By request, provide a way to request a wakeup every 'n' events instead of every page of output. Signed-off-by: Peter Zijlstra --- include/linux/perf_counter.h | 3 ++- kernel/perf_counter.c | 10 +++++++++- 2 files changed, 11 insertions(+), 2 deletions(-) Index: linux-2.6/include/linux/perf_counter.h =================================================================== --- linux-2.6.orig/include/linux/perf_counter.h +++ linux-2.6/include/linux/perf_counter.h @@ -146,7 +146,7 @@ struct perf_counter_hw_event { __reserved_1 : 52; __u32 extra_config_len; - __u32 __reserved_4; + __u32 wakeup_events; /* wakeup every n events */ /* * Singleshot signal information. @@ -327,6 +327,7 @@ struct perf_mmap_data { int nr_pages; atomic_t wakeup; atomic_t head; + atomic_t events; struct perf_counter_mmap_page *user_page; void *data_pages[0]; }; Index: linux-2.6/kernel/perf_counter.c =================================================================== --- linux-2.6.orig/kernel/perf_counter.c +++ linux-2.6/kernel/perf_counter.c @@ -1760,7 +1760,15 @@ static void perf_output_copy(struct perf static void perf_output_end(struct perf_output_handle *handle) { - if (handle->wakeup) + int wakeup_events = handle->counter->hw_event.wakeup_events; + + if (wakeup_events) { + int events = atomic_inc_return(&handle->data->events); + if (events >= wakeup_events) { + atomic_sub(wakeup_events, &handle->data->events); + __perf_output_wakeup(handle); + } + } else if (handle->wakeup) __perf_output_wakeup(handle); rcu_read_unlock(); } -- -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/