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authorJohannes Weiner <hannes@cmpxchg.org>2014-08-06 16:05:49 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2014-08-06 18:01:17 -0700
commitd51d885bbb137cc8e1704e76be1846c5e0d5e8b4 (patch)
treefd79f2485ac47325386873cbe0cd7666f0339725 /mm
parent28c34c291e746aab1c2bfd6d6609b2e47fa0978b (diff)
mm: huge_memory: use GFP_TRANSHUGE when charging huge pages
Transparent huge page charges prefer falling back to regular pages rather than spending a lot of time in direct reclaim. Desired reclaim behavior is usually declared in the gfp mask, but THP charges use GFP_KERNEL and then rely on the fact that OOM is disabled for THP charges, and that OOM-disabled charges don't retry reclaim. Needless to say, this is anything but obvious and quite error prone. Convert THP charges to use GFP_TRANSHUGE instead, which implies __GFP_NORETRY, to indicate the low-latency requirement. Signed-off-by: Johannes Weiner <hannes@cmpxchg.org> Acked-by: Michal Hocko <mhocko@suse.cz> Cc: Hugh Dickins <hughd@google.com> Cc: Tejun Heo <tj@kernel.org> Cc: Vladimir Davydov <vdavydov@parallels.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/huge_memory.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 4b95ff4120f5..24e354c2b59e 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -827,7 +827,7 @@ int do_huge_pmd_anonymous_page(struct mm_struct *mm, struct vm_area_struct *vma,
count_vm_event(THP_FAULT_FALLBACK);
return VM_FAULT_FALLBACK;
}
- if (unlikely(mem_cgroup_charge_anon(page, mm, GFP_KERNEL))) {
+ if (unlikely(mem_cgroup_charge_anon(page, mm, GFP_TRANSHUGE))) {
put_page(page);
count_vm_event(THP_FAULT_FALLBACK);
return VM_FAULT_FALLBACK;
@@ -1132,7 +1132,7 @@ alloc:
goto out;
}
- if (unlikely(mem_cgroup_charge_anon(new_page, mm, GFP_KERNEL))) {
+ if (unlikely(mem_cgroup_charge_anon(new_page, mm, GFP_TRANSHUGE))) {
put_page(new_page);
if (page) {
split_huge_page(page);
@@ -2399,7 +2399,7 @@ static void collapse_huge_page(struct mm_struct *mm,
if (!new_page)
return;
- if (unlikely(mem_cgroup_charge_anon(new_page, mm, GFP_KERNEL)))
+ if (unlikely(mem_cgroup_charge_anon(new_page, mm, GFP_TRANSHUGE)))
return;
/*