The patch titled
Subject: tmpfs: implement NUMA node interleaving
has been added to the -mm tree. Its filename is
tmpfs-implement-numa-node-interleaving.patch
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From: Nathan Zimmer <nzimmer@xxxxxxx>
Subject: tmpfs: implement NUMA node interleaving
When tmpfs has the memory policy interleaved it always starts allocating
at each file at node 0. When there are many small files the lower nodes
fill up disproportionately.
This patch attempts to spread out node usage by starting files at nodes
other then 0. I disturbed the addr parameter since alloc_pages_vma will
only use it when the policy is MPOL_INTERLEAVE. Random was picked over
using another variable which would require some sort of contention
management.
Signed-off-by: Nathan T Zimmer <nzimmer@xxxxxxx>
Cc: Christoph Lameter <cl@xxxxxxxxx>
Cc: Nick Piggin <npiggin@xxxxxxxxx>
Cc: Hugh Dickins <hughd@xxxxxxxxxx>
Cc: Lee Schermerhorn <lee.schermerhorn@xxxxxx>
Acked-by: Rik van Riel <riel@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/shmem_fs.h | 1 +
mm/shmem.c | 3 ++-
2 files changed, 3 insertions(+), 1 deletion(-)
diff -puN include/linux/shmem_fs.h~tmpfs-implement-numa-node-interleaving include/linux/shmem_fs.h
--- a/include/linux/shmem_fs.h~tmpfs-implement-numa-node-interleaving
+++ a/include/linux/shmem_fs.h
@@ -17,6 +17,7 @@ struct shmem_inode_info {
char *symlink; /* unswappable short symlink */
};
struct shared_policy policy; /* NUMA memory alloc policy */
+ unsigned long node_offset; /* bias for interleaved nodes */
struct list_head swaplist; /* chain of maybes on swap */
struct list_head xattr_list; /* list of shmem_xattr */
struct inode vfs_inode;
diff -puN mm/shmem.c~tmpfs-implement-numa-node-interleaving mm/shmem.c
--- a/mm/shmem.c~tmpfs-implement-numa-node-interleaving
+++ a/mm/shmem.c
@@ -929,7 +929,7 @@ static struct page *shmem_alloc_page(gfp
/*
* alloc_page_vma() will drop the shared policy reference
*/
- return alloc_page_vma(gfp, &pvma, 0);
+ return alloc_page_vma(gfp, &pvma, info->node_offset << PAGE_SHIFT );
}
#else /* !CONFIG_NUMA */
#ifdef CONFIG_TMPFS
@@ -1357,6 +1357,7 @@ static struct inode *shmem_get_inode(str
inode->i_fop = &shmem_file_operations;
mpol_shared_policy_init(&info->policy,
shmem_get_sbmpol(sbinfo));
+ info->node_offset = node_random(&node_online_map);
break;
case S_IFDIR:
inc_nlink(inode);
_
Subject: Subject: tmpfs: implement NUMA node interleaving
Patches currently in -mm which might be from nzimmer@xxxxxxx are
tmpfs-implement-numa-node-interleaving.patch
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