linux-kernel - Re: [PATCH 14/14] perf script: show overhead events

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Date:   Thu, 24 Nov 2016 00:22:02 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     kan.liang@...el.com
Cc:     peterz@...radead.org, mingo@...hat.com, acme@...nel.org,
        linux-kernel@...r.kernel.org, alexander.shishkin@...ux.intel.com,
        tglx@...utronix.de, namhyung@...nel.org, jolsa@...nel.org,
        adrian.hunter@...el.com, wangnan0@...wei.com, mark.rutland@....com,
        andi@...stfloor.org
Subject: Re: [PATCH 14/14] perf script: show overhead events

On Wed, Nov 23, 2016 at 04:44:52AM -0500, kan.liang@...el.com wrote:
> From: Kan Liang <kan.liang@...el.com>
> 
> Introduce a new option --show-overhead to show overhead events in perf
> script

            perf  7356 [001]  7292.203517:     482010 cycles:pp:  ffffffff818e2150 _raw_spin_unlock_irqrestore+0x40 (/lib/modules/4.9.0-rc1+/build/vmlinux)
PERF_RECORD_USER_OVERHEAD [USER WRITE] nr: 1995  time: 14790661 cpu 1
PERF_RECORD_USER_OVERHEAD [ELAPSED TIME] time: 2721649901
            perf  7356 [001]  7292.203766:     482076 cycles:pp:  ffffffff81117f17 lock_release+0x37 (/lib/modules/4.9.0-rc1+/build/vmlinux)

I guess those 2 overhead events dont have context..?
should we make sure they are the last events?

thanks,
jirka