Messages in this thread | | | Subject | Re: [PATCH 02/18] perf: Add persistent event facilities | From | Peter Zijlstra <> | Date | Tue, 26 Apr 2011 12:57:50 +0200 |
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On Sat, 2011-04-23 at 18:28 +0200, Borislav Petkov wrote: > From: Borislav Petkov <borislav.petkov@amd.com> > > Add a barebones implementation for registering persistent events with > perf. For that, we don't destroy the buffers when they're unmapped and > we map them read-only so that multiple agents can access them. > > Signed-off-by: Borislav Petkov <borislav.petkov@amd.com> > --- > include/linux/perf_event.h | 22 ++++++++++++++++- > kernel/events/Makefile | 2 +- > kernel/events/core.c | 30 ++++++++++++++++++---- > kernel/events/persistent.c | 56 ++++++++++++++++++++++++++++++++++++++++++++ > 4 files changed, 102 insertions(+), 8 deletions(-) > create mode 100644 kernel/events/persistent.c > > diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h > index ee9f1e7..37bfae1 100644 > --- a/include/linux/perf_event.h > +++ b/include/linux/perf_event.h > @@ -216,8 +216,9 @@ struct perf_event_attr { > precise_ip : 2, /* skid constraint */ > mmap_data : 1, /* non-exec mmap data */ > sample_id_all : 1, /* sample_type all events */ > + persistent : 1, /* event always on */
But how will you find it again?
Persistent yells filesystem to me, and while we didn't use relayfs for various reasons, I think we do need something like it at the current stage.
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