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| author | Peter Zijlstra <a.p.zijlstra@chello.nl> | 2009-04-06 11:45:07 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-04-07 10:48:58 +0200 |
| commit | 79f146415623fe74f39af67c0f6adc208939a410 (patch) | |
| tree | 2b8b3ac045b21cce1169b55bd298a93dba4a19b3 /include/linux/perf_counter.h | |
| parent | 339f7c90b8a2f3aa2dd4267e79f797999e8a3c59 (diff) | |
| download | lwn-79f146415623fe74f39af67c0f6adc208939a410.tar.gz lwn-79f146415623fe74f39af67c0f6adc208939a410.zip | |
perf_counter: counter overflow limit
Provide means to auto-disable the counter after 'n' overflow events.
Create the counter with hw_event.disabled = 1, and then issue an
ioctl(fd, PREF_COUNTER_IOC_REFRESH, n); to set the limit and enable
the counter.
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: <20090406094518.083139737@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'include/linux/perf_counter.h')
| -rw-r--r-- | include/linux/perf_counter.h | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/include/linux/perf_counter.h b/include/linux/perf_counter.h index 928a7fae0961..ef4dcbff75ab 100644 --- a/include/linux/perf_counter.h +++ b/include/linux/perf_counter.h @@ -155,8 +155,9 @@ struct perf_counter_hw_event { /* * Ioctls that can be done on a perf counter fd: */ -#define PERF_COUNTER_IOC_ENABLE _IO('$', 0) -#define PERF_COUNTER_IOC_DISABLE _IO('$', 1) +#define PERF_COUNTER_IOC_ENABLE _IO ('$', 0) +#define PERF_COUNTER_IOC_DISABLE _IO ('$', 1) +#define PERF_COUNTER_IOC_REFRESH _IOW('$', 2, u32) /* * Structure of the page that can be mapped via mmap @@ -403,9 +404,14 @@ struct perf_counter { /* poll related */ wait_queue_head_t waitq; struct fasync_struct *fasync; - /* optional: for NMIs */ + + /* delayed work for NMIs and such */ + int pending_wakeup; + int pending_disable; struct perf_pending_entry pending; + atomic_t event_limit; + void (*destroy)(struct perf_counter *); struct rcu_head rcu_head; #endif |