perf record: Add switch-output size warning
authorJiri Olsa <jolsa@kernel.org>
Mon, 9 Jan 2017 09:51:59 +0000 (10:51 +0100)
committerArnaldo Carvalho de Melo <acme@redhat.com>
Wed, 11 Jan 2017 19:48:02 +0000 (16:48 -0300)
commit0c5824498e8bd5b7d30dc03448cd89efaee4bead
tree67f7b3faa4cf8a38419e1e274aea33995451b02a
parentdc0c6127c231d4d264570497a916fa19740c915b
perf record: Add switch-output size warning

Adding switch-output size warning if the requested
size of lower than the wakeup ring buffer size.

  $ perf record --switch-output=1K ls
  WARNING: switch-output data size lower than wakeup kernel buffer size (258K) expect bigger perf.data sizes
  ...

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Suggested-and-Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/r/1483955520-29063-6-git-send-email-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
tools/perf/builtin-record.c
tools/perf/util/evlist.c
tools/perf/util/evlist.h