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mm/vmalloc.c: add a schedule point to vmalloc()

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It is not uncommon on busy servers to get stuck hundred of ms in
vmalloc() calls (like file descriptor expansions).

Add a cond_resched() to __vmalloc_area_node() to be gentle to
other tasks.

[akpm@linux-foundation.org: only do it for __GFP_WAIT, per David]
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Hugh Dickins <hughd@google.com>
Acked-by: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Eric Dumazet 2014-08-06 16:06:25 -07:00 committed by Linus Torvalds
parent 54980b93c0
commit 660654f90e
1 changed files with 2 additions and 0 deletions
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2
mm/vmalloc.c
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@ -1602,6 +1602,8 @@ static void *__vmalloc_area_node(struct vm_struct *area, gfp_t gfp_mask,
goto fail;
}
area->pages[i] = page;
if (gfp_mask & __GFP_WAIT)
cond_resched();
}
if (map_vm_area(area, prot, &pages))