The patch titled
readahead: thrashing recovery method: check unbalanced aging
has been added to the -mm tree. Its filename is
readahead-thrashing-recovery-method-check-unbalanced-aging.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: thrashing recovery method: check unbalanced aging
From: Fengguang Wu <wfg@xxxxxxxxxxxxxxxx>
Always check for unbalanced aging in thrashing_recovery_readahead(), and
account RA_EVENT_READAHEAD_MUTILATE/RA_EVENT_READAHEAD_THRASHING events.
Unbalanced zone/node aging can come from abnormal system loads, or
misconfigured NUMA policies.
Thrashings are rare events, hence the cost of probe_page() is not a concern.
Signed-off-by: Fengguang Wu <wfg@xxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/readahead.c | 11 ++++-------
1 file changed, 4 insertions(+), 7 deletions(-)
diff -puN mm/readahead.c~readahead-thrashing-recovery-method-check-unbalanced-aging mm/readahead.c
--- a/mm/readahead.c~readahead-thrashing-recovery-method-check-unbalanced-aging
+++ a/mm/readahead.c
@@ -1546,14 +1546,11 @@ thrashing_recovery_readahead(struct addr
pgoff_t offset, unsigned long ra_max)
{
unsigned long ra_size;
+ int unbalanced_aging = probe_page(mapping, offset - 1);
-#ifdef CONFIG_DEBUG_READAHEAD
- if (probe_page(mapping, offset - 1))
- ra_account(ra, RA_EVENT_READAHEAD_MUTILATE,
- ra->readahead_index - offset);
- ra_account(ra, RA_EVENT_READAHEAD_THRASHING,
- ra->readahead_index - offset);
-#endif
+ ra_account(ra, unbalanced_aging ? RA_EVENT_READAHEAD_MUTILATE :
+ RA_EVENT_READAHEAD_THRASHING,
+ ra->readahead_index - offset);
if (offset < ra->ra_index) {
/*
_
Patches currently in -mm which might be from wfg@xxxxxxxxxxxxxxxx are
readahead-kconfig-options.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-rescue_pages.patch
readahead-sysctl-parameters.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-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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