diff options
| author | Jia He <[email protected]> | 2016-08-02 14:02:31 -0700 |
|---|---|---|
| committer | Linus Torvalds <[email protected]> | 2016-08-02 17:31:41 -0400 |
| commit | 649920c6ab93429b94bc7c1aa7c0e8395351be32 (patch) | |
| tree | a727d3cc63d0841834aa2f42a9951893d2dae11a | |
| parent | 117dec978cf64e8e96f13d0cf4891ff77c9acf55 (diff) | |
mm/hugetlb: avoid soft lockup in set_max_huge_pages()
In powerpc servers with large memory(32TB), we watched several soft
lockups for hugepage under stress tests.
The call traces are as follows:
1.
get_page_from_freelist+0x2d8/0xd50
__alloc_pages_nodemask+0x180/0xc20
alloc_fresh_huge_page+0xb0/0x190
set_max_huge_pages+0x164/0x3b0
2.
prep_new_huge_page+0x5c/0x100
alloc_fresh_huge_page+0xc8/0x190
set_max_huge_pages+0x164/0x3b0
This patch fixes such soft lockups. It is safe to call cond_resched()
there because it is out of spin_lock/unlock section.
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Jia He <[email protected]>
Reviewed-by: Naoya Horiguchi <[email protected]>
Acked-by: Michal Hocko <[email protected]>
Acked-by: Dave Hansen <[email protected]>
Cc: Mike Kravetz <[email protected]>
Cc: "Kirill A. Shutemov" <[email protected]>
Cc: Paul Gortmaker <[email protected]>
Cc: <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
| -rw-r--r-- | mm/hugetlb.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/mm/hugetlb.c b/mm/hugetlb.c index f904246a8fd5..619e00d82c5d 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -2216,6 +2216,10 @@ static unsigned long set_max_huge_pages(struct hstate *h, unsigned long count, * and reducing the surplus. */ spin_unlock(&hugetlb_lock); + + /* yield cpu to avoid soft lockup */ + cond_resched(); + if (hstate_is_gigantic(h)) ret = alloc_fresh_gigantic_page(h, nodes_allowed); else |