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Subject[PATCH 1/3] perf: comment on usage of perf_invalid_context
Date
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@linux.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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