The patch titled
Subject: swap-add-a-simple-detector-for-inappropriate-swapin-readahead-fix
has been removed from the -mm tree. Its filename was
swap-add-a-simple-detector-for-inappropriate-swapin-readahead-fix.patch
This patch was dropped because it was folded into swap-add-a-simple-detector-for-inappropriate-swapin-readahead.patch
------------------------------------------------------
From: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Subject: swap-add-a-simple-detector-for-inappropriate-swapin-readahead-fix
tweak code comment
Cc: Hugh Dickins <hughd@xxxxxxxxxx>
Cc: Konstantin Khlebnikov <khlebnikov@xxxxxxxxxx>
Cc: Minchan Kim <minchan@xxxxxxxxxx>
Cc: Rik van Riel <riel@xxxxxxxxxx>
Cc: Shaohua Li <shli@xxxxxxxxxxxx>
Cc: Shaohua Li <shli@xxxxxxxxxx>
Cc: Wu Fengguang <fengguang.wu@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/internal.h | 15 ++++++---------
1 file changed, 6 insertions(+), 9 deletions(-)
diff -puN mm/internal.h~swap-add-a-simple-detector-for-inappropriate-swapin-readahead-fix mm/internal.h
--- a/mm/internal.h~swap-add-a-simple-detector-for-inappropriate-swapin-readahead-fix
+++ a/mm/internal.h
@@ -377,15 +377,12 @@ unsigned long reclaim_clean_pages_from_l
#define ALLOC_CMA 0x80 /* allow allocations from CMA areas */
/*
- * Unnecessary readahead harms performance. 1. for SSD, big size read is more
- * expensive than small size read, so extra unnecessary read only has overhead.
- * For harddisk, this overhead doesn't exist. 2. unnecessary readahead will
- * allocate extra memroy, which further tights memory pressure, so more
- * swapout/swapin.
- * These adds a simple swap random access detection. In swap page fault, if
- * page is found in swap cache, decrease an account of vma, otherwise we need
- * do sync swapin and the account is increased. Optionally swapin will do
- * readahead if the counter is below a threshold.
+ * Unnecessary readahead harms performance, especially for SSD devices, where
+ * large reads are significantly more expensive than small ones.
+ * These implements simple swap random access detection. In swap page fault: if
+ * the page is found in swapcache, decrease a counter in the vma, otherwise we
+ * need to perform sync swapin and the counter is increased. Optionally swapin
+ * will perform readahead if the counter is below a threshold.
*/
#ifdef CONFIG_SWAP
#define SWAPRA_MISS_THRESHOLD (100)
_
Patches currently in -mm which might be from akpm@xxxxxxxxxxxxxxxxxxxx are
origin.patch
arch-x86-platform-iris-irisc-register-a-platform-device-and-a-platform-driver.patch
irq-tsk-comm-is-an-array.patch
memory-hotplug-document-and-enable-config_movable_node.patch
memcg-kmem-accounting-basic-infrastructure.patch
slub-slub-specific-propagation-changes.patch
mm-mprotectc-coding-style-cleanups.patch
mm-hugetlb-create-hugetlb-cgroup-file-in-hugetlb_init.patch
mm-avoid-possible-deadlock-caused-by-too_many_isolated.patch
linux-next.patch
linux-next-rejects.patch
linux-next-git-rejects.patch
make-my-i386-build-work.patch
i-need-old-gcc.patch
arch-alpha-kernel-systblss-remove-debug-check.patch
sgi-xp-handle-non-fatal-traps-fix.patch
arch-x86-tools-insn_sanityc-identify-source-of-messages.patch
fb-rework-locking-to-fix-lock-ordering-on-takeover-fix.patch
fb-rework-locking-to-fix-lock-ordering-on-takeover-fix-2.patch
block-remove-deadlock-in-disk_clear_events.patch
block-prevent-race-cleanup.patch
mm.patch
drop_caches-add-some-documentation-and-info-messsge-checkpatch-fixes.patch
swap-add-a-simple-detector-for-inappropriate-swapin-readahead.patch
memcg-debugging-facility-to-access-dangling-memcgs-fix.patch
scripts-pnmtologo-fix-for-plain-pbm-checkpatch-fixes.patch
drivers-firmware-dmi_scanc-check-dmi-version-when-get-system-uuid-fix.patch
drivers-firmware-dmi_scanc-fetch-dmi-version-from-smbios-if-it-exists-checkpatch-fixes.patch
binfmt_elfc-use-get_random_int-to-fix-entropy-depleting.patch
hfsplus-add-osx-prefix-for-handling-namespace-of-mac-os-x-extended-attributes.patch
hfsplus-rework-processing-of-hfs_btree_write-returned-error.patch
ipc-add-sysctl-to-specify-desired-next-object-id.patch
ipc-message-queue-receive-cleanup.patch
ipc-convert-prepare_copy-from-macro-to-function.patch
dma-debug-new-interfaces-to-debug-dma-mapping-errors-fix-fix.patch
fs-notify-add-procfs-fdinfo-helper-v7-fix.patch
journal_add_journal_head-debug.patch
kernel-forkc-export-kernel_thread-to-modules.patch
mutex-subsystem-synchro-test-module-fix.patch
slab-leaks3-default-y.patch
put_bh-debug.patch
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