The patch titled
Subject: huge tmpfs: no kswapd by default on sync allocations
has been added to the -mm tree. Its filename is
huge-tmpfs-no-kswapd-by-default-on-sync-allocations.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/huge-tmpfs-no-kswapd-by-default-on-sync-allocations.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/huge-tmpfs-no-kswapd-by-default-on-sync-allocations.patch
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------------------------------------------------------
From: Andres Lagar-Cavilla <andreslc@xxxxxxxxxx>
Subject: huge tmpfs: no kswapd by default on sync allocations
This triggers early compaction abort while in process context, to
ameliorate mmap semaphore stalls.
Signed-off-by: Andres Lagar-Cavilla <andreslc@xxxxxxxxxx>
Signed-off-by: Hugh Dickins <hughd@xxxxxxxxxx>
Suggested-by: David Rientjes <rientjes@xxxxxxxxxx>
Cc: "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>
Cc: Andrea Arcangeli <aarcange@xxxxxxxxxx>
Cc: Yang Shi <yang.shi@xxxxxxxxxx>
Cc: Ning Qu <quning@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
Documentation/filesystems/tmpfs.txt | 5 +++--
mm/shmem.c | 3 ++-
2 files changed, 5 insertions(+), 3 deletions(-)
diff -puN Documentation/filesystems/tmpfs.txt~huge-tmpfs-no-kswapd-by-default-on-sync-allocations Documentation/filesystems/tmpfs.txt
--- a/Documentation/filesystems/tmpfs.txt~huge-tmpfs-no-kswapd-by-default-on-sync-allocations
+++ a/Documentation/filesystems/tmpfs.txt
@@ -194,8 +194,9 @@ to force huge off for all (intended for
/proc/sys/vm/shmem_huge_gfpmask (intended for experimentation only):
-Default 38146762, that is 0x24612ca:
-GFP_HIGHUSER_MOVABLE|__GFP_NOWARN|__GFP_THISNODE|__GFP_NORETRY.
+Default 4592330, that is 0x4612ca:
+GFP_HIGHUSER_MOVABLE|__GFP_NOWARN|__GFP_THISNODE|__GFP_NORETRY
+minus __GFP_KSWAPD_RECLAIM.
Write a gfpmask built from __GFP flags in include/linux/gfp.h, to experiment
with better alternatives for the synchronous huge tmpfs allocation used
when faulting or writing.
diff -puN mm/shmem.c~huge-tmpfs-no-kswapd-by-default-on-sync-allocations mm/shmem.c
--- a/mm/shmem.c~huge-tmpfs-no-kswapd-by-default-on-sync-allocations
+++ a/mm/shmem.c
@@ -324,7 +324,8 @@ int shmem_huge __read_mostly;
int shmem_huge_recoveries __read_mostly = 8; /* concurrent recovery limit */
int shmem_huge_gfpmask __read_mostly =
- (int)(GFP_HIGHUSER_MOVABLE|__GFP_NOWARN|__GFP_THISNODE|__GFP_NORETRY);
+ (int)(GFP_HIGHUSER_MOVABLE|__GFP_NOWARN|__GFP_THISNODE|__GFP_NORETRY) &
+ ~__GFP_KSWAPD_RECLAIM;
int shmem_recovery_gfpmask __read_mostly =
(int)(GFP_HIGHUSER_MOVABLE|__GFP_NOWARN|__GFP_THISNODE);
_
Patches currently in -mm which might be from andreslc@xxxxxxxxxx are
tmpfs-mem_cgroup-charge-fault-to-vm_mm-not-current-mm.patch
kvm-plumb-return-of-hva-when-resolving-page-fault.patch
kvm-teach-kvm-to-map-page-teams-as-huge-pages.patch
huge-tmpfs-mem_cgroup-shmem_pmdmapped-accounting.patch
huge-tmpfs-mem_cgroup-shmem_hugepages-accounting.patch
huge-tmpfs-show-page-team-flag-in-pageflags.patch
huge-tmpfs-no-kswapd-by-default-on-sync-allocations.patch
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