The patch titled
Subject: mm/readahead.c: simplify get_next_ra_size()
has been added to the -mm tree. Its filename is
mm-simplify-get_next_ra_size.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-simplify-get_next_ra_size.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-simplify-get_next_ra_size.patch
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------------------------------------------------------
From: Gao Xiang <hsiangkao@xxxxxxx>
Subject: mm/readahead.c: simplify get_next_ra_size()
It's a trivial simplification for get_next_ra_size() and clear enough for
humans to understand.
It also fixes potential overflow if ra->size(< ra_pages) is too large.
Link: http://lkml.kernel.org/r/1540707206-19649-1-git-send-email-hsiangkao@xxxxxxx
Signed-off-by: Gao Xiang <hsiangkao@xxxxxxx>
Reviewed-by: Fengguang Wu <fengguang.wu@xxxxxxxxx>
Reviewed-by: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/readahead.c | 12 +++++-------
1 file changed, 5 insertions(+), 7 deletions(-)
--- a/mm/readahead.c~mm-simplify-get_next_ra_size
+++ a/mm/readahead.c
@@ -270,17 +270,15 @@ static unsigned long get_init_ra_size(un
* return it as the new window size.
*/
static unsigned long get_next_ra_size(struct file_ra_state *ra,
- unsigned long max)
+ unsigned long max)
{
unsigned long cur = ra->size;
- unsigned long newsize;
if (cur < max / 16)
- newsize = 4 * cur;
- else
- newsize = 2 * cur;
-
- return min(newsize, max);
+ return 4 * cur;
+ if (cur <= max / 2)
+ return 2 * cur;
+ return max;
}
/*
_
Patches currently in -mm which might be from hsiangkao@xxxxxxx are
mm-simplify-get_next_ra_size.patch
