+ mm-add-cond_resched-in-gather_pte_stats.patch added to -mm tree

+ mm-add-cond_resched-in-gather_pte_stats.patch added to -mm tree

[akpm]

The patch titled
     Subject: mm: add cond_resched() in gather_pte_stats()
has been added to the -mm tree.  Its filename is
     mm-add-cond_resched-in-gather_pte_stats.patch

This patch should soon appear at
    http://ozlabs.org/~akpm/mmots/broken-out/mm-add-cond_resched-in-gather_pte_stats.patch
and later at
    http://ozlabs.org/~akpm/mmotm/broken-out/mm-add-cond_resched-in-gather_pte_stats.patch

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------------------------------------------------------
From: Hugh Dickins <hughd@google.com>
Subject: mm: add cond_resched() in gather_pte_stats()

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@google.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 fs/proc/task_mmu.c |    1 +
 1 file changed, 1 insertion(+)

diff -puN fs/proc/task_mmu.c~mm-add-cond_resched-in-gather_pte_stats fs/proc/task_mmu.c
--- a/fs/proc/task_mmu.c~mm-add-cond_resched-in-gather_pte_stats
+++ a/fs/proc/task_mmu.c
@@ -1588,6 +1588,7 @@ 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 -mm which might be from hughd@google.com are

mm-add-three-more-cond_resched-in-swapoff.patch
mm-add-cond_resched-in-gather_pte_stats.patch