linux-kernel - [PATCH 1/3] perf: comment on usage of perf_invalid

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Date:	Thu,  9 Jan 2014 15:51:30 -0800
From:	Cody P Schafer <cody@...ux.vnet.ibm.com>
To:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Peter Zijlstra <peterz@...radead.org>,
	Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...hat.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Cody P Schafer <cody@...ux.vnet.ibm.com>
Subject: [PATCH 1/3] perf: comment on usage of perf_invalid_context

Context numbers less than 0 are treated specially within the events
code, add a comment to document this.

Signed-off-by: Cody P Schafer <cody@...ux.vnet.ibm.com>
---
 include/linux/sched.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/include/linux/sched.h b/include/linux/sched.h
index 53f97eb..f574820 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1033,6 +1033,10 @@ struct sched_rt_entity {
 struct rcu_node;
 
 enum perf_event_task_context {
+	/*
+	 * When <0, allocate a pmu local pmu->pmu_cpu_context (instead
+	 * of sharing among pmus in the same context) and forbid task tracking.
+	 */
 	perf_invalid_context = -1,
 	perf_hw_context = 0,
 	perf_sw_context,
-- 
1.8.5.2

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