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| author | Uros Bizjak <ubizjak@gmail.com> | 2022-10-18 16:51:54 +0200 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2022-11-08 17:37:13 -0800 |
| commit | 70ec04f3486103819807b061b50a99f6e1d2bf36 (patch) | |
| tree | 21d513186676f0f3b97bfacb075675b1733b45e4 /tools/perf/scripts/python/net_dropmonitor.py | |
| parent | 9fb6beea79c6e7c959adf4fb7b94cf9a6028b941 (diff) | |
| download | linux-70ec04f3486103819807b061b50a99f6e1d2bf36.tar.gz linux-70ec04f3486103819807b061b50a99f6e1d2bf36.zip | |
zram: use try_cmpxchg in update_used_max
Use try_cmpxchg instead of cmpxchg (*ptr, old, new) == old in
update_used_max. 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, reorder code a bit to remove additional compare and conditional jump
from the assembly code. Together, hese two changes save 15 bytes from the
function when compiled for x86_64.
No functional change intended.
Link: https://lkml.kernel.org/r/20221018145154.3699-1-ubizjak@gmail.com
Signed-off-by: Uros Bizjak <ubizjak@gmail.com>
Reviewed-by: Sergey Senozhatsky <senozhatsky@chromium.org>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Nitin Gupta <ngupta@vflare.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'tools/perf/scripts/python/net_dropmonitor.py')
0 files changed, 0 insertions, 0 deletions