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| author | Alexey Dobriyan <adobriyan@gmail.com> | 2018-02-06 15:37:28 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2018-02-06 18:32:43 -0800 |
| commit | 15b158b4e6274351fc3cf652cbabc57104efb547 (patch) | |
| tree | b39beb6e526de60b5a89bd27c5419f7fbd7ead3d /lib/ubsan.h | |
| parent | efb1a57d90cae6af1ddd32f1b920c924a711aba5 (diff) | |
| download | linux-15b158b4e6274351fc3cf652cbabc57104efb547.tar.bz2 | |
proc: spread likely/unlikely a bit
use_pde() is used at every open/read/write/... of every random /proc
file. Negative refcount happens only if PDE is being deleted by module
(read: never). So it gets "likely".
unuse_pde() gets "unlikely" for the same reason.
close_pdeo() gets unlikely as the completion is filled only if there is a
race between PDE removal and close() (read: never ever).
It even saves code on x86_64 defconfig:
add/remove: 0/0 grow/shrink: 1/2 up/down: 2/-20 (-18)
Function old new delta
close_pdeo 183 185 +2
proc_reg_get_unmapped_area 119 111 -8
proc_reg_poll 85 73 -12
Link: http://lkml.kernel.org/r/20180104175657.GA5204@avx2
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'lib/ubsan.h')
0 files changed, 0 insertions, 0 deletions