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| author | Fengguang Wu <wfg@mail.ustc.edu.cn> | 2007-07-19 04:48:05 -0400 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-07-19 13:04:44 -0400 |
| commit | 431a4820bfcdf7ff530e745230bafb06c9bf2d6d (patch) | |
| tree | 0b2396609deec8da5697979bce4c8ee18af254e6 /lib/gen_crc32table.c | |
| parent | c743d96b6d2ff55a94df7b5ac7c74987bb9c343b (diff) | |
readahead: move synchronous readahead call out of splice loop
Move synchronous page_cache_readahead_ondemand() call out of splice loop.
This avoids one pointless page allocation/insertion in case of non-zero
ra_pages, or many pointless readahead calls in case of zero ra_pages.
Note that if a user sets ra_pages to less than PIPE_BUFFERS=16 pages, he will
not get expected readahead behavior anyway. The splice code works in batches
of 16 pages, which can be taken as another form of synchronous readahead.
Signed-off-by: Fengguang Wu <wfg@mail.ustc.edu.cn>
Cc: Jens Axboe <jens.axboe@oracle.com>
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 'lib/gen_crc32table.c')
0 files changed, 0 insertions, 0 deletions