From: Adrian Hunter <adrian.hunter@intel.com>
Date: Fri, 28 Jun 2013 13:22:18 +0000 (+0300)
Subject: perf/x86: Add ability to calculate TSC from perf sample timestamps
X-Git-Tag: v3.12-rc1~168^3~31
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c73deb6aecda2955716f31572516f09d930ef450;p=pandora-kernel.git

perf/x86: Add ability to calculate TSC from perf sample timestamps

For modern CPUs, perf clock is directly related to TSC.  TSC
can be calculated from perf clock and vice versa using a simple
calculation.  Two of the three componenets of that calculation
are already exported in struct perf_event_mmap_page.  This patch
exports the third.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Link: http://lkml.kernel.org/r/1372425741-1676-3-git-send-email-adrian.hunter@intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
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