提交 09c231cb 编写于 作者: N Nathan Zimmer 提交者: Linus Torvalds

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: NNathan Zimmer <nzimmer@sgi.com>
Signed-off-by: NHugh Dickins <hughd@google.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Nick Piggin <npiggin@gmail.com>
Cc: Lee Schermerhorn <lee.schermerhorn@hp.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Andi Kleen <andi@firstfloor.org>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
上级 6527af5d
...@@ -929,7 +929,8 @@ static struct page *shmem_swapin(swp_entry_t swap, gfp_t gfp, ...@@ -929,7 +929,8 @@ static struct page *shmem_swapin(swp_entry_t swap, gfp_t gfp,
/* Create a pseudo vma that just contains the policy */ /* Create a pseudo vma that just contains the policy */
pvma.vm_start = 0; 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_ops = NULL;
pvma.vm_policy = spol; pvma.vm_policy = spol;
return swapin_readahead(swap, gfp, &pvma, 0); return swapin_readahead(swap, gfp, &pvma, 0);
...@@ -942,7 +943,8 @@ static struct page *shmem_alloc_page(gfp_t gfp, ...@@ -942,7 +943,8 @@ static struct page *shmem_alloc_page(gfp_t gfp,
/* Create a pseudo vma that just contains the policy */ /* Create a pseudo vma that just contains the policy */
pvma.vm_start = 0; 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_ops = NULL;
pvma.vm_policy = mpol_shared_policy_lookup(&info->policy, index); pvma.vm_policy = mpol_shared_policy_lookup(&info->policy, index);
......
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