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author | Christoph Lameter <clameter@engr.sgi.com> | 2006-01-06 00:10:46 -0800 |
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committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-01-06 08:33:23 -0800 |
commit | 5da7ca86078964cbfe6c83efc1205904587706fe (patch) | |
tree | a64a7824e90b42d6fdd71e6cb652362beb8983a1 /mm/mempolicy.c | |
parent | 96df9333c94d7d5aeceb21f6c5e7ae8ff34753cf (diff) | |
download | kernel_samsung_smdk4412-5da7ca86078964cbfe6c83efc1205904587706fe.zip kernel_samsung_smdk4412-5da7ca86078964cbfe6c83efc1205904587706fe.tar.gz kernel_samsung_smdk4412-5da7ca86078964cbfe6c83efc1205904587706fe.tar.bz2 |
[PATCH] Add NUMA policy support for huge pages.
The huge_zonelist() function in the memory policy layer provides an list of
zones ordered by NUMA distance. The hugetlb layer will walk that list looking
for a zone that has available huge pages but is also in the nodeset of the
current cpuset.
This patch does not contain the folding of find_or_alloc_huge_page() that was
controversial in the earlier discussion.
Signed-off-by: Christoph Lameter <clameter@sgi.com>
Cc: Andi Kleen <ak@muc.de>
Acked-by: William Lee Irwin III <wli@holomorphy.com>
Cc: Adam Litke <agl@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'mm/mempolicy.c')
-rw-r--r-- | mm/mempolicy.c | 39 |
1 files changed, 30 insertions, 9 deletions
diff --git a/mm/mempolicy.c b/mm/mempolicy.c index 72f402c..45c51ac 100644 --- a/mm/mempolicy.c +++ b/mm/mempolicy.c @@ -785,6 +785,34 @@ static unsigned offset_il_node(struct mempolicy *pol, return nid; } +/* Determine a node number for interleave */ +static inline unsigned interleave_nid(struct mempolicy *pol, + struct vm_area_struct *vma, unsigned long addr, int shift) +{ + if (vma) { + unsigned long off; + + off = vma->vm_pgoff; + off += (addr - vma->vm_start) >> shift; + return offset_il_node(pol, vma, off); + } else + return interleave_nodes(pol); +} + +/* Return a zonelist suitable for a huge page allocation. */ +struct zonelist *huge_zonelist(struct vm_area_struct *vma, unsigned long addr) +{ + struct mempolicy *pol = get_vma_policy(current, vma, addr); + + if (pol->policy == MPOL_INTERLEAVE) { + unsigned nid; + + nid = interleave_nid(pol, vma, addr, HPAGE_SHIFT); + return NODE_DATA(nid)->node_zonelists + gfp_zone(GFP_HIGHUSER); + } + return zonelist_policy(GFP_HIGHUSER, pol); +} + /* Allocate a page in interleaved policy. Own path because it needs to do special accounting. */ static struct page *alloc_page_interleave(gfp_t gfp, unsigned order, @@ -833,15 +861,8 @@ alloc_page_vma(gfp_t gfp, struct vm_area_struct *vma, unsigned long addr) if (unlikely(pol->policy == MPOL_INTERLEAVE)) { unsigned nid; - if (vma) { - unsigned long off; - off = vma->vm_pgoff; - off += (addr - vma->vm_start) >> PAGE_SHIFT; - nid = offset_il_node(pol, vma, off); - } else { - /* fall back to process interleaving */ - nid = interleave_nodes(pol); - } + + nid = interleave_nid(pol, vma, addr, PAGE_SHIFT); return alloc_page_interleave(gfp, 0, nid); } return __alloc_pages(gfp, 0, zonelist_policy(gfp, pol)); |