On Wed, Apr 13, 2016 at 08:21:03AM +0000, Wang Nan wrote: > This patch set is a preparation to support overwritable ring buffer. > However, even without the kernel side core patch [1] is accept this > patch set is still useful. > > With this patch set, perf switches output when receiving SIGUSR2. For > example: > > # perf record -a -F99 --switch-output & > [1] 26435 > # kill -s SIGUSR2 26435 > [ perf record: dump data: Woken up 1 times ] > # [ perf record: Dump perf.data.2016041323544373 ] > # kill -s SIGUSR2 26435 > [ perf record: dump data: Woken up 1 times ] > # [ perf record: Dump perf.data.2016041323544730 ] > # fg > perf record -a -F99 --switch-output > ^C[ perf record: Woken up 1 times to write data ] > [ perf record: Dump perf.data.2016041323545019 ] > [ perf record: Captured and wrote 0.395 MB perf.data.<timestamp> ] > > User can periodically generates perf trace with a simple script, then > remove most of them, only keeps scripts collected when something > unusual is detected. > > After [1], perf can be totally silent before receiving SIGUSR2. Trace > is collected in kernel overwritable ring buffer, and dumpped when > SIGUSR2 is received. > > [1] > http://lkml.kernel.org/r/[email protected] > > Cc: Wang Nan <[email protected]> > Cc: He Kuang <[email protected]> > Cc: Arnaldo Carvalho de Melo <[email protected]> > Cc: Jiri Olsa <[email protected]> > Cc: Masami Hiramatsu <[email protected]> > Cc: Namhyung Kim <[email protected]> > Cc: Zefan Li <[email protected]> > Cc: [email protected] > > Wang Nan (10): > perf tools: Make ordered_events reusable > perf tools: Add perf_data_file__switch() helper > perf record: Turns auxtrace_snapshot_enable into 3 states > perf record: Add '--timestamp-filename' option to append timestamp to > output filename > perf record: Split output into multiple files via '--switch-output' > perf record: Force enable --timestamp-filename when --switch-output is > provided > perf record: Disable buildid cache options by default in switch output > mode > perf record: Re-synthesize tracking events after output switching > perf record: Generate tracking events for process forked by perf > perf core: Add backward attribute to perf event
I did not get 3/10 patch and the patchset did not apply cleanly, git am failed.. would you have it in a branch somewhere? thanks, jirka
