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| author |   Peter Zijlstra <a.p.zijlstra@chello.nl> | 2009-03-25 19:39:37 +0100 |
|---|---|---|
| committer |   Ingo Molnar <mingo@elte.hu> | 2009-06-18 14:46:11 +0200 |
| commit | 43a21ea81a2400992561146327c4785ce7f7be38 (patch) | |
| tree | d4974c0ff9d7f40291515c5c0cf7e0d51abccb66 /tools/perf/builtin-record.c | |
| parent | fs: Provide empty .set_page_dirty() aop for anon inodes (diff) | |
| download | linux-dev-43a21ea81a2400992561146327c4785ce7f7be38.tar.xz linux-dev-43a21ea81a2400992561146327c4785ce7f7be38.zip | |
perf_counter: Add event overlow handling
Alternative method of mmap() data output handling that provides
better overflow management and a more reliable data stream.
Unlike the previous method, that didn't have any user->kernel
feedback and relied on userspace keeping up, this method relies on
userspace writing its last read position into the control page.
It will ensure new output doesn't overwrite not-yet read events,
new events for which there is no space left are lost and the
overflow counter is incremented, providing exact event loss
numbers.
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to '')
0 files changed, 0 insertions, 0 deletions