The patch titled
readahead: aggressive initial sizes
has been added to the -mm tree. Its filename is
readahead-initial-method-guiding-sizes-aggressive-initial-sizes.patch
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: readahead: aggressive initial sizes
From: Wu Fengguang <wfg@xxxxxxxxxxxxxxxx>
Set ra_expect_bytes and ra_thrash_bytes of default_backing_dev_info to large
numbers.
Large initial values are better, because
- most systems don't have the danger of thrashing
- most small files are read in whole
- they both increase slowly and drop rapidly
Signed-off-by: Wu Fengguang <wfg@xxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
mm/readahead.c | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)
diff -puN mm/readahead.c~readahead-initial-method-guiding-sizes-aggressive-initial-sizes mm/readahead.c
--- devel/mm/readahead.c~readahead-initial-method-guiding-sizes-aggressive-initial-sizes 2006-06-09 01:22:46.000000000 -0700
+++ devel-akpm/mm/readahead.c 2006-06-09 01:22:46.000000000 -0700
@@ -30,6 +30,9 @@
* Adaptive read-ahead parameters.
*/
+/* Default max read-ahead size for the initial method. */
+#define INITIAL_RA_PAGES DIV_ROUND_UP(128*1024, PAGE_CACHE_SIZE)
+
/* In laptop mode, poll delayed look-ahead on every ## pages read. */
#define LAPTOP_POLL_INTERVAL 16
@@ -123,9 +126,9 @@ EXPORT_SYMBOL(default_unplug_io_fn);
struct backing_dev_info default_backing_dev_info = {
.ra_pages = MAX_RA_PAGES,
- .ra_pages0 = (128*1024) / PAGE_CACHE_SIZE,
- .ra_expect_bytes = VM_MIN_READAHEAD*1024,
- .ra_thrash_bytes = VM_MIN_READAHEAD*1024,
+ .ra_pages0 = INITIAL_RA_PAGES,
+ .ra_expect_bytes = INITIAL_RA_PAGES * PAGE_CACHE_SIZE,
+ .ra_thrash_bytes = MAX_RA_PAGES * PAGE_CACHE_SIZE,
.state = 0,
.capabilities = BDI_CAP_MAP_COPY,
.unplug_io_fn = default_unplug_io_fn,
_
Patches currently in -mm which might be from wfg@xxxxxxxxxxxxxxxx are
radixtree-normalize-radix_tree_tag_get-return-value.patch
readahead-kconfig-options.patch
radixtree-introduce-radix_tree_scan_hole.patch
mm-introduce-probe_page.patch
mm-introduce-pg_readahead.patch
readahead-add-look-ahead-support-to-__do_page_cache_readahead.patch
readahead-delay-page-release-in-do_generic_mapping_read.patch
readahead-insert-cond_resched-calls.patch
readahead-minmax_ra_pages.patch
readahead-events-accounting.patch
readahead-rescue_pages.patch
readahead-sysctl-parameters.patch
readahead-sysctl-parameters-fix.patch
readahead-min-max-sizes.patch
readahead-state-based-method-aging-accounting.patch
readahead-state-based-method-routines.patch
readahead-state-based-method-routines-no-ra_flag_eof-on-single-page-file.patch
readahead-state-based-method.patch
readahead-state-based-method-readahead-state-based-method-stand-alone-size-limit-code.patch
readahead-context-based-method.patch
readahead-context-based-method-apply-stream_shift-size-limits-to-contexta-method.patch
readahead-context-based-method-fix-remain-counting.patch
readahead-initial-method-guiding-sizes.patch
readahead-initial-method-guiding-sizes-aggressive-initial-sizes.patch
readahead-initial-method-thrashing-guard-size.patch
readahead-initial-method-expected-read-size.patch
readahead-initial-method-user-recommended-size.patch
readahead-initial-method.patch
readahead-backward-prefetching-method.patch
readahead-backward-prefetching-method-add-use-case-comment.patch
readahead-seeking-reads-method.patch
readahead-thrashing-recovery-method.patch
readahead-call-scheme.patch
readahead-call-scheme-fix-fastcall.patch
readahead-call-scheme-no-fastcall-for-readahead_cache_hit.patch
readahead-laptop-mode.patch
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
readahead-backoff-on-i-o-error.patch
readahead-remove-size-limit-on-read_ahead_kb.patch
-
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