This is a note to let you know that I've just added the patch titled
mm: add cond_resched() in gather_pte_stats()
to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
mm-add-cond_resched-in-gather_pte_stats.patch
and it can be found in the queue-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From a66c0410b97c07a5708881198528ce724f7a3226 Mon Sep 17 00:00:00 2001
From: Hugh Dickins <hughd@xxxxxxxxxx>
Date: Mon, 12 Dec 2016 16:44:47 -0800
Subject: mm: add cond_resched() in gather_pte_stats()
From: Hugh Dickins <hughd@xxxxxxxxxx>
commit a66c0410b97c07a5708881198528ce724f7a3226 upstream.
The other pagetable walks in task_mmu.c have a cond_resched() after
walking their ptes: add a cond_resched() in gather_pte_stats() too, for
reading /proc/<id>/numa_maps. Only pagemap_pmd_range() has a
cond_resched() in its (unusually expensive) pmd_trans_huge case: more
should probably be added, but leave them unchanged for now.
Link: http://lkml.kernel.org/r/alpine.LSU.2.11.1612052157400.13021@eggly.anvils
Signed-off-by: Hugh Dickins <hughd@xxxxxxxxxx>
Acked-by: Michal Hocko <mhocko@xxxxxxxx>
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Cc: Gerald Schaefer <gerald.schaefer@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Reported-by: Chen si <cici.cs@xxxxxxxxxxxxxxx>
Signed-off-by: Baoyou Xie <baoyou.xie@xxxxxxxxxx>
Signed-off-by: Wen Yang <wenyang@xxxxxxxxxxxxxxxxx>
Signed-off-by: Zijiang Huang <zijiang.hzj@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/proc/task_mmu.c | 1 +
1 file changed, 1 insertion(+)
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -1609,6 +1609,7 @@ static int gather_pte_stats(pmd_t *pmd,
} while (pte++, addr += PAGE_SIZE, addr != end);
pte_unmap_unlock(orig_pte, ptl);
+ cond_resched();
return 0;
}
#ifdef CONFIG_HUGETLB_PAGE
Patches currently in stable-queue which might be from hughd@xxxxxxxxxx are
queue-4.9/mm-add-cond_resched-in-gather_pte_stats.patch
