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perf stat: Add --quiet option
Add a new --quiet option to 'perf stat'. This is useful with 'perf stat
record' to write the data only to the perf.data file, which can lower
measurement overhead because the data doesn't need to be formatted.
On my 4C desktop:
% time ./perf stat record -e $(python -c 'print ",".join(["cycles"]*1000)') -a -I 1000 sleep 5
...
real 0m5.377s
user 0m0.238s
sys 0m0.452s
% time ./perf stat record --quiet -e $(python -c 'print ",".join(["cycles"]*1000)') -a -I 1000 sleep 5
real 0m5.452s
user 0m0.183s
sys 0m0.423s
In this example it cuts the user time by 20%. On systems with more cores
the savings are higher.
Signed-off-by: Andi Kleen <andi@firstfloor.org>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Cc: Alexey Budankov <alexey.budankov@linux.intel.com>
Link: http://lore.kernel.org/lkml/20201027002737.30942-1-andi@firstfloor.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat
-rw-r--r-- tools/perf/Documentation/perf-stat.txt 4
-rw-r--r-- tools/perf/builtin-stat.c 6
-rw-r--r-- tools/perf/util/stat.h 1
3 files changed, 10 insertions, 1 deletions
from mainline-5.11
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=55a4de94c64bacffbcd802c954764e0de2ab217f
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