The patch titled
Subject: tmpfs: distribute interleave better across nodes
has been added to the -mm tree. Its filename is
tmpfs-distribute-interleave-better-across-nodes.patch
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From: Nathan Zimmer <nzimmer@xxxxxxx>
Subject: tmpfs: distribute interleave better across nodes
When tmpfs has the interleave memory policy, it always starts allocating
for each file from node 0 at offset 0. When there are many small files,
the lower nodes fill up disproportionately.
This patch spreads out node usage by starting files at nodes other than 0,
by using the inode number to bias the starting node for interleave.
Signed-off-by: Nathan Zimmer <nzimmer@xxxxxxx>
Signed-off-by: Hugh Dickins <hughd@xxxxxxxxxx>
Cc: Christoph Lameter <cl@xxxxxxxxx>
Cc: Nick Piggin <npiggin@xxxxxxxxx>
Cc: Lee Schermerhorn <lee.schermerhorn@xxxxxx>
Cc: KOSAKI Motohiro <kosaki.motohiro@xxxxxxxxxxxxxx>
Cc: Rik van Riel <riel@xxxxxxxxxx>
Cc: Andi Kleen <andi@xxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/shmem.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff -puN mm/shmem.c~tmpfs-interleave-the-starting-node-of-dev-shmem mm/shmem.c
--- a/mm/shmem.c~tmpfs-interleave-the-starting-node-of-dev-shmem
+++ a/mm/shmem.c
@@ -929,7 +929,8 @@ static struct page *shmem_swapin(swp_ent
/* Create a pseudo vma that just contains the policy */
pvma.vm_start = 0;
- pvma.vm_pgoff = index;
+ /* Bias interleave by inode number to distribute better across nodes */
+ pvma.vm_pgoff = index + info->vfs_inode.i_ino;
pvma.vm_ops = NULL;
pvma.vm_policy = spol;
return swapin_readahead(swap, gfp, &pvma, 0);
@@ -942,7 +943,8 @@ static struct page *shmem_alloc_page(gfp
/* Create a pseudo vma that just contains the policy */
pvma.vm_start = 0;
- pvma.vm_pgoff = index;
+ /* Bias interleave by inode number to distribute better across nodes */
+ pvma.vm_pgoff = index + info->vfs_inode.i_ino;
pvma.vm_ops = NULL;
pvma.vm_policy = mpol_shared_policy_lookup(&info->policy, index);
_
Subject: Subject: tmpfs: distribute interleave better across nodes
Patches currently in -mm which might be from nzimmer@xxxxxxx are
tmpfs-distribute-interleave-better-across-nodes.patch
shmem-provide-vm_ops-when-also-providing-a-mem-policy.patch
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