Patchwork [1/2] mm: vmscan: Correct use of pgdat_balanced in sleeping_prematurely

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Submitter Mel Gorman
Date May 16, 2011, 3:06 p.m.
Message ID <1305558417-24354-2-git-send-email-mgorman@suse.de>
Download mbox | patch
Permalink /patch/95771/
State Not Applicable
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Mel Gorman - May 16, 2011, 3:06 p.m.
From: Johannes Weiner <hannes@cmpxchg.org>

Johannes Weiner poined out that the logic in commit [1741c877: mm:
kswapd: keep kswapd awake for high-order allocations until a percentage
of the node is balanced] is backwards. Instead of allowing kswapd to go
to sleep when balancing for high order allocations, it keeps it kswapd
running uselessly.

Signed-off-by: Mel Gorman <mgorman@suse.de>
Reviewed-by: Rik van Riel <riel@redhat.com>
---
 mm/vmscan.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
Johannes Weiner - May 16, 2011, 3:26 p.m.
On Mon, May 16, 2011 at 04:06:56PM +0100, Mel Gorman wrote:
> From: Johannes Weiner <hannes@cmpxchg.org>
> 
> Johannes Weiner poined out that the logic in commit [1741c877: mm:
> kswapd: keep kswapd awake for high-order allocations until a percentage
> of the node is balanced] is backwards. Instead of allowing kswapd to go
> to sleep when balancing for high order allocations, it keeps it kswapd
> running uselessly.
> 
> Signed-off-by: Mel Gorman <mgorman@suse.de>
> Reviewed-by: Rik van Riel <riel@redhat.com>

Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
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MinChan Kim - May 16, 2011, 11:05 p.m.
On Tue, May 17, 2011 at 12:06 AM, Mel Gorman <mgorman@suse.de> wrote:
> From: Johannes Weiner <hannes@cmpxchg.org>
>
> Johannes Weiner poined out that the logic in commit [1741c877: mm:
> kswapd: keep kswapd awake for high-order allocations until a percentage
> of the node is balanced] is backwards. Instead of allowing kswapd to go
> to sleep when balancing for high order allocations, it keeps it kswapd
> running uselessly.
>
> Signed-off-by: Mel Gorman <mgorman@suse.de>
> Reviewed-by: Rik van Riel <riel@redhat.com>
Reviewed-by: Minchan Kim <minchan.kim@gmail.com>
Wu Fengguang - May 17, 2011, 5:26 a.m.
On Mon, May 16, 2011 at 05:26:08PM +0200, Johannes Weiner wrote:
> On Mon, May 16, 2011 at 04:06:56PM +0100, Mel Gorman wrote:
> > From: Johannes Weiner <hannes@cmpxchg.org>
> > 
> > Johannes Weiner poined out that the logic in commit [1741c877: mm:
> > kswapd: keep kswapd awake for high-order allocations until a percentage
> > of the node is balanced] is backwards. Instead of allowing kswapd to go
> > to sleep when balancing for high order allocations, it keeps it kswapd
> > running uselessly.
> > 
> > Signed-off-by: Mel Gorman <mgorman@suse.de>
> > Reviewed-by: Rik van Riel <riel@redhat.com>
> 
> Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>

Reviewed-by: Wu Fengguang <fengguang.wu@intel.com>
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Patch

diff --git a/mm/vmscan.c b/mm/vmscan.c
index f6b435c..af24d1e 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -2286,7 +2286,7 @@  static bool sleeping_prematurely(pg_data_t *pgdat, int order, long remaining,
 	 * must be balanced
 	 */
 	if (order)
-		return pgdat_balanced(pgdat, balanced, classzone_idx);
+		return !pgdat_balanced(pgdat, balanced, classzone_idx);
 	else
 		return !all_zones_ok;
 }