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| author | Steven Rostedt | 2011-01-14 00:46:17 +0100 |
|---|---|---|
| committer | Linus Torvalds | 2011-01-14 02:32:36 +0100 |
| commit | e20e87795834f2f14cb53baf657b91d9c39f92c8 (patch) | |
| tree | 0ec2c10b0ed4cb572c73153b56c017db536bc056 /mm/filemap.c | |
| parent | mm: remove likely() from mapping_unevictable() (diff) | |
| download | kernel-qcow2-linux-e20e87795834f2f14cb53baf657b91d9c39f92c8.tar.gz kernel-qcow2-linux-e20e87795834f2f14cb53baf657b91d9c39f92c8.tar.xz kernel-qcow2-linux-e20e87795834f2f14cb53baf657b91d9c39f92c8.zip | |
mm: remove unlikely() from page_mapping()
page_mapping() has a unlikely that the mapping has PAGE_MAPPING_ANON set.
But running the annotated branch profiler on a normal desktop system doing
vairous tasks (xchat, evolution, firefox, distcc), it is not really that
unlikely that the mapping here will have the PAGE_MAPPING_ANON flag set:
correct incorrect % Function File Line
------- --------- - -------- ---- ----
35935762 1270265395 97 page_mapping mm.h 659
1306198001 143659 0 page_mapping mm.h 657
203131478 121586 0 page_mapping mm.h 657
5415491 1116 0 page_mapping mm.h 657
74899487 1116 0 page_mapping mm.h 657
203132845 224 0 page_mapping mm.h 659
5415464 27 0 page_mapping mm.h 659
13552 0 0 page_mapping mm.h 657
13552 0 0 page_mapping mm.h 659
242630 0 0 page_mapping mm.h 657
242630 0 0 page_mapping mm.h 659
74899487 0 0 page_mapping mm.h 659
The page_mapping() is a static inline, which is why it shows up multiple
times.
The unlikely in page_mapping() was correct a total of 1909540379 times and
incorrect 1270533123 times, with a 39% being incorrect. With this much of
an error, it's best to simply remove the unlikely and have the compiler
and branch prediction figure this out.
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Nick Piggin <npiggin@kernel.dk>
Cc: Rik van Riel <riel@redhat.com>
Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/filemap.c')
0 files changed, 0 insertions, 0 deletions