Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=0bb7ba6b9c358c12084a3cbc6ac08c8d1e973937
Commit: 0bb7ba6b9c358c12084a3cbc6ac08c8d1e973937
Parent: 937085aa35cc873d427d250a1e304d641af24628
Author: Fengguang Wu <[EMAIL PROTECTED]>
AuthorDate: Tue Oct 16 01:24:32 2007 -0700
Committer: Linus Torvalds <[EMAIL PROTECTED]>
CommitDate: Tue Oct 16 09:42:52 2007 -0700
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 <[EMAIL PROTECTED]>
Cc: Rusty Russell <[EMAIL PROTECTED]>
Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
Signed-off-by: Linus Torvalds <[EMAIL PROTECTED]>
---
include/linux/fs.h | 3 +--
mm/filemap.c | 4 ++--
2 files changed, 3 insertions(+), 4 deletions(-)
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 7a998c4..8250811 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -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 */
};
diff --git a/mm/filemap.c b/mm/filemap.c
index 15c8413..5dc18d7 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -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
-
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