From: Adam Litke Date: Sat, 16 Jun 2007 17:16:15 +0000 (-0700) Subject: hugetlb: fix get_policy for stacked shared memory files X-Git-Tag: v2.6.22-rc5~2 X-Git-Url: http://pilppa.com/gitweb/?a=commitdiff_plain;h=22741925d268e8479ef66312749bd8d96ed35365;p=linux-2.6-omap-h63xx.git hugetlb: fix get_policy for stacked shared memory files Here's another breakage as a result of shared memory stacked files :( The NUMA policy for a VMA is determined by checking the following (in the order given): 1) vma->vm_ops->get_policy() (if defined) 2) vma->vm_policy (if defined) 3) task->mempolicy (if defined) 4) Fall back to default_policy By switching to stacked files for shared memory, get_policy() is now always set to shm_get_policy which is a wrapper function. This causes us to stop at step 1, which yields NULL for hugetlb instead of task->mempolicy which was the previous (and correct) result. This patch modifies the shm_get_policy() wrapper to maintain steps 1-3 for the wrapped vm_ops. (akpm: the refcounting of mempolicies is busted and this patch does nothing to improve it) Signed-off-by: Adam Litke Acked-by: William Irwin Cc: dean gaudet Cc: Christoph Lameter Cc: Andi Kleen Cc: Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/ipc/shm.c b/ipc/shm.c index 02faa54dbf5..047b823e6bf 100644 --- a/ipc/shm.c +++ b/ipc/shm.c @@ -254,8 +254,10 @@ struct mempolicy *shm_get_policy(struct vm_area_struct *vma, unsigned long addr) if (sfd->vm_ops->get_policy) pol = sfd->vm_ops->get_policy(vma, addr); - else + else if (vma->vm_policy) pol = vma->vm_policy; + else + pol = current->mempolicy; return pol; } #endif