The patch titled
readahead: call scheme: fix thrashed unaligned read
has been added to the -mm tree. Its filename is
readahead-call-scheme-fix-thrashed-unaligned-read.patch
*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: readahead: call scheme: fix thrashed unaligned read
From: Fengguang Wu <wfg@xxxxxxxxxxxxxxxx>
When doing unaligned/subpages sequential reads, and thrashing happened, it is
possible that (offset == prev_page), besides the normal (offset == prev_page +
1).
We do not have such problem for the state based method.
Signed-off-by: Fengguang Wu <wfg@xxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
mm/readahead.c | 2 +-
1 files changed, 1 insertion(+), 1 deletion(-)
diff -puN mm/readahead.c~readahead-call-scheme-fix-thrashed-unaligned-read mm/readahead.c
--- a/mm/readahead.c~readahead-call-scheme-fix-thrashed-unaligned-read
+++ a/mm/readahead.c
@@ -1614,7 +1614,7 @@ page_cache_readahead_adaptive(struct add
/*
* Recover from possible thrashing.
*/
- if (!page && offset == ra->prev_page + 1 && ra_has_index(ra, offset))
+ if (!page && offset - ra->prev_page <= 1 && ra_has_index(ra, offset))
return thrashing_recovery_readahead(mapping, filp, ra,
offset, ra_max);
_
Patches currently in -mm which might be from wfg@xxxxxxxxxxxxxxxx are
readahead-kconfig-options.patch
readahead-kconfig-options-fix.patch
radixtree-introduce-scan-hole-data-functions.patch
mm-introduce-probe_page.patch
mm-introduce-pg_readahead.patch
readahead-add-look-ahead-support-to-__do_page_cache_readahead.patch
readahead-insert-cond_resched-calls.patch
readahead-minmax_ra_pages.patch
readahead-events-accounting.patch
readahead-events-accounting-make-readahead_debug_level-static.patch
readahead-rescue_pages.patch
readahead-sysctl-parameters.patch
readahead-sysctl-parameters-use-ctl_unnumbered.patch
readahead-sysctl-parameters-fix.patch
readahead-sysctl-parameters-set-readahead_hit_rate=1.patch
readahead-min-max-sizes.patch
readahead-min-max-sizes-remove-get_readahead_bounds.patch
readahead-min-max-sizes-increase-vm_min_readahead-to-32kb.patch
readahead-state-based-method-aging-accounting.patch
readahead-state-based-method-routines.patch
readahead-state-based-method-routines-explicitly-embed-class_new-class_old-inside-flags.patch
readahead-state-based-method.patch
readahead-state-based-method-prevent-tiny-size.patch
readahead-state-based-method-move-readahead_ratio-out-of-compute_thrashing_threshold.patch
readahead-context-based-method.patch
readahead-context-based-method-locking-fix.patch
readahead-context-based-method-locking-fix-2.patch
readahead-context-based-method-update-ra_min.patch
readahead-context-based-method-remove-readahead_ratio.patch
readahead-initial-method-guiding-sizes.patch
readahead-initial-method-thrashing-guard-size.patch
readahead-initial-method-user-recommended-size.patch
readahead-initial-method-user-recommended-size-rename-to-read_ahead_initial_kb.patch
readahead-initial-method.patch
readahead-backward-prefetching-method.patch
readahead-thrashing-recovery-method.patch
readahead-thrashing-recovery-method-fix.patch
readahead-call-scheme.patch
readahead-call-scheme-ifdef-fix.patch
readahead-call-scheme-build-fix.patch
readahead-call-scheme-remove-get_readahead_bounds.patch
readahead-call-scheme-fix-thrashed-unaligned-read.patch
readahead-laptop-mode.patch
readahead-laptop-mode-fix.patch
readahead-loop-case.patch
readahead-nfsd-case.patch
readahead-nfsd-case-fix.patch
readahead-nfsd-case-fix-uninitialized-ra_min-ra_max.patch
readahead-nfsd-case-remove-ra_min.patch
readahead-turn-on-by-default.patch
readahead-remove-size-limit-on-read_ahead_kb.patch
readahead-remove-size-limit-of-max_sectors_kb-on-read_ahead_kb.patch
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