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authorPeter Zijlstra <a.p.zijlstra@chello.nl>2010-05-20 19:50:07 +0200
committerIngo Molnar <mingo@elte.hu>2010-05-21 11:37:59 +0200
commita94ffaaf55552769af328eaca9260fe6291c66c7 (patch)
tree39339b21a962b50c6f8be09786fcb41cdc4a8459 /kernel
parent3cafa9fbb5c1d564b7b8e7224f493effbf04ffee (diff)
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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.c20
1 files changed, 4 insertions, 16 deletions
diff --git a/kernel/perf_event.c b/kernel/perf_event.c
index 953ce46d7b2..d25c864cadb 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;