Subject: [PATCH v8 1/5] perf: Add a counter for number of user access events in context

From: Rob Herring <[email-masked]>
Date: Mon, 17 May 2021 14:54:01 -0500

When scheduling a task's context, we need to know if the task has any
user accessible events in order to enable or disable user access.
Walking the context's list of events would be slow, so add a counter
to track this.

Signed-off-by: Rob Herring <[email-masked]>
---
 include/linux/perf_event.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
index f5a6a2f069ed..4cf081e22b76 100644
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -822,6 +822,7 @@ struct perf_event_context {
 	int				nr_stat;
 	int				nr_freq;
 	int				rotate_disable;
+	atomic_t			nr_user;
 	/*
 	 * Set when nr_events != nr_active, except tolerant to events not
 	 * necessary to be active due to scheduling constraints, such as cgroups.
-- 
2.27.0

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