From: Andi Kleen <andi@firstfloor.org>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Andi Kleen <andi@firstfloor.org>,
"Liang, Kan" <kan.liang@intel.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"mingo@kernel.org" <mingo@kernel.org>,
"acme@infradead.org" <acme@infradead.org>,
"eranian@google.com" <eranian@google.com>
Subject: Re: [PATCH V5 4/6] perf, x86: handle multiple records in PEBS buffer
Date: Mon, 30 Mar 2015 23:53:27 +0200 [thread overview]
Message-ID: <20150330215327.GJ2366@two.firstfloor.org> (raw)
In-Reply-To: <20150330212453.GH23123@twins.programming.kicks-ass.net>
> I just said I want a
> coherent story about what and why we're doing this.
What:
is clear, isn't it? Use this capability which has been long designed
into PEBS, but not used by perf.
Why:
The goal is to go to higher sampling rates with comparable or less overhead.
Higher sampling rates improve analysis of anything that is not
mostly doing the same thing over and over.
-Andi
--
ak@linux.intel.com -- Speaking for myself only.
next prev parent reply other threads:[~2015-03-30 21:53 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-02-23 14:25 [PATCH V5 0/6] large PEBS interrupt threshold Kan Liang
2015-02-23 14:25 ` [PATCH V5 1/6] perf, x86: use the PEBS auto reload mechanism when possible Kan Liang
2015-03-30 12:06 ` Peter Zijlstra
2015-03-30 14:02 ` Peter Zijlstra
2015-02-23 14:25 ` [PATCH V5 2/6] perf, x86: introduce setup_pebs_sample_data() Kan Liang
2015-02-23 14:25 ` [PATCH V5 3/6] perf, x86: large PEBS interrupt threshold Kan Liang
2015-03-02 17:08 ` Stephane Eranian
2015-03-02 17:59 ` Andi Kleen
2015-03-02 18:07 ` Stephane Eranian
2015-03-30 13:54 ` Peter Zijlstra
2015-02-23 14:25 ` [PATCH V5 4/6] perf, x86: handle multiple records in PEBS buffer Kan Liang
2015-03-30 13:45 ` Peter Zijlstra
2015-03-30 17:19 ` Liang, Kan
2015-03-30 17:25 ` Andi Kleen
2015-03-30 17:43 ` Liang, Kan
2015-03-30 17:45 ` Andi Kleen
2015-03-30 20:07 ` Peter Zijlstra
2015-03-30 20:11 ` Andi Kleen
2015-03-30 21:24 ` Peter Zijlstra
2015-03-30 21:53 ` Andi Kleen [this message]
2015-02-23 14:25 ` [PATCH V5 5/6] perf, x86: drain PEBS buffer during context switch Kan Liang
2015-03-30 13:50 ` Peter Zijlstra
2015-02-23 14:25 ` [PATCH V5 6/6] perf, x86: enlarge PEBS buffer Kan Liang
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