size", path); + if (sysfs__read_str(file, &cache->size, &len)) { + free(cache->type); + return -1; + } + + cache->size[len] = 0; + cache->size = rtrim(cache->size); + + scnprintf(file, PATH_MAX, "%s/shared_cpu_list", path); + if (sysfs__read_str(file, &cache->map, &len)) { + free(cache->map); + free(cache->type); + return -1; + } + + cache->map[len] = 0; + cache->map = rtrim(cache->map); + return 0; +} + +static void cache_level__fprintf(FILE *out, struct cache_level *c) +{ + fprintf(out, "L%d %s %s [%s]\n", c->level, c->type, c->size, c->map); +} + +static int build_caches(struct cache_level caches[], u32 size, u32 *cntp) +{ + u32 i, cnt = 0; + long ncpus; + u32 nr, cpu; + u16 level; + + ncpus = sysconf(_SC_NPROCESSORS_CONF); + if (ncpus < 0) + return -1; + + nr = (u32)(ncpus & UINT_MAX); + + for (cpu = 0; cpu < nr; cpu++) { + for (level = 0; level < 10; level++) { + struct cache_level c; + int err; + + err = cache_level__read(&c, cpu, level); + if (err < 0) + return err; + + if (err == 1) + break; + + for (i = 0; i < cnt; i++) { + if (cache_level__cmp(&c, &caches[i])) + break; + } + + if (i == cnt) + caches[cnt++] = c; + + if (WARN_ONCE(cnt == size, "way too many cpu caches..")) + goto out; + } + } + out: + *cntp = cnt; + return 0; +} + +#define MAX_CACHES 2000 + +static int write_cache(int fd, struct perf_header *h __maybe_unused, + struct perf_evlist *evlist __maybe_unused) +{ + struct cache_level caches[MAX_CACHES]; + u32 cnt = 0, i, version = 1; + int ret; + + ret = build_caches(caches, MAX_CACHES, &cnt); + if (ret) + goto out; + + qsort(&caches, cnt, sizeof(struct cache_level), cache_level__sort); + + ret = do_write(fd, &version, sizeof(u32)); + if (ret < 0) + goto out; + + ret = do_write(fd, &cnt, sizeof(u32)); + if (ret < 0) + goto out; + + for (i = 0; i < cnt; i++) { + struct cache_level *c = &caches[i]; + + #define _W(v) \ + ret = do_write(fd, &c->v, sizeof(u32)); \ + if (ret < 0) \ + goto out; + + _W(level) + _W(line_size) + _W(sets) + _W(ways) + #undef _W + + #define _W(v) \ + ret = do_write_string(fd, (const char *) c->v); \ + if (ret < 0) \ + goto out; + + _W(type) + _W(size) + _W(map) + #undef _W + } + +out: + for (i = 0; i < cnt; i++) + cache_level__free(&caches[i]); + return ret; +} + static int write_stat(int fd __maybe_unused, struct perf_header *h __maybe_unused, struct perf_evlist *evlist __maybe_unused) @@ -1172,6 +1365,18 @@ static void print_stat(struct perf_header *ph __maybe_unused, fprintf(fp, "# contains stat data\n"); } +static void print_cache(struct perf_header *ph __maybe_unused, + int fd __maybe_unused, FILE *fp __maybe_unused) +{ + int i; + + fprintf(fp, "# cache info:\n"); + for (i = 0; i < ph->env.caches_cnt; i++) { + fprintf(fp, "# "); + cache_level__fprintf(fp, &ph->env.caches[i]); + } +} + static void print_pmu_mappings(struct perf_header *ph, int fd __maybe_unused, FILE *fp) { @@ -1920,6 +2125,65 @@ static int process_auxtrace(struct perf_file_section *section, return err; } +static int process_cache(struct perf_file_section *section __maybe_unused, + struct perf_header *ph __maybe_unused, int fd __maybe_unused, + void *data __maybe_unused) +{ + struct cache_level *caches; + u32 cnt, i, version; + + if (readn(fd, &version, sizeof(version)) != sizeof(version)) + return -1; + + if (ph->needs_swap) + version = bswap_32(version); + + if (version != 1) + return -1; + + if (readn(fd, &cnt, sizeof(cnt)) != sizeof(cnt)) + return -1; + + if (ph->needs_swap) + cnt = bswap_32(cnt); + + caches = zalloc(sizeof(struct cache_level) * cnt); + if (!caches) + return -1; + + for (i = 0; i < cnt; i++) { + struct cache_level c; + + #define _R(v) \ + if (readn(fd, &c.v, sizeof(u32)) != sizeof(u32))\ + return -1; \ + if (ph->needs_swap) \ + c.v = bswap_32(c.v); \ + + _R(level) + _R(line_size) + _R(sets) + _R(ways) + #undef _R + + #define _R(v) \ + c.v = do_read_string(fd, ph); \ + if (!c.v) \ + return -1; + + _R(type) + _R(size) + _R(map) + #undef _R + + caches[i] = c; + } + + ph->env.caches = caches; + ph->env.caches_cnt = cnt; + return 0; +} + struct feature_ops { int (*write)(int fd, struct perf_header *h, struct perf_evlist *evlist); void (*print)(struct perf_header *h, int fd, FILE *fp); @@ -1962,6 +2226,7 @@ static const struct feature_ops feat_ops[HEADER_LAST_FEATURE] = { FEAT_OPP(HEADER_GROUP_DESC, group_desc), FEAT_OPP(HEADER_AUXTRACE, auxtrace), FEAT_OPA(HEADER_STAT, stat), + FEAT_OPF(HEADER_CACHE, cache), }; struct header_print_data { diff --git a/tools/perf/util/header.h b/tools/perf/util/header.h index cff9892452ee..3d87ca823c0a 100644 --- a/tools/perf/util/header.h +++ b/tools/perf/util/header.h @@ -32,6 +32,7 @@ enum { HEADER_GROUP_DESC, HEADER_AUXTRACE, HEADER_STAT, + HEADER_CACHE, HEADER_LAST_FEATURE, HEADER_FEAT_BITS = 256, }; -- 2.4.3
