Commit-ID: 6de6a7b95705b859b61430fa3afa1403034eb3e6 Gitweb: http://git.kernel.org/tip/6de6a7b95705b859b61430fa3afa1403034eb3e6 Author: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx> AuthorDate: Tue, 5 May 2009 17:50:23 +0200 Committer: Ingo Molnar <mingo@xxxxxxx> CommitDate: Tue, 5 May 2009 20:18:31 +0200 perf_counter: add ioctl(PERF_COUNTER_IOC_RESET) Provide a way to reset an existing counter - this eases PAPI libraries around perfcounters. Similar to read() it doesn't collapse pending child counters. [ Impact: new perfcounter fd ioctl method to reset counters ] Suggested-by: Corey Ashford <cjashfor@xxxxxxxxxxxxxxxxxx> Signed-off-by: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx> Cc: Paul Mackerras <paulus@xxxxxxxxx> LKML-Reference: <20090505155437.022272933@xxxxxxxxx> Signed-off-by: Ingo Molnar <mingo@xxxxxxx> --- include/linux/perf_counter.h | 1 + kernel/perf_counter.c | 8 ++++++++ 2 files changed, 9 insertions(+), 0 deletions(-) diff --git a/include/linux/perf_counter.h b/include/linux/perf_counter.h index 17b6310..0fcbf34 100644 --- a/include/linux/perf_counter.h +++ b/include/linux/perf_counter.h @@ -160,6 +160,7 @@ struct perf_counter_hw_event { #define PERF_COUNTER_IOC_ENABLE _IO ('$', 0) #define PERF_COUNTER_IOC_DISABLE _IO ('$', 1) #define PERF_COUNTER_IOC_REFRESH _IOW('$', 2, u32) +#define PERF_COUNTER_IOC_RESET _IO ('$', 3) /* * Structure of the page that can be mapped via mmap diff --git a/kernel/perf_counter.c b/kernel/perf_counter.c index ba5e921..6e6834e 100644 --- a/kernel/perf_counter.c +++ b/kernel/perf_counter.c @@ -1288,6 +1288,11 @@ static unsigned int perf_poll(struct file *file, poll_table *wait) return events; } +static void perf_counter_reset(struct perf_counter *counter) +{ + atomic_set(&counter->count, 0); +} + static long perf_ioctl(struct file *file, unsigned int cmd, unsigned long arg) { struct perf_counter *counter = file->private_data; @@ -1303,6 +1308,9 @@ static long perf_ioctl(struct file *file, unsigned int cmd, unsigned long arg) case PERF_COUNTER_IOC_REFRESH: perf_counter_refresh(counter, arg); break; + case PERF_COUNTER_IOC_RESET: + perf_counter_reset(counter); + break; default: err = -ENOTTY; } -- To unsubscribe from this list: send the line "unsubscribe linux-tip-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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