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readahead: mmap read-around simplification 

Fold file_ra_state.mmap_hit into file_ra_state.mmap_miss and make it an int.

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>
This commit is contained in:
Fengguang Wu 2007-10-16 01:24:32 -07:00 committed by Linus Torvalds
parent 937085aa35
commit 0bb7ba6b9c
2 changed files with 3 additions and 4 deletions
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3
include/linux/fs.h
View File

@ -703,8 +703,7 @@ struct file_ra_state {
there are only # of pages ahead */
unsigned int ra_pages; /* Maximum readahead window */
unsigned long mmap_hit; /* Cache hit stat for mmap accesses */
unsigned long mmap_miss; /* Cache miss stat for mmap accesses */
int mmap_miss; /* Cache miss stat for mmap accesses */
unsigned long prev_index; /* Cache last read() position */
unsigned int prev_offset; /* Offset where last read() ended in a page */
};

4
mm/filemap.c
View File

@ -1349,7 +1349,7 @@ retry_find:
* Do we miss much more than hit in this file? If so,
* stop bothering with read-ahead. It will only hurt.
*/
if (ra->mmap_miss > ra->mmap_hit + MMAP_LOTSAMISS)
if (ra->mmap_miss > MMAP_LOTSAMISS)
goto no_cached_page;
/*
@ -1375,7 +1375,7 @@ retry_find:
}
if (!did_readaround)
ra->mmap_hit++;
ra->mmap_miss--;
/*
* We have a locked page in the page cache, now we need to check