linux-kernel - [PATCH 0/2] perf, pt: Fix massive data losses

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Message-Id: <1462886313-13660-1-git-send-email-alexander.shishkin@linux.intel.com>
Date:	Tue, 10 May 2016 16:18:31 +0300
From:	Alexander Shishkin <alexander.shishkin@...ux.intel.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Thomas Gleixner <tglx@...utronix.de>, x86@...nel.org,
	Borislav Petkov <bp@...en8.de>, Ingo Molnar <mingo@...hat.com>,
	linux-kernel@...r.kernel.org, vince@...ter.net, eranian@...gle.com,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Markus Metzger <markus.t.metzger@...el.com>
Subject: [PATCH 0/2] perf, pt: Fix massive data losses

Hi Peter,

Markus reported that PT is losing a lot of its data in cpu-wide mode.
There are two problems in play here, both are amplified by the fact
that cpu-wide events don't normally get re-scheduled, so if we don't
disable them when their buffers are full, they get forever stuck.
Hence two patches. I propose to put these through perf/urgent and also
stable trees so that people with older kernels still get to collect
humongous amounts of PT traces in cpu-wide mode.

Alexander Shishkin (2):
  perf/x86/intel/pt: Generate PMI in the STOP region as well
  perf: Disable the event on a truncated AUX record

 arch/x86/events/intel/pt.c  |  2 ++
 kernel/events/ring_buffer.c | 10 +++++++++-
 2 files changed, 11 insertions(+), 1 deletion(-)

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2.8.1