The patch titled
vmscan: fix pagecache reclaim referenced bit check
has been added to the -mm tree. Its filename is
vmscan-fix-pagecache-reclaim-referenced-bit-check.patch
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The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: vmscan: fix pagecache reclaim referenced bit check
From: Rik van Riel <riel@xxxxxxxxxx>
The -mm tree contains the patch
vmscan-give-referenced-active-and-unmapped-pages-a-second-trip-around-the-lru.patch
which gives referenced pagecache pages another trip around
the active list. This seems to help keep frequently accessed
pagecache pages in memory.
However, it means that pagecache pages that get moved to the
inactive list do not have their referenced bit set, and a
reference to the page will not get it moved back to the active
list. This patch sets the referenced bit on pagecache pages
that get deactivated, so the next access to the page will promote
it back to the active list.
---
1 file changed, 4 insertions(+)
Index: linux-2.6.26-rc2-mm1/mm/vmscan.c
===================================================================
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/vmscan.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff -puN mm/vmscan.c~fix-pagecache-reclaim-referenced-bit-check mm/vmscan.c
--- a/mm/vmscan.c~fix-pagecache-reclaim-referenced-bit-check
+++ a/mm/vmscan.c
@@ -1080,8 +1080,13 @@ static void shrink_active_list(unsigned
list_add(&page->lru, &l_inactive);
pgmoved++;
}
- } else
+ } else {
list_add(&page->lru, &l_inactive);
+ if (file && !page_mapped(page))
+ /* Bypass use-once, make the next access count.
+ * See mark_page_accessed. */
+ SetPageReferenced(page);
+ }
}
/*
_
Patches currently in -mm which might be from riel@xxxxxxxxxx are
ntp-let-update_persistent_clock-sleep.patch
access_process_vm-device-memory-infrastructure.patch
access_process_vm-device-memory-infrastructure-fix.patch
use-generic_access_phys-for-dev-mem-mappings.patch
use-generic_access_phys-for-dev-mem-mappings-fix.patch
use-generic_access_phys-for-pci-mmap-on-x86.patch
powerpc-ioremap_prot.patch
spufs-use-the-new-vm_ops-access.patch
spufs-use-the-new-vm_ops-access-fix.patch
page-flags-record-page-flag-overlays-explicitly.patch
page-flags-record-page-flag-overlays-explicitly-xen.patch
slub-record-page-flag-overlays-explicitly.patch
slob-record-page-flag-overlays-explicitly.patch
vmscan-give-referenced-active-and-unmapped-pages-a-second-trip-around-the-lru.patch
idr-change-the-idr-structure.patch
idr-rename-some-of-the-idr-apis-internal-routines.patch
idr-fix-a-printk-call.patch
idr-error-checking-factorization.patch
idr-make-idr_get_new-rcu-safe.patch
idr-make-idr_get_new-rcu-safe-fix.patch
idr-make-idr_find-rcu-safe.patch
idr-make-idr_remove-rcu-safe.patch
ipc-call-idr_find-without-locking-in-ipc_lock.patch
ipc-get-rid-of-ipc_lock_down.patch
vmscan-move-isolate_lru_page-to-vmscanc.patch
vmscan-use-an-indexed-array-for-lru-variables.patch
vmscan-use-an-array-for-the-lru-pagevecs.patch
vmscan-free-swap-space-on-swap-in-activation.patch
vmscan-define-page_file_cache-function.patch
vmscan-split-lru-lists-into-anon-file-sets.patch
vmscan-second-chance-replacement-for-anonymous-pages.patch
vmscan-add-some-sanity-checks-to-get_scan_ratio.patch
vmscan-fix-pagecache-reclaim-referenced-bit-check.patch
vmscan-add-newly-swapped-in-pages-to-the-inactive-list.patch
vmscan-more-aggressively-use-lumpy-reclaim.patch
vmscan-pageflag-helpers-for-configed-out-flags.patch
vmscan-noreclaim-lru-infrastructure.patch
vmscan-noreclaim-lru-page-statistics.patch
vmscan-ramfs-and-ram-disk-pages-are-non-reclaimable.patch
vmscan-shm_locked-pages-are-non-reclaimable.patch
vmscan-mlocked-pages-are-non-reclaimable.patch
vmscan-downgrade-mmap-sem-while-populating-mlocked-regions.patch
vmscan-handle-mlocked-pages-during-map-remap-unmap.patch
vmscan-mlocked-pages-statistics.patch
vmscan-cull-non-reclaimable-pages-in-fault-path.patch
vmscan-noreclaim-and-mlocked-pages-vm-events.patch
mm-only-vmscan-noreclaim-lru-scan-sysctl.patch
vmscan-mlocked-pages-count-attempts-to-free-mlocked-page.patch
vmscan-noreclaim-lru-and-mlocked-pages-documentation.patch
make-mm-rmapc-anon_vma_cachep-static.patch
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