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SubjectRe: [PATCH 02/18] perf: Add persistent event facilities
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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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