linux-kernel - Re: [RFC][PATCH 2/9] perf: core, remove hw_perf_event

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Date:	Mon, 10 May 2010 18:15:21 +0800
From:	Lin Ming <ming.m.lin@...el.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Ingo Molnar <mingo@...e.hu>,
	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>
Subject: Re: [RFC][PATCH 2/9] perf: core, remove hw_perf_event_init

On Mon, 2010-05-10 at 17:42 +0800, Peter Zijlstra wrote:
> On Mon, 2010-05-10 at 17:26 +0800, Lin Ming wrote:
> > A new field "pmu_id" is added to struct perf_event_attr.
> > 
> > 2 new functions: perf_event_register_pmu, perf_event_lookup_pmu
> > perf_event_register_pmu: the pmu registration facility
> > perf_event_lookup_pmu: lookup the pmu via the passed in event->attr.pmu_id.
> > 
> > A new api pmu->init_event to replace hw_perf_event_init
> 
> Another problem, this patch breaks all of perf by removing the weak call
> before there is a replacement.
> 
> Please rework such that there is a smooth transition.

OK, I'll rework

> 
> Also, for compatibilities sake, the cpu pmu will be required to get
> pmu_id==0, this doesn't provide that.
> 

Will provide that.

Thanks,
Lin Ming

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