diff options
| author | Steven Rostedt (VMware) | 2020-06-30 09:04:35 -0400 |
|---|---|---|
| committer | Steven Rostedt (VMware) | 2020-06-30 17:18:56 -0400 |
| commit | 75b21c6dfa2d816bcabac24a530d9cffc12092b8 (patch) | |
| tree | 6c12e434fe28cf3fa11b1ce13f2f42b33a42d833 /kernel/trace | |
| parent | b23d7a5f4a07af02343cdd28fe1f7488bac3afda (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')
| -rw-r--r-- | kernel/trace/ring_buffer.c | 2 |
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 */ |