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| author | Don Zickus | 2014-03-14 15:43:44 +0100 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo | 2014-03-14 22:08:41 +0100 |
| commit | 363b785f3805a2632eb09a8b430842461c21a640 (patch) | |
| tree | 1d6dcd4a3e7c0309c1c19a16ea53c45cd1de5407 /scripts/recordmcount.pl | |
| parent | perf kvm: introduce --list-cmds for use by scripts (diff) | |
| download | kernel-qcow2-linux-363b785f3805a2632eb09a8b430842461c21a640.tar.gz kernel-qcow2-linux-363b785f3805a2632eb09a8b430842461c21a640.tar.xz kernel-qcow2-linux-363b785f3805a2632eb09a8b430842461c21a640.zip | |
perf tools: Speed up thread map generation
When trying to capture perf data on a system running spejbb2013, perf
hung for about 15 minutes. This is because it took that long to gather
about 10,000 thread maps and process them.
I don't think a user wants to wait that long.
Instead, recognize that thread maps are roughly equivalent to pid maps
and just quickly copy those instead.
To do this, I synthesize 'fork' events, this eventually calls
thread__fork() and copies the maps over.
The overhead goes from 15 minutes down to about a few seconds.
--
V2: based on Jiri's comments, moved malloc up a level
and made sure the memory was freed
Signed-off-by: Don Zickus <dzickus@redhat.com>
Acked-by: Jiri Olsa <jolsa@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Joe Mario <jmario@redhat.com>
Link: http://lkml.kernel.org/r/1394808224-113774-1-git-send-email-dzickus@redhat.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'scripts/recordmcount.pl')
0 files changed, 0 insertions, 0 deletions