diff options
| author | Uros Bizjak <[email protected]> | 2023-03-05 16:55:32 +0100 |
|---|---|---|
| committer | Steven Rostedt (Google) <[email protected]> | 2023-03-21 13:59:48 -0400 |
| commit | 8328e36da9cd8cb051394630e910cbb461f7e3ec (patch) | |
| tree | 35d10a2205d1f1ca0467cc06c0e27863352f8843 /tools/perf/scripts/python/Perf-Trace-Util/lib/Perf/Trace/SchedGui.py | |
| parent | bc92b9562abc831a65e505d2e675b51528d22d8b (diff) | |
ring_buffer: Use try_cmpxchg instead of cmpxchg
Use try_cmpxchg instead of cmpxchg (*ptr, old, new) == old.
x86 CMPXCHG instruction returns success in ZF flag, so this change
saves a compare after cmpxchg (and related move instruction in
front of cmpxchg).
Also, try_cmpxchg implicitly assigns old *ptr value to "old" when cmpxchg
fails. There is no need to re-read the value in the loop.
No functional change intended.
Link: https://lkml.kernel.org/r/[email protected]
Cc: Masami Hiramatsu <[email protected]>
Signed-off-by: Uros Bizjak <[email protected]>
Acked-by: Mukesh Ojha <[email protected]>
Signed-off-by: Steven Rostedt (Google) <[email protected]>
Diffstat (limited to 'tools/perf/scripts/python/Perf-Trace-Util/lib/Perf/Trace/SchedGui.py')
0 files changed, 0 insertions, 0 deletions