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SubjectRe: [RFC PATCH 0/3] Perf persistent events
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Hi Borislav,

On Fri, 15 Mar 2013 14:06:26 +0100, Borislav Petkov wrote:
> From: Borislav Petkov <bp@suse.de>
>
> Yeah,
>
> here's a refresh of the persistent events deal, accessing those is much
> cleaner now. Here's how:
>
> So kernel code initializes and enables the event at its convenience
> (during boot, whenever) and userspace goes and says:
>
> sys_perf_event_open(pattr,...)
>
> with pattr.persistent = 1. Userspace gets the persistent buffer file
> descriptor to read from. Without that, we get a normal perf file
> descriptor for the duration of the tracing.
>
> This saves all the diddling of trying to hand down file descriptors
> through debugfs or whatever. Instead, current perf code simply can use
> it.

Interesting, it'll helpful profiling boot-time behaviors.

So my question is how can an user know which persistent events are
available in her system?

Thanks,
Namhyung

>
> This is still RFC but things are starting to fall into place slowly. As
> always, any and all comments/suggestions are welcome.
>
> Borislav Petkov (3):
> perf: Add persistent events
> perf: Add persistent event facilities
> MCE: Enable persistent event
>
> arch/x86/kernel/cpu/mcheck/mce.c | 25 +++++++
> include/linux/perf_event.h | 14 +++-
> include/uapi/linux/perf_event.h | 3 +-
> kernel/events/Makefile | 2 +-
> kernel/events/core.c | 27 +++++---
> kernel/events/internal.h | 4 ++
> kernel/events/persistent.c | 141 +++++++++++++++++++++++++++++++++++++++
> 7 files changed, 202 insertions(+), 14 deletions(-)
> create mode 100644 kernel/events/persistent.c


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