diff options
| author |   Peter Zijlstra <a.p.zijlstra@chello.nl> | 2010-05-20 19:50:07 +0200 |
|---|---|---|
| committer |   Ingo Molnar <mingo@elte.hu> | 2010-05-21 11:37:59 +0200 |
| commit | a94ffaaf55552769af328eaca9260fe6291c66c7 (patch) | |
| tree | 39339b21a962b50c6f8be09786fcb41cdc4a8459 /kernel | |
| parent | perf: Optimize the !vmalloc backed buffer (diff) | |
| download | linux-dev-a94ffaaf55552769af328eaca9260fe6291c66c7.tar.xz linux-dev-a94ffaaf55552769af328eaca9260fe6291c66c7.zip | |
perf: Remove more code from the fastpath
Sanity checks cost instructions.
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Steven Rostedt <rostedt@goodmis.org>
LKML-Reference: <20100521090710.852926930@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/perf_event.c | 20 |
1 files changed, 4 insertions, 16 deletions
diff --git a/kernel/perf_event.c b/kernel/perf_event.c index 953ce46d7b2f..d25c864cadbf 100644 --- a/kernel/perf_event.c +++ b/kernel/perf_event.c @@ -2967,20 +2967,11 @@ again: preempt_enable(); } -void perf_output_copy(struct perf_output_handle *handle, +__always_inline void perf_output_copy(struct perf_output_handle *handle, const void *buf, unsigned int len) { - handle->offset += len; - - /* - * Check we didn't copy past our reservation window, taking the - * possible unsigned int wrap into account. - */ - if (WARN_ON_ONCE(((long)(handle->head - handle->offset)) < 0)) - return; - do { - unsigned long size = min(handle->size, len); + unsigned long size = min_t(unsigned long, handle->size, len); memcpy(handle->addr, buf, size); @@ -3055,15 +3046,12 @@ int perf_output_begin(struct perf_output_handle *handle, goto fail; } while (local_cmpxchg(&data->head, offset, head) != offset); - handle->offset = offset; - handle->head = head; - if (head - local_read(&data->wakeup) > data->watermark) local_add(data->watermark, &data->wakeup); - handle->page = handle->offset >> (PAGE_SHIFT + page_order(data)); + handle->page = offset >> (PAGE_SHIFT + page_order(data)); handle->page &= data->nr_pages - 1; - handle->size = handle->offset & ((PAGE_SIZE << page_order(data)) - 1); + handle->size = offset & ((PAGE_SIZE << page_order(data)) - 1); handle->addr = data->data_pages[handle->page]; handle->addr += handle->size; handle->size = (PAGE_SIZE << page_order(data)) - handle->size; |