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| author | Fengguang Wu <wfg@mail.ustc.edu.cn> | 2007-10-16 10:24:35 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-10-16 18:42:52 +0200 |
| commit | 7ff81078d8b9f3d05a27b7bd3786ffb1ef1b0d1f (patch) | |
| tree | ac73cf0c8325783a28c4d16c783f6fd96d17be7c /mm/readahead.c | |
| parent | readahead: basic support of interleaved reads (diff) | |
| download | linux-7ff81078d8b9f3d05a27b7bd3786ffb1ef1b0d1f.tar.xz linux-7ff81078d8b9f3d05a27b7bd3786ffb1ef1b0d1f.zip | |
readahead: remove the local copy of ra in do_generic_mapping_read()
The local copy of ra in do_generic_mapping_read() can now go away.
It predates readanead(req_size). In a time when the readahead code was called
on *every* single page. Hence a local has to be made to reduce the chance of
the readahead state being overwritten by a concurrent reader. More details
in: Linux: Random File I/O Regressions In 2.6
<http://kerneltrap.org/node/3039>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>
Signed-off-by: Fengguang Wu <wfg@mail.ustc.edu.cn>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/readahead.c')
0 files changed, 0 insertions, 0 deletions