The patch titled
readahead: state based method - stand-alone size limit code
has been added to the -mm tree. Its filename is
readahead-state-based-method-readahead-state-based-method-stand-alone-size-limit-code.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: state based method - stand-alone size limit code
From: Wu Fengguang <wfg@xxxxxxxxxxxxxxxx>
Separate out the readahead/lookahead sizes limiting code, and put them to
stand-alone limit_rala() function.
Signed-off-by: Wu Fengguang <wfg@xxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
mm/readahead.c | 29 +++++++++++++++++------------
1 file changed, 17 insertions(+), 12 deletions(-)
diff -puN mm/readahead.c~readahead-state-based-method-readahead-state-based-method-stand-alone-size-limit-code mm/readahead.c
--- devel/mm/readahead.c~readahead-state-based-method-readahead-state-based-method-stand-alone-size-limit-code 2006-05-30 14:19:32.000000000 -0700
+++ devel-akpm/mm/readahead.c 2006-05-30 14:19:32.000000000 -0700
@@ -1009,10 +1009,8 @@ static int ra_dispatch(struct file_ra_st
* - @la_size stores the look-ahead size of previous request.
*/
static int adjust_rala(unsigned long ra_max,
- unsigned long *ra_size, unsigned long *la_size)
+ unsigned long *ra_size, unsigned long *la_size)
{
- unsigned long stream_shift = *la_size;
-
/*
* Substract the old look-ahead to get real safe size for the next
* read-ahead request.
@@ -1029,8 +1027,16 @@ static int adjust_rala(unsigned long ra_
*/
*la_size = *ra_size / LOOKAHEAD_RATIO;
+ return 1;
+}
+
+static void limit_rala(unsigned long ra_max, unsigned long la_old,
+ unsigned long *ra_size, unsigned long *la_size)
+{
+ unsigned long stream_shift;
+
/*
- * Apply upper limits.
+ * Apply basic upper limits.
*/
if (*ra_size > ra_max)
*ra_size = ra_max;
@@ -1041,11 +1047,9 @@ static int adjust_rala(unsigned long ra_
* Make sure stream_shift is not too small.
* (So that the next global_shift will not be too small.)
*/
- stream_shift += (*ra_size - *la_size);
+ stream_shift = la_old + (*ra_size - *la_size);
if (stream_shift < *ra_size / 4)
*la_size -= (*ra_size / 4 - stream_shift);
-
- return 1;
}
/*
@@ -1117,13 +1121,13 @@ state_based_readahead(struct address_spa
struct page *page, pgoff_t index,
unsigned long req_size, unsigned long ra_max)
{
- unsigned long ra_old;
- unsigned long ra_size;
- unsigned long la_size;
+ unsigned long ra_old, ra_size;
+ unsigned long la_old, la_size;
unsigned long remain_space;
unsigned long growth_limit;
- la_size = ra->readahead_index - index;
+ la_old = la_size = ra->readahead_index - index;
+ ra_old = ra_readahead_size(ra);
ra_size = compute_thrashing_threshold(ra, &remain_space);
if (page && remain_space <= la_size && la_size > 1) {
@@ -1131,7 +1135,6 @@ state_based_readahead(struct address_spa
return 0;
}
- ra_old = ra_readahead_size(ra);
growth_limit = req_size;
growth_limit += ra_max / 16;
growth_limit += (2 + readahead_ratio / 64) * ra_old;
@@ -1141,6 +1144,8 @@ state_based_readahead(struct address_spa
if (!adjust_rala(growth_limit, &ra_size, &la_size))
return 0;
+ limit_rala(growth_limit, la_old, &ra_size, &la_size);
+
ra_set_class(ra, RA_CLASS_STATE);
ra_set_index(ra, index, ra->readahead_index);
ra_set_size(ra, ra_size, la_size);
_
Patches currently in -mm which might be from wfg@xxxxxxxxxxxxxxxx are
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.patch
readahead-state-based-method-readahead-state-based-method-stand-alone-size-limit-code.patch
readahead-context-based-method.patch
readahead-initial-method-guiding-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-seeking-reads-method.patch
readahead-thrashing-recovery-method.patch
readahead-call-scheme.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-context-based-method-apply-stream_shift-size-limits-to-contexta-method.patch
readahead-context-based-method-fix-remain-counting.patch
readahead-backward-prefetching-method-add-use-case-comment.patch
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