The patch titled
readahead: min/max sizes
has been removed from the -mm tree. Its filename was
readahead-min-max-sizes.patch
This patch was dropped because an updated version will be merged
------------------------------------------------------
Subject: readahead: min/max sizes
From: Wu Fengguang <wfg@xxxxxxxxxxxxxxxx>
- Enlarge VM_MAX_READAHEAD to 1024 if new read-ahead code is compiled in.
This value is no longer tightly coupled with the thrashing problem,
therefore constrained by it. The adaptive read-ahead logic merely takes
it as an upper bound, and will not stick to it under memory pressure.
- Slightly enlarge minimal/initial read-ahead size on big memory systems.
Memory bounty systems are less likely to suffer from thrashing on small
read-ahead sizes. A bigger initial value helps the ra_size scaling up
progress.
Signed-off-by: Wu Fengguang <wfg@xxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/mm.h | 5 +++++
1 file changed, 5 insertions(+)
diff -puN include/linux/mm.h~readahead-min-max-sizes include/linux/mm.h
--- a/include/linux/mm.h~readahead-min-max-sizes
+++ a/include/linux/mm.h
@@ -1146,8 +1146,13 @@ extern struct page *filemap_fault(struct
int write_one_page(struct page *page, int wait);
/* readahead.c */
+#ifdef CONFIG_ADAPTIVE_READAHEAD
+#define VM_MAX_READAHEAD 1024 /* kbytes */
+#define VM_MIN_READAHEAD 32 /* kbytes (includes current page) */
+#else
#define VM_MAX_READAHEAD 128 /* kbytes */
#define VM_MIN_READAHEAD 16 /* kbytes (includes current page) */
+#endif
#define VM_MAX_CACHE_HIT 256 /* max pages in a row in cache before
* turning readahead off */
_
Patches currently in -mm which might be from wfg@xxxxxxxxxxxxxxxx are
origin.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-check-node-id.patch
readahead-state-based-method-decouple-readahead_ratio-from-growth_limit.patch
readahead-state-based-method-cancel-lookahead-gracefully.patch
readahead-context-based-method.patch
readahead-initial-method-guiding-sizes.patch
readahead-initial-method-thrashing-guard-size.patch
readahead-initial-method-user-recommended-size.patch
readahead-initial-method.patch
readahead-backward-prefetching-method.patch
readahead-thrashing-recovery-method.patch
readahead-thrashing-recovery-method-check-unbalanced-aging.patch
readahead-thrashing-recovery-method-refill-holes.patch
readahead-call-scheme.patch
readahead-call-scheme-cleanup.patch
readahead-call-scheme-catch-thrashing-on-lookahead-time.patch
readahead-call-scheme-doc-fixes-for-readahead.patch
readahead-laptop-mode.patch
readahead-loop-case.patch
readahead-nfsd-case.patch
readahead-remove-parameter-ra_max-from-thrashing_recovery_readahead.patch
readahead-remove-parameter-ra_max-from-adjust_rala.patch
readahead-state-based-method-protect-against-tiny-size.patch
readahead-rename-state_based_readahead-to-clock_based_readahead.patch
readahead-account-i-o-block-times-for-stock-readahead.patch
readahead-rescue_pages-updates.patch
readahead-remove-noaction-shrink-events.patch
readahead-remove-size-limit-on-read_ahead_kb.patch
readahead-remove-size-limit-of-max_sectors_kb-on-read_ahead_kb.patch
readahead-partial-sendfile-fix.patch
readahead-turn-on-by-default.patch
-
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