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revert "Revert "mm: remove __GFP_NO_KSWAPD"" 

It apepars that this patch was innocent, and we hope that "mm: avoid
waking kswapd for THP allocations when compaction is deferred or
contended" will fix the final kswapd-spinning cause.

Cc: Zdenek Kabelac <zkabelac@redhat.com>
Cc: Seth Jennings <sjenning@linux.vnet.ibm.com>
Cc: Valdis Kletnieks <Valdis.Kletnieks@vt.edu>
Cc: Jiri Slaby <jirislaby@gmail.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Robert Jennings <rcj@linux.vnet.ibm.com>
Cc: Mel Gorman <mgorman@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Andrew Morton 2012-11-29 13:54:27 -08:00 committed by Linus Torvalds
parent 60cefed485
commit a50915394f
4 changed files with 10 additions and 17 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/mtd/mtdcore.c
View File

@ -1077,8 +1077,7 @@ EXPORT_SYMBOL_GPL(mtd_writev);
* until the request succeeds or until the allocation size falls below
* the system page size. This attempts to make sure it does not adversely
* impact system performance, so when allocating more than one page, we
* ask the memory allocator to avoid re-trying, swapping, writing back
* or performing I/O.
* ask the memory allocator to avoid re-trying.
*
* Note, this function also makes sure that the allocated buffer is aligned to
* the MTD device's min. I/O unit, i.e. the "mtd->writesize" value.
@ -1092,8 +1091,7 @@ EXPORT_SYMBOL_GPL(mtd_writev);
*/
void *mtd_kmalloc_up_to(const struct mtd_info *mtd, size_t *size)
{
gfp_t flags = __GFP_NOWARN | __GFP_WAIT |
__GFP_NORETRY | __GFP_NO_KSWAPD;
gfp_t flags = __GFP_NOWARN | __GFP_WAIT | __GFP_NORETRY;
size_t min_alloc = max_t(size_t, mtd->writesize, PAGE_SIZE);
void *kbuf;

13
include/linux/gfp.h
View File

@ -30,10 +30,9 @@ struct vm_area_struct;
#define ___GFP_HARDWALL 0x20000u
#define ___GFP_THISNODE 0x40000u
#define ___GFP_RECLAIMABLE 0x80000u
#define ___GFP_NOTRACK 0x200000u
#define ___GFP_NO_KSWAPD 0x400000u
#define ___GFP_OTHER_NODE 0x800000u
#define ___GFP_WRITE 0x1000000u
#define ___GFP_NOTRACK 0x100000u
#define ___GFP_OTHER_NODE 0x200000u
#define ___GFP_WRITE 0x400000u
/*
* GFP bitmasks..
@ -86,7 +85,6 @@ struct vm_area_struct;
#define __GFP_RECLAIMABLE ((__force gfp_t)___GFP_RECLAIMABLE) /* Page is reclaimable */
#define __GFP_NOTRACK ((__force gfp_t)___GFP_NOTRACK) /* Don't track with kmemcheck */
#define __GFP_NO_KSWAPD ((__force gfp_t)___GFP_NO_KSWAPD)
#define __GFP_OTHER_NODE ((__force gfp_t)___GFP_OTHER_NODE) /* On behalf of other node */
#define __GFP_WRITE ((__force gfp_t)___GFP_WRITE) /* Allocator intends to dirty page */
@ -96,7 +94,7 @@ struct vm_area_struct;
*/
#define __GFP_NOTRACK_FALSE_POSITIVE (__GFP_NOTRACK)
#define __GFP_BITS_SHIFT 25 /* Room for N __GFP_FOO bits */
#define __GFP_BITS_SHIFT 23 /* Room for N __GFP_FOO bits */
#define __GFP_BITS_MASK ((__force gfp_t)((1 << __GFP_BITS_SHIFT) - 1))
/* This equals 0, but use constants in case they ever change */
@ -116,8 +114,7 @@ struct vm_area_struct;
__GFP_MOVABLE)
#define GFP_IOFS (__GFP_IO | __GFP_FS)
#define GFP_TRANSHUGE (GFP_HIGHUSER_MOVABLE | __GFP_COMP | \
__GFP_NOMEMALLOC | __GFP_NORETRY | __GFP_NOWARN | \
__GFP_NO_KSWAPD)
__GFP_NOMEMALLOC | __GFP_NORETRY | __GFP_NOWARN)
#ifdef CONFIG_NUMA
#define GFP_THISNODE (__GFP_THISNODE | __GFP_NOWARN | __GFP_NORETRY)

1
include/trace/events/gfpflags.h
View File

@ -36,7 +36,6 @@
{(unsigned long)__GFP_RECLAIMABLE, "GFP_RECLAIMABLE"}, \
{(unsigned long)__GFP_MOVABLE, "GFP_MOVABLE"}, \
{(unsigned long)__GFP_NOTRACK, "GFP_NOTRACK"}, \
{(unsigned long)__GFP_NO_KSWAPD, "GFP_NO_KSWAPD"}, \
{(unsigned long)__GFP_OTHER_NODE, "GFP_OTHER_NODE"} \
) : "GFP_NOWAIT"

7
mm/page_alloc.c
View File

@ -2416,9 +2416,8 @@ __alloc_pages_slowpath(gfp_t gfp_mask, unsigned int order,
goto nopage;
restart:
if (!(gfp_mask & __GFP_NO_KSWAPD))
wake_all_kswapd(order, zonelist, high_zoneidx,
zone_idx(preferred_zone));
wake_all_kswapd(order, zonelist, high_zoneidx,
zone_idx(preferred_zone));
/*
* OK, we're below the kswapd watermark and have kicked background
@ -2495,7 +2494,7 @@ rebalance:
* system then fail the allocation instead of entering direct reclaim.
*/
if ((deferred_compaction || contended_compaction) &&
(gfp_mask & __GFP_NO_KSWAPD))
(gfp_mask & (__GFP_MOVABLE|__GFP_REPEAT)) == __GFP_MOVABLE)
goto nopage;
/* Try direct reclaim and then allocating */