diff options
| -rw-r--r-- | tools/perf/Documentation/perf-stat.txt | 6 | ||||
| -rw-r--r-- | tools/perf/builtin-stat.c | 31 | ||||
| -rw-r--r-- | tools/perf/util/cpumap.c | 46 | ||||
| -rw-r--r-- | tools/perf/util/cpumap.h | 12 |
4 files changed, 92 insertions, 3 deletions
diff --git a/tools/perf/Documentation/perf-stat.txt b/tools/perf/Documentation/perf-stat.txt index 46027e1aedb..2fe87fb558f 100644 --- a/tools/perf/Documentation/perf-stat.txt +++ b/tools/perf/Documentation/perf-stat.txt @@ -126,6 +126,12 @@ use --per-socket in addition to -a. (system-wide). The output includes the socket number and the number of online processors on that socket. This is useful to gauge the amount of aggregation. +--per-core:: +Aggregate counts per physical processor for system-wide mode measurements. This +is a useful mode to detect imbalance between physical cores. To enable this mode, +use --per-core in addition to -a. (system-wide). The output includes the +core number and the number of online logical processors on that physical processor. + EXAMPLES -------- diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c index 6f6ea931ab7..7e910bab109 100644 --- a/tools/perf/builtin-stat.c +++ b/tools/perf/builtin-stat.c @@ -80,6 +80,7 @@ enum aggr_mode { AGGR_NONE, AGGR_GLOBAL, AGGR_SOCKET, + AGGR_CORE, }; static int run_count = 1; @@ -384,6 +385,9 @@ static void print_interval(void) case AGGR_SOCKET: fprintf(output, "# time socket cpus counts events\n"); break; + case AGGR_CORE: + fprintf(output, "# time core cpus counts events\n"); + break; case AGGR_NONE: fprintf(output, "# time CPU counts events\n"); break; @@ -397,6 +401,7 @@ static void print_interval(void) num_print_interval = 0; switch (aggr_mode) { + case AGGR_CORE: case AGGR_SOCKET: print_aggr(prefix); break; @@ -566,13 +571,23 @@ static void print_noise(struct perf_evsel *evsel, double avg) print_noise_pct(stddev_stats(&ps->res_stats[0]), avg); } -static void aggr_printout(struct perf_evsel *evsel, int cpu, int nr) +static void aggr_printout(struct perf_evsel *evsel, int id, int nr) { switch (aggr_mode) { + case AGGR_CORE: + fprintf(output, "S%d-C%*d%s%*d%s", + cpu_map__id_to_socket(id), + csv_output ? 0 : -8, + cpu_map__id_to_cpu(id), + csv_sep, + csv_output ? 0 : 4, + nr, + csv_sep); + break; case AGGR_SOCKET: fprintf(output, "S%*d%s%*d%s", csv_output ? 0 : -5, - cpu, + id, csv_sep, csv_output ? 0 : 4, nr, @@ -581,7 +596,7 @@ static void aggr_printout(struct perf_evsel *evsel, int cpu, int nr) case AGGR_NONE: fprintf(output, "CPU%*d%s", csv_output ? 0 : -4, - perf_evsel__cpus(evsel)->map[cpu], csv_sep); + perf_evsel__cpus(evsel)->map[id], csv_sep); break; case AGGR_GLOBAL: default: @@ -1095,6 +1110,7 @@ static void print_stat(int argc, const char **argv) } switch (aggr_mode) { + case AGGR_CORE: case AGGR_SOCKET: print_aggr(NULL); break; @@ -1163,6 +1179,13 @@ static int perf_stat_init_aggr_mode(void) } aggr_get_id = cpu_map__get_socket; break; + case AGGR_CORE: + if (cpu_map__build_core_map(evsel_list->cpus, &aggr_map)) { + perror("cannot build core map"); + return -1; + } + aggr_get_id = cpu_map__get_core; + break; case AGGR_NONE: case AGGR_GLOBAL: default: @@ -1372,6 +1395,8 @@ int cmd_stat(int argc, const char **argv, const char *prefix __maybe_unused) "print counts at regular interval in ms (>= 100)"), OPT_SET_UINT(0, "per-socket", &aggr_mode, "aggregate counts per processor socket", AGGR_SOCKET), + OPT_SET_UINT(0, "per-core", &aggr_mode, + "aggregate counts per physical processor core", AGGR_CORE), OPT_END() }; const char * const stat_usage[] = { diff --git a/tools/perf/util/cpumap.c b/tools/perf/util/cpumap.c index 7bb8e87a584..beb8cf9f997 100644 --- a/tools/perf/util/cpumap.c +++ b/tools/perf/util/cpumap.c @@ -267,7 +267,53 @@ static int cpu_map__build_map(struct cpu_map *cpus, struct cpu_map **res, return 0; } +int cpu_map__get_core(struct cpu_map *map, int idx) +{ + FILE *fp; + const char *mnt; + char path[PATH_MAX]; + int cpu, ret, s; + + if (idx > map->nr) + return -1; + + cpu = map->map[idx]; + + mnt = sysfs_find_mountpoint(); + if (!mnt) + return -1; + + snprintf(path, PATH_MAX, + "%s/devices/system/cpu/cpu%d/topology/core_id", + mnt, cpu); + + fp = fopen(path, "r"); + if (!fp) + return -1; + ret = fscanf(fp, "%d", &cpu); + fclose(fp); + if (ret != 1) + return -1; + + s = cpu_map__get_socket(map, idx); + if (s == -1) + return -1; + + /* + * encode socket in upper 16 bits + * core_id is relative to socket, and + * we need a global id. So we combine + * socket+ core id + */ + return (s << 16) | (cpu & 0xffff); +} + int cpu_map__build_socket_map(struct cpu_map *cpus, struct cpu_map **sockp) { return cpu_map__build_map(cpus, sockp, cpu_map__get_socket); } + +int cpu_map__build_core_map(struct cpu_map *cpus, struct cpu_map **corep) +{ + return cpu_map__build_map(cpus, corep, cpu_map__get_core); +} diff --git a/tools/perf/util/cpumap.h b/tools/perf/util/cpumap.h index 161b00756a1..9bed02e5fb3 100644 --- a/tools/perf/util/cpumap.h +++ b/tools/perf/util/cpumap.h @@ -15,7 +15,9 @@ void cpu_map__delete(struct cpu_map *map); struct cpu_map *cpu_map__read(FILE *file); size_t cpu_map__fprintf(struct cpu_map *map, FILE *fp); int cpu_map__get_socket(struct cpu_map *map, int idx); +int cpu_map__get_core(struct cpu_map *map, int idx); int cpu_map__build_socket_map(struct cpu_map *cpus, struct cpu_map **sockp); +int cpu_map__build_core_map(struct cpu_map *cpus, struct cpu_map **corep); static inline int cpu_map__socket(struct cpu_map *sock, int s) { @@ -24,6 +26,16 @@ static inline int cpu_map__socket(struct cpu_map *sock, int s) return sock->map[s]; } +static inline int cpu_map__id_to_socket(int id) +{ + return id >> 16; +} + +static inline int cpu_map__id_to_cpu(int id) +{ + return id & 0xffff; +} + static inline int cpu_map__nr(const struct cpu_map *map) { return map ? map->nr : 1; |