The patch titled
readahead: loop case
has been removed from the -mm tree. Its filename is
readahead-loop-case.patch
This patch was probably dropped from -mm because
it has now been merged into a subsystem tree or
into Linus's tree, or because it was folded into
its parent patch in the -mm tree.
------------------------------------------------------
Subject: readahead: loop case
From: Wu Fengguang <wfg@xxxxxxxxxxxxxxxx>
Disable look-ahead for loop file.
Loopback files normally contain filesystems, in which case there are already
proper look-aheads in the upper layer, more look-aheads on the loopback file
only ruins the read-ahead hit rate.
Signed-off-by: Wu Fengguang <wfg@xxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
drivers/block/loop.c | 6 ++++++
1 files changed, 6 insertions(+)
diff -puN drivers/block/loop.c~readahead-loop-case drivers/block/loop.c
--- 25/drivers/block/loop.c~readahead-loop-case Fri May 26 13:34:39 2006
+++ 25-akpm/drivers/block/loop.c Fri May 26 13:34:39 2006
@@ -779,6 +779,12 @@ static int loop_set_fd(struct loop_devic
mapping = file->f_mapping;
inode = mapping->host;
+ /*
+ * The upper layer should already do proper look-ahead,
+ * one more look-ahead here only ruins the cache hit rate.
+ */
+ file->f_ra.flags |= RA_FLAG_NO_LOOKAHEAD;
+
if (!(file->f_mode & FMODE_WRITE))
lo_flags |= LO_FLAGS_READ_ONLY;
_
Patches currently in -mm which might be from wfg@xxxxxxxxxxxxxxxx are
readahead-loop-case.patch
readahead-nfsd-case.patch
readahead-turn-on-by-default.patch
readahead-debug-radix-tree-new-functions.patch
readahead-debug-traces-showing-accessed-file-names.patch
readahead-debug-traces-showing-read-patterns.patch
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