[PATCH v8 1/5] perf: Add a counter for number of user access events in context
From: Rob Herring <robh@kernel.org>
Date: 2021-05-17 19:54:18
Also in:
lkml
Subsystem:
performance events subsystem, the rest · Maintainers:
Peter Zijlstra, Ingo Molnar, Arnaldo Carvalho de Melo, Namhyung Kim, Linus Torvalds
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 <robh@kernel.org> --- 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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