linux-kernel - Re: [RFC PATCH 2/3 v3] perf: Implement Nehalem uncore pmu

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Date:	Thu, 02 Dec 2010 13:57:46 +0800
From:	Lin Ming <ming.m.lin@...el.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Stephane Eranian <eranian@...gle.com>,
	Andi Kleen <andi@...stfloor.org>, Ingo Molnar <mingo@...e.hu>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Arjan van de Ven <arjan@...radead.org>,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH 2/3 v3] perf: Implement Nehalem uncore pmu

On Thu, 2010-12-02 at 13:20 +0800, Lin Ming wrote:
> Changelogs of v3:
> 
> - Allocate uncore data with kmalloc_node, like AMD NB stuff. (Peter
> Zijlstra)
> 
> - per-task uncore event is not allowed. Simply set pmu::task_ctx_nr =
> perf_invalid_context. (Peter Zijlstra)

<snip>

> +
> +static struct pmu uncore_pmu = {
> +	.event_init	= uncore_pmu_event_init,
> +	.add		= uncore_pmu_add,
> +	.del		= uncore_pmu_del,
> +	.start		= uncore_pmu_start,
> +	.stop		= uncore_pmu_stop,
> +	.read		= uncore_pmu_read,
> +};

Sorry, I send out an old version, need below additional code to disallow
per-task uncore event.

diff --git a/arch/x86/kernel/cpu/perf_event_intel_uncore.c b/arch/x86/kernel/cpu/perf_event_intel_uncore.c
index d2c10d8..d2a22ba 100644
--- a/arch/x86/kernel/cpu/perf_event_intel_uncore.c
+++ b/arch/x86/kernel/cpu/perf_event_intel_uncore.c
@@ -252,6 +252,8 @@ static void uncore_pmu_read(struct perf_event *event)
 }
 
 static struct pmu uncore_pmu = {
+	.task_ctx_nr	= perf_invalid_context, /* per-task uncore event is not allowed */
+
 	.event_init	= uncore_pmu_event_init,
 	.add		= uncore_pmu_add,
 	.del		= uncore_pmu_del,


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