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Message-ID: <1273484430.5605.3334.camel@twins>
Date:	Mon, 10 May 2010 11:40:30 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Lin Ming <ming.m.lin@...el.com>
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 17:26 +0800, Lin Ming wrote:
> +static struct pmu *perf_event_lookup_pmu(struct perf_event *event)
> +{
> +       struct pmu *pmu;
> +       int pmu_id = event->attr.pmu_id;
> +
> +       list_for_each_entry(pmu, &pmus, entry) {
> +               if (pmu->id == pmu_id)
> +                       return pmu;
> +       }
> +
> +       return NULL;
> +}

> +void perf_event_register_pmu(struct pmu *pmu)
> +{
> +       pmu->id = pmu_id_curr++;
> +       list_add_tail(&pmu->entry, &pmus);
> +} 

That will be wanting some sort of synchronization
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