linux-kernel - Re: [RFC][PATCH 3/9] perf: export registerred pmus via sysfs

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Message-ID: <1273587915.1810.1.camel@laptop>
Date:	Tue, 11 May 2010 16:25:15 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Borislav Petkov <bp@...64.org>
Cc:	Ingo Molnar <mingo@...e.hu>, Lin Ming <ming.m.lin@...el.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	"eranian@...il.com" <eranian@...il.com>,
	"Gary.Mohr@...l.com" <Gary.Mohr@...l.com>,
	Corey Ashford <cjashfor@...ux.vnet.ibm.com>,
	"arjan@...ux.intel.com" <arjan@...ux.intel.com>,
	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>,
	Paul Mackerras <paulus@...ba.org>,
	"David S. Miller" <davem@...emloft.net>,
	Russell King <rmk+kernel@....linux.org.uk>,
	Paul Mundt <lethal@...ux-sh.org>,
	lkml <linux-kernel@...r.kernel.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: Re: [RFC][PATCH 3/9] perf: export registerred pmus via sysfs

On Tue, 2010-05-11 at 16:15 +0200, Borislav Petkov wrote:
> Another point I have is that MCEs don't need pmus so we should consider
> having the ability to decouple events from pmus.

Strictly speaking tracepoints are software events, which run off of a
software 'pmu'. So no, we can't decouple, they need a 'pmu' context.

> What you basically want to have is a tracepoint which is "persistent,"
> as Ingo suggested earlier, and it buffers MCEs occurring at any time
> into a ring buffer until a userspace daemon or similar sucks that data
> out for processing (critical stuff is handled differently, of course).
> And this should work on any x86 hw supporting MCA without hw perf
> monitoring features. 

Try building x86 without perf hw support :/

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