From: "Michael Kerrisk (man-pages)" <mtk.manpages-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
To: Vince Weaver <vincent.weaver-e7X0jjDqjFGHXe+LvDLADg@public.gmane.org>
Cc: mtk.manpages-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org,
linux-man-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
Kan Liang <kan.liang-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>,
Peter Zijlstra <peterz-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>,
Ingo Molnar <mingo-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
Stephane Eranian
<eranian-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Subject: Re: [patch] perf_event_open.2: PERF_RECORD_LOST_SAMPLES record type
Date: Mon, 17 Oct 2016 08:46:10 +0200 [thread overview]
Message-ID: <46a73e4c-1f0f-e14c-391c-e865f52ff9be@gmail.com> (raw)
In-Reply-To: <alpine.DEB.2.20.1610152201370.4137@macbook-air>
Hello Vince,
On 10/16/2016 04:02 AM, Vince Weaver wrote:
>
> Linux 4.2 added a new record type: PERF_RECORD_LOST_SAMPLES
> It is generated when hardware samples (currently only Intel PEBS)
> are lost.
Thanks! Applied!
Cheers,
Michael
> Signed-off-by: Vince Weaver <vincent.weaver-e7X0jjDqjFGHXe+LvDLADg@public.gmane.org>
>
> diff --git a/man2/perf_event_open.2 b/man2/perf_event_open.2
> index 9f33122..a47df2d 100644
> --- a/man2/perf_event_open.2
> +++ b/man2/perf_event_open.2
> @@ -2551,6 +2551,25 @@ process ID of the thread starting an instruction trace.
> .I tid
> thread ID of the thread starting an instruction trace.
> .RE
> +.TP
> +.BR PERF_RECORD_LOST_SAMPLES " (since Linux 4.2)"
> +\" f38b0dbb491a6987e198aa6b428db8692a6480f8
> +When using hardware sampling (such as Intel PEBS) this record
> +indicates some number of samples may have been lost.
> +
> +.in +4n
> +.nf
> +struct {
> + struct perf_event_header header;
> + u64 lost;
> + struct sample_id sample_id;
> +};
> +.fi
> +.RS
> +.TP
> +.I lost
> +the number of potentially lost samples.
> +.RE
> .RE
> .SS Overflow handling
> Events can be set to notify when a threshold is crossed,
>
--
Michael Kerrisk
Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/
Linux/UNIX System Programming Training: http://man7.org/training/
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prev parent reply other threads:[~2016-10-17 6:46 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-10-16 2:02 [patch] perf_event_open.2: PERF_RECORD_LOST_SAMPLES record type Vince Weaver
2016-10-17 6:46 ` Michael Kerrisk (man-pages) [this message]
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