diff options
| author | Peter Zijlstra <a.p.zijlstra@chello.nl> | 2010-05-18 10:54:20 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2010-05-18 18:35:49 +0200 |
| commit | fa5881514ef9c9bcb29319aad85cf2d8889d91f1 (patch) | |
| tree | 4ca8bc35591b05adc8556358fb91498d2057c394 /include/linux/perf_event.h | |
| parent | ef60777c9abd999db5eb4e338aae3eb593ae8e10 (diff) | |
perf: Optimize the hotpath by converting the perf output buffer to local_t
Since there is now only a single writer, we can use
local_t instead and avoid all these pesky LOCK insn.
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
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 | 15 |
1 files changed, 7 insertions, 8 deletions
diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h index f1f853a9d5e..ce7667616fc 100644 --- a/include/linux/perf_event.h +++ b/include/linux/perf_event.h @@ -485,6 +485,7 @@ struct perf_guest_info_callbacks { #include <linux/ftrace.h> #include <linux/cpu.h> #include <asm/atomic.h> +#include <asm/local.h> #define PERF_MAX_STACK_DEPTH 255 @@ -588,20 +589,18 @@ struct perf_mmap_data { #ifdef CONFIG_PERF_USE_VMALLOC struct work_struct work; #endif - int data_order; + int data_order; /* allocation order */ int nr_pages; /* nr of data pages */ int writable; /* are we writable */ int nr_locked; /* nr pages mlocked */ atomic_t poll; /* POLL_ for wakeups */ - atomic_t events; /* event_id limit */ - atomic_long_t head; /* write position */ - - atomic_t wakeup; /* needs a wakeup */ - atomic_t lost; /* nr records lost */ - - atomic_t nest; /* nested writers */ + local_t head; /* write position */ + local_t nest; /* nested writers */ + local_t events; /* event limit */ + local_t wakeup; /* needs a wakeup */ + local_t lost; /* nr records lost */ long watermark; /* wakeup watermark */ |