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From: Andi Kleen <ak@linux.jf.intel.com>
To: Dave Hansen <dave@sr71.net>
Cc: Stephane Eranian <eranian@google.com>,
	Dave Hansen <dave.hansen@intel.com>,
	LKML <linux-kernel@vger.kernel.org>,
	Peter Zijlstra <peterz@infradead.org>,
	"mingo@elte.hu" <mingo@elte.hu>,
	dave.hansen@linux.jf.intel.com, Jiri Olsa <jolsa@redhat.com>
Subject: Re: [PATCH] perf: fix interrupt handler timing harness
Date: Mon, 8 Jul 2013 13:54:01 -0700	[thread overview]
Message-ID: <20130708205401.GG5643@tassilo.jf.intel.com> (raw)
In-Reply-To: <51DB2271.1010009@sr71.net>

> I did a quite a bit of ftracing to look for spots inside the handler
> which were taking large amounts of time.  There were none.  The
> execution time was spread very evenly over the entire nmi handler.  It
> didn't appear to be any individual hot cachelines or doing something
> silly like sitting in a loop handling lots of PMU events.

In some cases callgraphs seemed to be quite expensive (large fraction
of the handler time)

-Andi

  reply	other threads:[~2013-07-08 20:54 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-07-04 22:30 Stephane Eranian
2013-07-05  6:54 ` Ingo Molnar
2013-07-05  9:54 ` [tip:perf/urgent] perf: Fix " tip-bot for Stephane Eranian
2013-07-08 14:34 ` [PATCH] perf: fix " Dave Hansen
2013-07-08 18:08   ` Stephane Eranian
2013-07-08 20:05     ` Dave Hansen
2013-07-08 20:20       ` Stephane Eranian
2013-07-08 20:34         ` Dave Hansen
2013-07-08 20:54           ` Andi Kleen [this message]
2013-07-08 20:56             ` Stephane Eranian

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