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Re: [PATCH v2 2/4] perf: Add function to enable perf events in kernel with ring buffer

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Takao Indoh <indou.takao@jp.fujitsu.com> writes:

> perf_event_create_kernel_counter is used to enable perf events in kernel
> without buffer for logging its events. This patch add new fucntion which
> enable perf events with ring buffer. Intel PT logger uses this to enable
> Intel PT and some associated events with its log buffer.

Have you seen [1] and related patches? I haven't gotten around to
updating them yet, but hopefully it's going to happen soon.

The problem is that for such api to work, this memory needs to be
accounted, especially when you start handling event inheritance. For
system crash dump it doesn't really matter, but I also need a similar
api for per-task core dumps, for example.

[1] https://lkml.org/lkml/2014/10/13/290

Thanks,
--
Alex
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Thread

[PATCH v2 0/4] x86: Intel Processor Trace Logger Takao Indoh <indou.takao@jp.fujitsu.com> - 2015-09-08 07:50 +0200
  [PATCH v2 3/4] perf/x86/intel/pt: Add Intel PT logger Takao Indoh <indou.takao@jp.fujitsu.com> - 2015-09-08 08:00 +0200
    Re: [PATCH v2 3/4] perf/x86/intel/pt: Add Intel PT logger Alexander Shishkin <alexander.shishkin@linux.intel.com> - 2015-09-08 11:50 +0200
      Re: [PATCH v2 3/4] perf/x86/intel/pt: Add Intel PT logger Takao Indoh <indou.takao@jp.fujitsu.com> - 2015-09-09 04:50 +0200
        Re: [PATCH v2 3/4] perf/x86/intel/pt: Add Intel PT logger Alexander Shishkin <alexander.shishkin@linux.intel.com> - 2015-09-15 14:10 +0200
  [PATCH v2 4/4] x86: Stop Intel PT and save its registers when panic occurs Takao Indoh <indou.takao@jp.fujitsu.com> - 2015-09-08 08:00 +0200
  [PATCH v2 2/4] perf: Add function to enable perf events in kernel with ring buffer Takao Indoh <indou.takao@jp.fujitsu.com> - 2015-09-08 08:00 +0200
    Re: [PATCH v2 2/4] perf: Add function to enable perf events in kernel with ring buffer Alexander Shishkin <alexander.shishkin@linux.intel.com> - 2015-09-08 11:40 +0200
      Re: [PATCH v2 2/4] perf: Add function to enable perf events in kernel  with ring buffer Takao Indoh <indou.takao@jp.fujitsu.com> - 2015-09-09 04:20 +0200
        Re: [PATCH v2 2/4] perf: Add function to enable perf events in kernel with ring buffer Alexander Shishkin <alexander.shishkin@linux.intel.com> - 2015-09-15 14:10 +0200
  [PATCH v2 1/4] perf/trace: Add function to find event type by name Takao Indoh <indou.takao@jp.fujitsu.com> - 2015-09-08 08:00 +0200

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