diff options
| author | Peter Zijlstra <a.p.zijlstra@chello.nl> | 2009-04-08 15:01:29 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-04-08 18:53:29 +0200 |
| commit | 8740f9418c78dcad694b46ab25d1645d5aef1f5e (patch) | |
| tree | 877e35686a93c7430b9574a3e8d083f0cbe51659 | |
| parent | 808382b33bb4c60df6379ec2db39f332cc56b82a (diff) | |
perf_counter: add some comments
Add a few comments because I was forgetting what field what for what
functionality.
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
LKML-Reference: <20090408130409.036984214@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
| -rw-r--r-- | include/linux/perf_counter.h | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/include/linux/perf_counter.h b/include/linux/perf_counter.h index 4809ae18a94..8bf764fc622 100644 --- a/include/linux/perf_counter.h +++ b/include/linux/perf_counter.h @@ -344,10 +344,12 @@ struct file; struct perf_mmap_data { struct rcu_head rcu_head; - int nr_pages; - atomic_t wakeup; - atomic_t head; - atomic_t events; + int nr_pages; /* nr of data pages */ + + atomic_t wakeup; /* POLL_ for wakeups */ + atomic_t head; /* write position */ + atomic_t events; /* event limit */ + struct perf_counter_mmap_page *user_page; void *data_pages[0]; }; |