From 12c08a9f591aeda57fb3b05897169e7da5439a79 Mon Sep 17 00:00:00 2001 From: Stephane Eranian Date: Thu, 14 Feb 2013 13:57:29 +0100 Subject: perf stat: Add per-core aggregation This patch adds the --per-core option to perf stat. This option is used to aggregate system-wide counts on a per physical core basis. On processors with hyperthreading, this means counts of all HT threads running on a physical core are aggregated. This mode is useful to find imblance between physical cores running an uniform workload. Cores are identified by socket: S0-C1, means physical core 1 on socket 0. Note that cores are identified using their physical core id, thus their numbering may not be continuous. Per core aggregation can be combined with interval printing: # perf stat -a --per-core -I 1000 -e cycles sleep 1000 # time core cpus counts events 1.000090030 S0-C0 1 4,765,747 cycles 1.000090030 S0-C1 1 5,580,647 cycles 1.000090030 S0-C2 1 221,181 cycles 1.000090030 S0-C3 1 266,092 cycles Signed-off-by: Stephane Eranian Cc: Andi Kleen Cc: Ingo Molnar Cc: Jiri Olsa Cc: Namhyung Kim Cc: Peter Zijlstra Link: http://lkml.kernel.org/r/1360846649-6411-4-git-send-email-eranian@google.com [ committer note: Remove parts already applied on 86ee6e1 to keep bisectability ] Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/util/cpumap.c | 46 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 46 insertions(+) (limited to 'tools/perf/util/cpumap.c') diff --git a/tools/perf/util/cpumap.c b/tools/perf/util/cpumap.c index 7bb8e87..beb8cf9 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); +} -- cgit v1.1