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From: Andy Lutomirski <luto@amacapital.net>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Valdis Kletnieks <Valdis.Kletnieks@vt.edu>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	Paul Mackerras <paulus@samba.org>,
	Arnaldo Carvalho de Melo <acme@kernel.org>,
	Ingo Molnar <mingo@redhat.com>, Kees Cook <keescook@chromium.org>,
	Andrea Arcangeli <aarcange@redhat.com>,
	Vince Weaver <vince@deater.net>,
	"hillf.zj" <hillf.zj@alibaba-inc.com>,
	Andy Lutomirski <luto@amacapital.net>
Subject: [PATCH v2 5/8] perf: Add pmu callbacks to track event mapping and unmapping
Date: Fri, 24 Oct 2014 15:58:10 -0700
Message-ID: <266afcba1d1f91ea5501e4e16e94bbbc1a9339b6.1414190806.git.luto@amacapital.net> (raw)
In-Reply-To: <cover.1414190806.git.luto@amacapital.net>
In-Reply-To: <cover.1414190806.git.luto@amacapital.net>

Signed-off-by: Andy Lutomirski <luto@amacapital.net>
---
 include/linux/perf_event.h | 7 +++++++
 kernel/events/core.c       | 9 +++++++++
 2 files changed, 16 insertions(+)

diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
index 893a0d07986f..c93aff25a459 100644
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -207,6 +207,13 @@ struct pmu {
 	 */
 	int (*event_init)		(struct perf_event *event);
 
+	/*
+	 * Notification that the event was mapped or unmapped.  Called
+	 * in the context of the mapping task.
+	 */
+	void (*event_mapped)		(struct perf_event *event); /*optional*/
+	void (*event_unmapped)		(struct perf_event *event); /*optional*/
+
 #define PERF_EF_START	0x01		/* start the counter when adding    */
 #define PERF_EF_RELOAD	0x02		/* reload the counter when starting */
 #define PERF_EF_UPDATE	0x04		/* update the counter when stopping */
diff --git a/kernel/events/core.c b/kernel/events/core.c
index 2b02c9fda790..3b1ec69d189f 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -4139,6 +4139,9 @@ static void perf_mmap_open(struct vm_area_struct *vma)
 
 	atomic_inc(&event->mmap_count);
 	atomic_inc(&event->rb->mmap_count);
+
+	if (event->pmu->event_mapped)
+		event->pmu->event_mapped(event);
 }
 
 /*
@@ -4158,6 +4161,9 @@ static void perf_mmap_close(struct vm_area_struct *vma)
 	int mmap_locked = rb->mmap_locked;
 	unsigned long size = perf_data_size(rb);
 
+	if (event->pmu->event_unmapped)
+		event->pmu->event_unmapped(event);
+
 	atomic_dec(&rb->mmap_count);
 
 	if (!atomic_dec_and_mutex_lock(&event->mmap_count, &event->mmap_mutex))
@@ -4359,6 +4365,9 @@ unlock:
 	vma->vm_flags |= VM_DONTCOPY | VM_DONTEXPAND | VM_DONTDUMP;
 	vma->vm_ops = &perf_mmap_vmops;
 
+	if (event->pmu->event_mapped)
+		event->pmu->event_mapped(event);
+
 	return ret;
 }
 
-- 
1.9.3


  parent reply index

Thread overview: 33+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-10-24 22:58 [PATCH v2 0/8] CR4 handling improvements Andy Lutomirski
2014-10-24 22:58 ` [PATCH v2 1/8] perf: Clean up pmu::event_idx Andy Lutomirski
2014-10-24 22:58 ` [PATCH v2 2/8] x86: Clean up cr4 manipulation Andy Lutomirski
2014-11-01 19:56   ` Thomas Gleixner
2015-02-04 14:41   ` [tip:perf/x86] " tip-bot for Andy Lutomirski
2014-10-24 22:58 ` [PATCH v2 3/8] x86: Store a per-cpu shadow copy of CR4 Andy Lutomirski
2014-11-01 19:56   ` Thomas Gleixner
2015-02-04 14:41   ` [tip:perf/x86] " tip-bot for Andy Lutomirski
2014-10-24 22:58 ` [PATCH v2 4/8] x86: Add a comment clarifying LDT context switching Andy Lutomirski
2014-11-01 19:56   ` Thomas Gleixner
2015-02-04 14:41   ` [tip:perf/x86] " tip-bot for Andy Lutomirski
2014-10-24 22:58 ` Andy Lutomirski [this message]
2014-11-01 19:59   ` [PATCH v2 5/8] perf: Add pmu callbacks to track event mapping and unmapping Thomas Gleixner
2014-11-01 20:32     ` Andy Lutomirski
2014-11-01 20:39       ` Thomas Gleixner
2014-11-01 21:49         ` Andy Lutomirski
2014-11-01 22:10           ` Thomas Gleixner
2014-11-02 20:15             ` Andy Lutomirski
2015-02-04 14:42   ` [tip:perf/x86] " tip-bot for Andy Lutomirski
2014-10-24 22:58 ` [PATCH v2 6/8] perf: Pass the event to arch_perf_update_userpage Andy Lutomirski
2015-02-04 14:42   ` [tip:perf/x86] perf: Pass the event to arch_perf_update_userpage( ) tip-bot for Andy Lutomirski
2014-10-24 22:58 ` [PATCH v2 7/8] x86, perf: Only allow rdpmc if a perf_event is mapped Andy Lutomirski
2014-10-31 17:54   ` Paolo Bonzini
2014-10-31 18:25     ` Andy Lutomirski
2015-02-04 14:42   ` [tip:perf/x86] perf/x86: " tip-bot for Andy Lutomirski
2014-10-24 22:58 ` [PATCH v2 8/8] x86, perf: Add /sys/devices/cpu/rdpmc=2 to allow rdpmc for all tasks Andy Lutomirski
2015-02-04 14:43   ` [tip:perf/x86] perf/x86: Add /sys/devices/cpu/rdpmc= 2 " tip-bot for Andy Lutomirski
2014-10-31 15:09 ` [PATCH v2 0/8] CR4 handling improvements Peter Zijlstra
2014-10-31 17:09   ` Andy Lutomirski
2015-01-14  0:52   ` Andy Lutomirski
2015-01-22 22:42     ` Thomas Gleixner
2015-01-23  8:37       ` Peter Zijlstra
2014-11-12 23:38 ` Andy Lutomirski

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