Date: Thu, 24 Nov 2016 00:22:02 +0100
From: Jiri Olsa <jolsa@redhat.com>
To: kan.liang@intel.com
Cc: peterz@infradead.org, mingo@redhat.com, acme@kernel.org,
        linux-kernel@vger.kernel.org, alexander.shishkin@linux.intel.com,
        tglx@linutronix.de, namhyung@kernel.org, jolsa@kernel.org,
        adrian.hunter@intel.com, wangnan0@huawei.com, mark.rutland@arm.com,
        andi@firstfloor.org
Subject: Re: [PATCH 14/14] perf script: show overhead events
Message-ID: <20161123232202.GL15978@krava>
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On Wed, Nov 23, 2016 at 04:44:52AM -0500, kan.liang@intel.com wrote:
> From: Kan Liang <kan.liang@intel.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