Re: [PATCH] mm/compaction: __compact_pgdat() code cleanuup

[Joonsoo Kim]

On Tue, Nov 24, 2015 at 09:49:49AM +0100, Vlastimil Babka wrote:
> On 11/24/2015 07:24 AM, Joonsoo Kim wrote:
> >This patch uses is_via_compact_memory() to distinguish direct compaction.
> >And it also reduces indentation on compaction_defer_reset
> >by filtering failure case. There is no functional change.
> >
> >Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>
> >---
> >  mm/compaction.c | 15 +++++++++------
> >  1 file changed, 9 insertions(+), 6 deletions(-)
> >
> >diff --git a/mm/compaction.c b/mm/compaction.c
> >index de3e1e7..2b1a15e 100644
> >--- a/mm/compaction.c
> >+++ b/mm/compaction.c
> >@@ -1658,14 +1658,17 @@ static void __compact_pgdat(pg_data_t *pgdat, struct compact_control *cc)
> >  				!compaction_deferred(zone, cc->order))
> >  			compact_zone(zone, cc);
> >
> >-		if (cc->order > 0) {
> >-			if (zone_watermark_ok(zone, cc->order,
> >-						low_wmark_pages(zone), 0, 0))
> >-				compaction_defer_reset(zone, cc->order, false);
> >-		}
> >-
> >  		VM_BUG_ON(!list_empty(&cc->freepages));
> >  		VM_BUG_ON(!list_empty(&cc->migratepages));
> >+
> >+		if (is_via_compact_memory(cc->order))
> >+			continue;
> 
> That's fine.
> 
> >+		if (!zone_watermark_ok(zone, cc->order,
> >+				low_wmark_pages(zone), 0, 0))
> >+			continue;
> >+
> >+		compaction_defer_reset(zone, cc->order, false);
> 
> Here I'd personally find the way of "if(watermark_ok) defer_reset()"
> logic easier to follow.

Okay. Will change it.

Thanks.
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