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| author | Dave Hansen <dave.hansen@linux.intel.com> | 2015-11-06 03:50:20 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2015-11-06 04:34:48 +0100 |
| commit | e0ec90ee7e6f6cbaa6d59ffb48d2a7af5e80e61d (patch) | |
| tree | 2e48efdf409a59c0853f7a11285dcfcd186403c4 /mm | |
| parent | mm, hugetlb: use memory policy when available (diff) | |
| download | linux-e0ec90ee7e6f6cbaa6d59ffb48d2a7af5e80e61d.tar.xz linux-e0ec90ee7e6f6cbaa6d59ffb48d2a7af5e80e61d.zip | |
mm, hugetlbfs: optimize when NUMA=n
My recent patch "mm, hugetlb: use memory policy when available" added some
bloat to hugetlb.o. This patch aims to get some of the bloat back,
especially when NUMA is not in play.
It does this with an implicit #ifdef and marking some things static that
should have been static in my first patch. It also makes the warnings
only VM_WARN_ON()s. They were responsible for a pretty big chunk of the
bloat.
Doing this gets our NUMA=n text size back to a wee bit _below_ where we
started before the original patch.
It also shaves a bit of space off the NUMA=y case, but not much.
Enforcing the mempolicy definitely takes some text and it's hard to avoid.
size(1) output:
text data bss dec hex filename
30745 3433 2492 36670 8f3e hugetlb.o.nonuma.baseline
31305 3755 2492 37552 92b0 hugetlb.o.nonuma.patch1
30713 3433 2492 36638 8f1e hugetlb.o.nonuma.patch2 (this patch)
25235 473 41276 66984 105a8 hugetlb.o.numa.baseline
25715 475 41276 67466 1078a hugetlb.o.numa.patch1
25491 473 41276 67240 106a8 hugetlb.o.numa.patch2 (this patch)
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Hillf Danton <hillf.zj@alibaba-inc.com>
Cc: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/hugetlb.c | 18 |
1 files changed, 13 insertions, 5 deletions
diff --git a/mm/hugetlb.c b/mm/hugetlb.c index 899f6a81e77a..241de2712b36 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -1455,9 +1455,14 @@ static struct page *__hugetlb_alloc_buddy_huge_page(struct hstate *h, /* * We need a VMA to get a memory policy. If we do not - * have one, we use the 'nid' argument + * have one, we use the 'nid' argument. + * + * The mempolicy stuff below has some non-inlined bits + * and calls ->vm_ops. That makes it hard to optimize at + * compile-time, even when NUMA is off and it does + * nothing. This helps the compiler optimize it out. */ - if (!vma) { + if (!IS_ENABLED(CONFIG_NUMA) || !vma) { /* * If a specific node is requested, make sure to * get memory from there, but only when a node @@ -1474,7 +1479,8 @@ static struct page *__hugetlb_alloc_buddy_huge_page(struct hstate *h, /* * OK, so we have a VMA. Fetch the mempolicy and try to - * allocate a huge page with it. + * allocate a huge page with it. We will only reach this + * when CONFIG_NUMA=y. */ do { struct page *page; @@ -1520,8 +1526,8 @@ static struct page *__alloc_buddy_huge_page(struct hstate *h, * we can call this function, not both. */ if (vma || (addr != -1)) { - WARN_ON_ONCE(addr == -1); - WARN_ON_ONCE(nid != NUMA_NO_NODE); + VM_WARN_ON_ONCE(addr == -1); + VM_WARN_ON_ONCE(nid != NUMA_NO_NODE); } /* * Assume we will successfully allocate the surplus page to @@ -1585,6 +1591,7 @@ static struct page *__alloc_buddy_huge_page(struct hstate *h, * NUMA_NO_NODE, which means that it may be allocated * anywhere. */ +static struct page *__alloc_buddy_huge_page_no_mpol(struct hstate *h, int nid) { unsigned long addr = -1; @@ -1595,6 +1602,7 @@ struct page *__alloc_buddy_huge_page_no_mpol(struct hstate *h, int nid) /* * Use the VMA's mpolicy to allocate a huge page from the buddy. */ +static struct page *__alloc_buddy_huge_page_with_mpol(struct hstate *h, struct vm_area_struct *vma, unsigned long addr) { |