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| author | Peter Zijlstra <a.p.zijlstra@chello.nl> | 2010-05-18 10:50:41 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2010-05-18 18:35:48 +0200 |
| commit | ef60777c9abd999db5eb4e338aae3eb593ae8e10 (patch) | |
| tree | 2dee468a922ebea2241d1c1ec10e581d62bf2db6 /include/linux/perf_event.h | |
| parent | c7920614cebbf269a7c8397ff959a8dcf727465c (diff) | |
| download | lwn-ef60777c9abd999db5eb4e338aae3eb593ae8e10.tar.gz lwn-ef60777c9abd999db5eb4e338aae3eb593ae8e10.zip | |
perf: Optimize the perf_output() path by removing IRQ-disables
Since we can now assume there is only a single writer
to each buffer, we can remove per-cpu lock thingy and
use a simply nest-count to the same effect.
This removes the need to disable IRQs.
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'include/linux/perf_event.h')
| -rw-r--r-- | include/linux/perf_event.h | 5 |
1 files changed, 2 insertions, 3 deletions
diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h index 0b521fc8f5b0..f1f853a9d5eb 100644 --- a/include/linux/perf_event.h +++ b/include/linux/perf_event.h @@ -597,12 +597,12 @@ struct perf_mmap_data { atomic_t events; /* event_id limit */ atomic_long_t head; /* write position */ - atomic_long_t done_head; /* completed head */ - atomic_t lock; /* concurrent writes */ atomic_t wakeup; /* needs a wakeup */ atomic_t lost; /* nr records lost */ + atomic_t nest; /* nested writers */ + long watermark; /* wakeup watermark */ struct perf_event_mmap_page *user_page; @@ -807,7 +807,6 @@ struct perf_output_handle { unsigned long offset; int nmi; int sample; - int locked; }; #ifdef CONFIG_PERF_EVENTS |