Dot not set RA_FLAG_EOF on single page files.
readahead_close() will be called if RA_FLAG_EOF is there on file close.
It detects readahead hit/miss, and adjust ra_expected_bytes correspondingly.
Single page files are uninteresting for it. Since near 40% desktop
files are <= 4k, this patch can reduce many useless readahead_close()
invocations.
Signed-off-by: Wu Fengguang <[email protected]>
---
--- linux-2.6.17-rc5-mm3.orig/mm/readahead.c
+++ linux-2.6.17-rc5-mm3/mm/readahead.c
@@ -1037,7 +1037,8 @@ static int ra_dispatch(struct file_ra_st
ra->readahead_index = eof_index;
if (ra->lookahead_index > eof_index)
ra->lookahead_index = eof_index;
- ra->flags |= RA_FLAG_EOF;
+ if (eof_index > 1)
+ ra->flags |= RA_FLAG_EOF;
}
/* Disable look-ahead for loopback file. */
--
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
