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| author |   Uros Bizjak <ubizjak@gmail.com> | 2023-09-14 18:34:02 +0200 |
|---|---|---|
| committer |   Steven Rostedt (Google) <rostedt@goodmis.org> | 2023-10-03 21:44:38 -0400 |
| commit | bdf4fb628093b4ab2f4eb312256233a2ae0594b7 (patch) | |
| tree | 2935e2509d51097ed3eb9be16b1038f60f0a0049 /tools/perf/scripts/python/call-graph-from-postgresql.py | |
| parent | tracing: Expand all ring buffers individually (diff) | |
| download | wireguard-linux-bdf4fb628093b4ab2f4eb312256233a2ae0594b7.tar.xz wireguard-linux-bdf4fb628093b4ab2f4eb312256233a2ae0594b7.zip | |
ring_buffer: Use try_cmpxchg instead of cmpxchg in rb_insert_pages
Use try_cmpxchg instead of cmpxchg (*ptr, old, new) == old in
rb_insert_pages. x86 CMPXCHG instruction returns success in ZF flag,
so this change saves a compare after cmpxchg (and related move
instruction in front of cmpxchg).
No functional change intended.
Link: https://lore.kernel.org/linux-trace-kernel/20230914163420.12923-1-ubizjak@gmail.com
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Uros Bizjak <ubizjak@gmail.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Diffstat (limited to 'tools/perf/scripts/python/call-graph-from-postgresql.py')
0 files changed, 0 insertions, 0 deletions