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vdso: make arch_setup_additional_pages wait for mmap_sem for write killable

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most architectures are relying on mmap_sem for write in their
arch_setup_additional_pages.  If the waiting task gets killed by the oom
killer it would block oom_reaper from asynchronous address space reclaim
and reduce the chances of timely OOM resolving.  Wait for the lock in
the killable mode and return with EINTR if the task got killed while
waiting.

Signed-off-by: Michal Hocko <mhocko@suse.com>
Acked-by: Andy Lutomirski <luto@amacapital.net>	[x86 vdso]
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Michal Hocko
2016-05-23 16:25:54 -07:00
committed by Linus Torvalds
parent 91f4f94ea3
commit 6904817607
9 changed files with 21 additions and 10 deletions
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3
arch/x86/um/vdso/vma.c
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@ -61,7 +61,8 @@ int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp)
if (!vdso_enabled)
return 0;
down_write(&mm->mmap_sem);
if (down_write_killable(&mm->mmap_sem))
return -EINTR;
err = install_special_mapping(mm, um_vdso_addr, PAGE_SIZE,
VM_READ|VM_EXEC|