linux-stable.git/mm/vmstat.c, branch v3.7.4

mm: remove unevictable_pgs_mlockfreed

2012-10-09T07:22:59+00:00

Simply remove UNEVICTABLE_MLOCKFREED and unevictable_pgs_mlockfreed line
from /proc/vmstat: Johannes and Mel point out that it was very unlikely to
have been used by any tool, and of course we can restore it easily enough
if that turns out to be wrong.

Signed-off-by: Hugh Dickins 
Cc: Mel Gorman 
Cc: Rik van Riel 
Cc: Johannes Weiner 
Cc: Michel Lespinasse 
Cc: Ying Han 
Acked-by: Johannes Weiner 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

memory-hotplug: fix zone stat mismatch

2012-10-09T07:22:59+00:00

During memory-hotplug, I found NR_ISOLATED_[ANON|FILE] are increasing,
causing the kernel to hang.  When the system doesn't have enough free
pages, it enters reclaim but never reclaim any pages due to
too_many_isolated()==true and loops forever.

The cause is that when we do memory-hotadd after memory-remove,
__zone_pcp_update() clears a zone's ZONE_STAT_ITEMS in setup_pageset()
although the vm_stat_diff of all CPUs still have values.

In addtion, when we offline all pages of the zone, we reset them in
zone_pcp_reset without draining so we loss some zone stat item.

Reviewed-by: Wen Congyang 
Signed-off-by: Minchan Kim 
Cc: Kamezawa Hiroyuki 
Cc: Yasuaki Ishimatsu 
Cc: KOSAKI Motohiro 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

mm: remove free_page_mlock

2012-10-09T07:22:56+00:00

We should not be seeing non-0 unevictable_pgs_mlockfreed any longer.  So
remove free_page_mlock() from the page freeing paths: __PG_MLOCKED is
already in PAGE_FLAGS_CHECK_AT_FREE, so free_pages_check() will now be
checking it, reporting "BUG: Bad page state" if it's ever found set.
Comment UNEVICTABLE_MLOCKFREED and unevictable_pgs_mlockfreed always 0.

Signed-off-by: Hugh Dickins 
Acked-by: Mel Gorman 
Cc: Rik van Riel 
Cc: Johannes Weiner 
Cc: Michel Lespinasse 
Cc: Ying Han 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

cma: count free CMA pages

2012-10-09T07:22:44+00:00

Add NR_FREE_CMA_PAGES counter to be later used for checking watermark in
__zone_watermark_ok().  For simplicity and to avoid #ifdef hell make this
counter always available (not only when CONFIG_CMA=y).

[akpm@linux-foundation.org: use conventional migratetype naming]
Signed-off-by: Bartlomiej Zolnierkiewicz 
Signed-off-by: Kyungmin Park 
Cc: Marek Szyprowski 
Cc: Michal Nazarewicz 
Cc: Minchan Kim 
Cc: Mel Gorman 
Cc: Hugh Dickins 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

workqueue: make deferrable delayed_work initializer names consistent

2012-08-21T20:18:23+00:00

Initalizers for deferrable delayed_work are confused.

* __DEFERRED_WORK_INITIALIZER()
* DECLARE_DEFERRED_WORK()
* INIT_DELAYED_WORK_DEFERRABLE()

Rename them to

* __DEFERRABLE_WORK_INITIALIZER()
* DECLARE_DEFERRABLE_WORK()
* INIT_DEFERRABLE_WORK()

This patch doesn't cause any functional changes.

Signed-off-by: Tejun Heo

mm: account for the number of times direct reclaimers get throttled

2012-08-01T01:42:46+00:00

Under significant pressure when writing back to network-backed storage,
direct reclaimers may get throttled.  This is expected to be a short-lived
event and the processes get woken up again but processes do get stalled.
This patch counts how many times such stalling occurs.  It's up to the
administrator whether to reduce these stalls by increasing
min_free_kbytes.

Signed-off-by: Mel Gorman 
Cc: David Miller 
Cc: Neil Brown 
Cc: Peter Zijlstra 
Cc: Mike Christie 
Cc: Eric B Munson 
Cc: Eric Dumazet 
Cc: Sebastian Andrzej Siewior 
Cc: Mel Gorman 
Cc: Christoph Lameter 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

mm/vmstat.c: remove debug fs entries on failure of file creation and made extfrag_debug_root dentry local

2012-05-29T23:22:19+00:00

Remove debug fs files and directory on failure.  Since no one is using
"extfrag_debug_root" dentry outside of extfrag_debug_init(), make it
local to the function.

Signed-off-by: Sasikantha babu 
Acked-by: David Rientjes 
Acked-by: Mel Gorman 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

mm: mmzone: MIGRATE_CMA migration type added

2012-05-21T13:09:32+00:00

The MIGRATE_CMA migration type has two main characteristics:
(i) only movable pages can be allocated from MIGRATE_CMA
pageblocks and (ii) page allocator will never change migration
type of MIGRATE_CMA pageblocks.

This guarantees (to some degree) that page in a MIGRATE_CMA page
block can always be migrated somewhere else (unless there's no
memory left in the system).

It is designed to be used for allocating big chunks (eg. 10MiB)
of physically contiguous memory.  Once driver requests
contiguous memory, pages from MIGRATE_CMA pageblocks may be
migrated away to create a contiguous block.

To minimise number of migrations, MIGRATE_CMA migration type
is the last type tried when page allocator falls back to other
migration types when requested.

Signed-off-by: Michal Nazarewicz 
Signed-off-by: Marek Szyprowski 
Signed-off-by: Kyungmin Park 
Acked-by: Mel Gorman 
Reviewed-by: KAMEZAWA Hiroyuki 
Tested-by: Rob Clark 
Tested-by: Ohad Ben-Cohen 
Tested-by: Benjamin Gaignard 
Tested-by: Robert Nelson 
Tested-by: Barry Song

mm: fix up the vmscan stat in vmstat

2012-04-26T04:26:33+00:00

The "pgsteal" stat is confusing because it counts both direct reclaim as
well as background reclaim.  However, we have "kswapd_steal" which also
counts background reclaim value.

This patch fixes it and also makes it match the existng "pgscan_" stats.

Test:
pgsteal_kswapd_dma32 447623
pgsteal_kswapd_normal 42272677
pgsteal_kswapd_movable 0
pgsteal_direct_dma32 2801
pgsteal_direct_normal 44353270
pgsteal_direct_movable 0

Signed-off-by: Ying Han 
Reviewed-by: Rik van Riel 
Acked-by: Christoph Lameter 
Cc: Johannes Weiner 
Cc: Michal Hocko 
Cc: Mel Gorman 
Acked-by: KAMEZAWA Hiroyuki 
Cc: Hillf Danton 
Cc: Hugh Dickins 
Cc: Dan Magenheimer 
Reviewed-by: Minchan Kim 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

mm,x86,um: move CMPXCHG_LOCAL config option

2012-01-13T04:13:03+00:00

Move CMPXCHG_LOCAL and rename it to HAVE_CMPXCHG_LOCAL so architectures
can simply select the option if it is supported.

Signed-off-by: Heiko Carstens 
Acked-by: Christoph Lameter 
Cc: Pekka Enberg 
Cc: Ingo Molnar 
Cc: Thomas Gleixner 
Cc: "H. Peter Anvin" 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds