diff options
| author |   Arnaldo Carvalho de Melo <acme@redhat.com> | 2018-03-01 13:46:23 -0300 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2018-03-05 09:58:43 -0300 |
| commit | 67230479b2304be99e9451ee171aa288a112ea16 (patch) | |
| tree | ef8566f22145f433806f62fc7eaf7817cea486a5 /tools/perf/builtin-record.c | |
| parent | perf tests: Rename trace+probe_libc_inet_pton to record+probe_libc_inet_pton (diff) | |
| download | linux-dev-67230479b2304be99e9451ee171aa288a112ea16.tar.xz linux-dev-67230479b2304be99e9451ee171aa288a112ea16.zip | |
perf record: Allow asking for the maximum allowed sample rate
Add the handy '-F max' shortcut to reading and using the
kernel.perf_event_max_sample_rate value as the user supplied
sampling frequency:
# perf record -F max sleep 1
info: Using a maximum frequency rate of 15,000 Hz
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.019 MB perf.data (14 samples) ]
# sysctl kernel.perf_event_max_sample_rate
kernel.perf_event_max_sample_rate = 15000
# perf evlist -v
cycles:ppp: size: 112, { sample_period, sample_freq }: 15000, sample_type: IP|TID|TIME|PERIOD, disabled: 1, inherit: 1, mmap: 1, comm: 1, freq: 1, enable_on_exec: 1, task: 1, precise_ip: 3, sample_id_all: 1, exclude_guest: 1, mmap2: 1, comm_exec: 1
# perf record -F 10 sleep 1
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.019 MB perf.data (4 samples) ]
# perf evlist -v
cycles:ppp: size: 112, { sample_period, sample_freq }: 10, sample_type: IP|TID|TIME|PERIOD, disabled: 1, inherit: 1, mmap: 1, comm: 1, freq: 1, enable_on_exec: 1, task: 1, precise_ip: 3, sample_id_all: 1, exclude_guest: 1, mmap2: 1, comm_exec: 1
#
Suggested-by: Ingo Molnar <mingo@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: https://lkml.kernel.org/n/tip-4y0tiuws62c64gp4cf0hme0m@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/builtin-record.c')
| -rw-r--r-- | tools/perf/builtin-record.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c index 907267206973..e1821eea14ef 100644 --- a/tools/perf/builtin-record.c +++ b/tools/perf/builtin-record.c @@ -45,6 +45,7 @@ #include <errno.h> #include <inttypes.h> +#include <locale.h> #include <poll.h> #include <unistd.h> #include <sched.h> @@ -1542,7 +1543,9 @@ static struct option __record_options[] = { OPT_BOOLEAN(0, "tail-synthesize", &record.opts.tail_synthesize, "synthesize non-sample events at the end of output"), OPT_BOOLEAN(0, "overwrite", &record.opts.overwrite, "use overwrite mode"), - OPT_UINTEGER('F', "freq", &record.opts.user_freq, "profile at this frequency"), + OPT_CALLBACK('F', "freq", &record.opts, "freq or 'max'", + "profile at this frequency", + record__parse_freq), OPT_CALLBACK('m', "mmap-pages", &record.opts, "pages[,pages]", "number of mmap data pages and AUX area tracing mmap pages", record__parse_mmap_pages), @@ -1651,6 +1654,8 @@ int cmd_record(int argc, const char **argv) struct record *rec = &record; char errbuf[BUFSIZ]; + setlocale(LC_ALL, ""); + #ifndef HAVE_LIBBPF_SUPPORT # define set_nobuild(s, l, c) set_option_nobuild(record_options, s, l, "NO_LIBBPF=1", c) set_nobuild('\0', "clang-path", true); |