linux-kernel - [PATCH 0/1] perf/x86: Fix time_shift in perf_event_mmap

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Date:	Fri, 16 Oct 2015 16:24:04 +0300
From:	Adrian Hunter <adrian.hunter@...el.com>
To:	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>
Cc:	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Andy Lutomirski <luto@...capital.net>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org,
	Stephane Eranian <eranian@...gle.com>,
	Andi Kleen <ak@...ux.intel.com>
Subject: [PATCH 0/1] perf/x86: Fix time_shift in perf_event_mmap_page

Hi

There is a problem with my patch:
commit b20112edeadf ("perf/x86: Improve accuracy of perf/sched clock")
which is in tip at the moment.

The problem is that userspace does not expect time_shift in perf_event_mmap_page
to be as much as 32.  Here is a proposed fix.


Adrian Hunter (1):
      perf/x86: Fix time_shift in perf_event_mmap_page

 arch/x86/kernel/tsc.c           | 11 +++++++++++
 include/uapi/linux/perf_event.h |  4 ++--
 2 files changed, 13 insertions(+), 2 deletions(-)


Regards
Adrian
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