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authorPeter Zijlstra <peterz@infradead.org>2012-03-22 17:26:36 +0100
committerIngo Molnar <mingo@kernel.org>2012-03-23 09:52:16 +0100
commitc7206205d00ab375839bd6c7ddb247d600693c09 (patch)
tree24b9d66a5eaef77c1fc40bc8f6f28acfd167bf5b /kernel/events
parentc5bc437702b24817cabd65a6a57971ff91a7712c (diff)
downloadlinux-c7206205d00ab375839bd6c7ddb247d600693c09.tar.bz2
perf: Fix mmap_page capabilities and docs
Complete the syscall-less self-profiling feature and address all complaints, namely: - capabilities, so we can detect what is actually available at runtime Add a capabilities field to perf_event_mmap_page to indicate what is actually available for use. - on x86: RDPMC weirdness due to being 40/48 bits and not sign-extending properly. - ABI documentation as to how all this stuff works. Also improve the documentation for the new features. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Stephane Eranian <eranian@google.com> Cc: Vince Weaver <vweaver1@eecs.utk.edu> Cc: Arnaldo Carvalho de Melo <acme@infradead.org> Cc: Jiri Olsa <jolsa@redhat.com> Link: http://lkml.kernel.org/r/1332433596.2487.33.camel@twins Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/events')
-rw-r--r--kernel/events/core.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/kernel/events/core.c b/kernel/events/core.c
index c61234b1a988..dc3b05272511 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -3348,7 +3348,7 @@ static void calc_timer_values(struct perf_event *event,
*running = ctx_time - event->tstamp_running;
}
-void __weak perf_update_user_clock(struct perf_event_mmap_page *userpg, u64 now)
+void __weak arch_perf_update_userpage(struct perf_event_mmap_page *userpg, u64 now)
{
}
@@ -3398,7 +3398,7 @@ void perf_event_update_userpage(struct perf_event *event)
userpg->time_running = running +
atomic64_read(&event->child_total_time_running);
- perf_update_user_clock(userpg, now);
+ arch_perf_update_userpage(userpg, now);
barrier();
++userpg->lock;