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authorWu Fengguang <fengguang.wu@intel.com>2009-06-16 15:31:30 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2009-06-16 19:47:29 -0700
commitd30a11004e3411909f2448546f036a011978062e (patch)
treec1980adb410d9fabd2c2eb8af9f0ed8ee4b656da /mm/readahead.c
parent2fad6f5deee5556f511eab58da78737a23ddb35d (diff)
downloadlinux-d30a11004e3411909f2448546f036a011978062e.tar.gz
readahead: record mmap read-around states in file_ra_state
Mmap read-around now shares the same code style and data structure with readahead code. This also removes do_page_cache_readahead(). Its last user, mmap read-around, has been changed to call ra_submit(). The no-readahead-if-congested logic is dumped by the way. Users will be pretty sensitive about the slow loading of executables. So it's unfavorable to disabled mmap read-around on a congested queue. [akpm@linux-foundation.org: coding-style fixes] Cc: Nick Piggin <npiggin@suse.de> Signed-off-by: Fengguang Wu <wfg@mail.ustc.edu.cn> Cc: Ying Han <yinghan@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/readahead.c')
-rw-r--r--mm/readahead.c23
1 files changed, 2 insertions, 21 deletions
diff --git a/mm/readahead.c b/mm/readahead.c
index d7c6e143a12..a7f01fcce9e 100644
--- a/mm/readahead.c
+++ b/mm/readahead.c
@@ -133,15 +133,12 @@ out:
}
/*
- * do_page_cache_readahead actually reads a chunk of disk. It allocates all
+ * __do_page_cache_readahead() actually reads a chunk of disk. It allocates all
* the pages first, then submits them all for I/O. This avoids the very bad
* behaviour which would occur if page allocations are causing VM writeback.
* We really don't want to intermingle reads and writes like that.
*
* Returns the number of pages requested, or the maximum amount of I/O allowed.
- *
- * do_page_cache_readahead() returns -1 if it encountered request queue
- * congestion.
*/
static int
__do_page_cache_readahead(struct address_space *mapping, struct file *filp,
@@ -232,22 +229,6 @@ int force_page_cache_readahead(struct address_space *mapping, struct file *filp,
}
/*
- * This version skips the IO if the queue is read-congested, and will tell the
- * block layer to abandon the readahead if request allocation would block.
- *
- * force_page_cache_readahead() will ignore queue congestion and will block on
- * request queues.
- */
-int do_page_cache_readahead(struct address_space *mapping, struct file *filp,
- pgoff_t offset, unsigned long nr_to_read)
-{
- if (bdi_read_congested(mapping->backing_dev_info))
- return -1;
-
- return __do_page_cache_readahead(mapping, filp, offset, nr_to_read, 0);
-}
-
-/*
* Given a desired number of PAGE_CACHE_SIZE readahead pages, return a
* sensible upper limit.
*/
@@ -260,7 +241,7 @@ unsigned long max_sane_readahead(unsigned long nr)
/*
* Submit IO for the read-ahead request in file_ra_state.
*/
-static unsigned long ra_submit(struct file_ra_state *ra,
+unsigned long ra_submit(struct file_ra_state *ra,
struct address_space *mapping, struct file *filp)
{
int actual;