linux-kernel - [tip:perf/x86] perf: Add pmu callbacks to track event mapping and unmapping

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Message-ID: <tip-1e0fb9ec679c9273a641f1d6f3d25ea47baef2bb@git.kernel.org>
Date:	Wed, 4 Feb 2015 06:42:17 -0800
From:	tip-bot for Andy Lutomirski <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	aarcange@...hat.com, tglx@...utronix.de, mingo@...nel.org,
	hpa@...or.com, paulus@...ba.org, linux-kernel@...r.kernel.org,
	torvalds@...ux-foundation.org, Valdis.Kletnieks@...edu,
	vince@...ter.net, hillf.zj@...baba-inc.com, peterz@...radead.org,
	luto@...capital.net, acme@...nel.org, keescook@...omium.org
Subject: [tip:perf/x86] perf:
  Add pmu callbacks to track event mapping and unmapping

Commit-ID:  1e0fb9ec679c9273a641f1d6f3d25ea47baef2bb
Gitweb:     http://git.kernel.org/tip/1e0fb9ec679c9273a641f1d6f3d25ea47baef2bb
Author:     Andy Lutomirski <luto@...capital.net>
AuthorDate: Fri, 24 Oct 2014 15:58:10 -0700
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Wed, 4 Feb 2015 12:10:45 +0100

perf: Add pmu callbacks to track event mapping and unmapping

Signed-off-by: Andy Lutomirski <luto@...capital.net>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Arnaldo Carvalho de Melo <acme@...nel.org>
Cc: Kees Cook <keescook@...omium.org>
Cc: Andrea Arcangeli <aarcange@...hat.com>
Cc: Vince Weaver <vince@...ter.net>
Cc: "hillf.zj" <hillf.zj@...baba-inc.com>
Cc: Valdis Kletnieks <Valdis.Kletnieks@...edu>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Link: http://lkml.kernel.org/r/266afcba1d1f91ea5501e4e16e94bbbc1a9339b6.1414190806.git.luto@amacapital.net
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 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 5cad0e6..3326200 100644
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -202,6 +202,13 @@ 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 7f2fbb8..cc14871 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -4293,6 +4293,9 @@ 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);
 }
 
 /*
@@ -4312,6 +4315,9 @@ 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))
@@ -4513,6 +4519,9 @@ 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;
 }
 
--
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