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From: Rob Herring <robh@kernel.org>
To: Will Deacon <will@kernel.org>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Peter Zijlstra <peterz@infradead.org>,
	Ingo Molnar <mingo@redhat.com>,
	Mark Rutland <mark.rutland@arm.com>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>,
	Jiri Olsa <jolsa@redhat.com>,
	Kan Liang <kan.liang@linux.intel.com>,
	Ian Rogers <irogers@google.com>,
	Alexander Shishkin <alexander.shishkin@linux.intel.com>,
	honnappa.nagarahalli@arm.com, Zachary.Leaf@arm.com,
	Raphael Gault <raphael.gault@arm.com>,
	Jonathan Cameron <Jonathan.Cameron@huawei.com>,
	Namhyung Kim <namhyung@kernel.org>,
	Itaru Kitayama <itaru.kitayama@gmail.com>,
	linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org
Subject: [PATCH v8 1/5] perf: Add a counter for number of user access events in context
Date: Mon, 17 May 2021 14:54:01 -0500	[thread overview]
Message-ID: <20210517195405.3079458-2-robh@kernel.org> (raw)
In-Reply-To: <20210517195405.3079458-1-robh@kernel.org>

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


WARNING: multiple messages have this Message-ID (diff)
From: Rob Herring <robh@kernel.org>
To: Will Deacon <will@kernel.org>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Peter Zijlstra <peterz@infradead.org>,
	Ingo Molnar <mingo@redhat.com>,
	Mark Rutland <mark.rutland@arm.com>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>,
	Jiri Olsa <jolsa@redhat.com>,
	Kan Liang <kan.liang@linux.intel.com>,
	Ian Rogers <irogers@google.com>,
	Alexander Shishkin <alexander.shishkin@linux.intel.com>,
	honnappa.nagarahalli@arm.com, Zachary.Leaf@arm.com,
	Raphael Gault <raphael.gault@arm.com>,
	Jonathan Cameron <Jonathan.Cameron@huawei.com>,
	Namhyung Kim <namhyung@kernel.org>,
	Itaru Kitayama <itaru.kitayama@gmail.com>,
	linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org
Subject: [PATCH v8 1/5] perf: Add a counter for number of user access events in context
Date: Mon, 17 May 2021 14:54:01 -0500	[thread overview]
Message-ID: <20210517195405.3079458-2-robh@kernel.org> (raw)
In-Reply-To: <20210517195405.3079458-1-robh@kernel.org>

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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  reply	other threads:[~2021-05-17 19:54 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-05-17 19:54 [PATCH v8 0/5] arm64 userspace counter support Rob Herring
2021-05-17 19:54 ` Rob Herring
2021-05-17 19:54 ` Rob Herring [this message]
2021-05-17 19:54   ` [PATCH v8 1/5] perf: Add a counter for number of user access events in context Rob Herring
2021-05-17 19:54 ` [PATCH v8 2/5] perf: Track per-PMU sched_task() callback users Rob Herring
2021-05-17 19:54   ` Rob Herring
2021-05-17 19:54 ` [PATCH v8 3/5] arm64: perf: Enable PMU counter userspace access for perf event Rob Herring
2021-05-17 19:54   ` Rob Herring
2021-06-01 13:55   ` Mark Rutland
2021-06-01 13:55     ` Mark Rutland
2021-06-01 15:00     ` Rob Herring
2021-06-01 15:00       ` Rob Herring
2021-06-01 17:11       ` Mark Rutland
2021-06-01 17:11         ` Mark Rutland
2021-06-03 16:40         ` Rob Herring
2021-06-03 16:40           ` Rob Herring
2021-07-21 15:59         ` Rob Herring
2021-07-21 15:59           ` Rob Herring
2021-05-17 19:54 ` [PATCH v8 4/5] arm64: perf: Add userspace counter access disable switch Rob Herring
2021-05-17 19:54   ` Rob Herring
2021-06-01 12:57   ` Will Deacon
2021-06-01 12:57     ` Will Deacon
2021-05-17 19:54 ` [PATCH v8 5/5] Documentation: arm64: Document PMU counters access from userspace Rob Herring
2021-05-17 19:54   ` Rob Herring

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