From fa5881514ef9c9bcb29319aad85cf2d8889d91f1 Mon Sep 17 00:00:00 2001 From: Peter Zijlstra Date: Tue, 18 May 2010 10:54:20 +0200 Subject: 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 LKML-Reference: Signed-off-by: Ingo Molnar --- include/linux/perf_event.h | 15 +++++++-------- 1 file changed, 7 insertions(+), 8 deletions(-) (limited to 'include') diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h index f1f853a9d5eb..ce7667616fcb 100644 --- a/include/linux/perf_event.h +++ b/include/linux/perf_event.h @@ -485,6 +485,7 @@ struct perf_guest_info_callbacks { #include #include #include +#include #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 */ -- cgit v1.2.2