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 [thread overview]
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
next prev parent reply other threads:[~2014-10-24 22:59 UTC|newest]
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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=266afcba1d1f91ea5501e4e16e94bbbc1a9339b6.1414190806.git.luto@amacapital.net \
--to=luto@amacapital.net \
--cc=Valdis.Kletnieks@vt.edu \
--cc=aarcange@redhat.com \
--cc=acme@kernel.org \
--cc=hillf.zj@alibaba-inc.com \
--cc=keescook@chromium.org \
--cc=linux-kernel@vger.kernel.org \
--cc=mingo@redhat.com \
--cc=paulus@samba.org \
--cc=peterz@infradead.org \
--cc=vince@deater.net \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).