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authorSteven Rostedt (VMware) <rostedt@goodmis.org>2020-06-30 09:04:35 -0400
committerSteven Rostedt (VMware) <rostedt@goodmis.org>2020-06-30 17:18:56 -0400
commit75b21c6dfa2d816bcabac24a530d9cffc12092b8 (patch)
tree6c12e434fe28cf3fa11b1ce13f2f42b33a42d833 /kernel/trace/ring_buffer.c
parentb23d7a5f4a07af02343cdd28fe1f7488bac3afda (diff)
ring-buffer: Mark the !tail (crossing a page) as unlikely
It is the uncommon case where an event crosses a sub buffer boundary (page) mark that check at the end of reserving an event as unlikely. Suggested-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Diffstat (limited to 'kernel/trace/ring_buffer.c')
-rw-r--r--kernel/trace/ring_buffer.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c
index ed1941304f69..888bc9177937 100644
--- a/kernel/trace/ring_buffer.c
+++ b/kernel/trace/ring_buffer.c
@@ -3260,7 +3260,7 @@ __rb_reserve_next(struct ring_buffer_per_cpu *cpu_buffer,
* If this is the first commit on the page, then update
* its timestamp.
*/
- if (!tail)
+ if (unlikely(!tail))
tail_page->page->time_stamp = info->ts;
/* account for these added bytes */