linux-kernel - perf: Add duration

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Message-Id: <20190326221823.11518-1-andi@firstfloor.org>
Date:   Tue, 26 Mar 2019 15:18:19 -0700
From:   Andi Kleen <andi@...stfloor.org>
To:     acme@...nel.org
Cc:     jolsa@...nel.org, linux-kernel@...r.kernel.org,
        linux-perf-users@...r.kernel.org
Subject: perf: Add duration_time to perf stat

Currently it's not possible to get the wall clock time of a measurement
in CSV mode output, it's only in the non CSV perf stat output.
Often this is needed to normalize event counts to time.

Add a new duration_time event that can be specified and reports
the wall clock time in ns.