diff options
| author |   Peter Zijlstra <a.p.zijlstra@chello.nl> | 2009-06-02 16:16:02 +0200 |
|---|---|---|
| committer |   Ingo Molnar <mingo@elte.hu> | 2009-06-02 21:45:32 +0200 |
| commit | 8e3747c13c39246c7e46def7cf495d9d21d4c5f9 (patch) | |
| tree | 6a57736dd784947dbd40b75674effcb63e6696a1 /include/linux/perf_counter.h | |
| parent | perf_counter: x86: Emulate longer sample periods (diff) | |
| download | linux-dev-8e3747c13c39246c7e46def7cf495d9d21d4c5f9.tar.xz linux-dev-8e3747c13c39246c7e46def7cf495d9d21d4c5f9.zip | |
perf_counter: Change data head from u32 to u64
Since some people worried that 4G might not be a large enough
as an mmap data window, extend it to 64 bit for capable
platforms.
Reported-by: Stephane Eranian <eranian@googlemail.com>
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_counter.h')
| -rw-r--r-- | include/linux/perf_counter.h | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/include/linux/perf_counter.h b/include/linux/perf_counter.h index cef9931793fd..c046f7d97cfa 100644 --- a/include/linux/perf_counter.h +++ b/include/linux/perf_counter.h @@ -212,7 +212,7 @@ struct perf_counter_mmap_page { * User-space reading this value should issue an rmb(), on SMP capable * platforms, after reading this value -- see perf_counter_wakeup(). */ - __u32 data_head; /* head in the data section */ + __u64 data_head; /* head in the data section */ }; #define PERF_EVENT_MISC_CPUMODE_MASK (3 << 0) @@ -397,10 +397,11 @@ struct perf_mmap_data { int nr_locked; /* nr pages mlocked */ atomic_t poll; /* POLL_ for wakeups */ - atomic_t head; /* write position */ atomic_t events; /* event limit */ - atomic_t done_head; /* completed head */ + atomic_long_t head; /* write position */ + atomic_long_t done_head; /* completed head */ + atomic_t lock; /* concurrent writes */ atomic_t wakeup; /* needs a wakeup */ |