linux-kernel - Re: [PATCH] mm: compact: fix zoneindex in compact

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Date:	Thu, 19 May 2016 14:13:43 +0200
From:	Vlastimil Babka <vbabka@...e.cz>
To:	Chen Feng <puck.chen@...ilicon.com>, mhocko@...e.com,
	kirill.shutemov@...ux.intel.com, hannes@...xchg.org, tj@...nel.org,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>
Cc:	suzhuangluan@...ilicon.com, dan.zhao@...ilicon.com,
	qijiwen@...ilicon.com, xuyiping@...ilicon.com,
	oliver.fu@...ilicon.com, puck.chen@...mail.com
Subject: Re: [PATCH] mm: compact: fix zoneindex in compact

On 05/19/2016 02:11 PM, Vlastimil Babka wrote:
> On 05/19/2016 01:58 PM, Chen Feng wrote:
>> While testing the kcompactd in my platform 3G MEM only DMA ZONE.
>> I found the kcompactd never wakeup. It seems the zoneindex
>> has already minus 1 before. So the traverse here should be <=.
> 
> Ouch, thanks!
> 
>> Signed-off-by: Chen Feng <puck.chen@...ilicon.com>
> 
> Fixes: 0f87baf4f7fb ("mm: wake kcompactd before kswapd's short sleep")

Bah, not that one.

Fixes: accf62422b3a ("mm, kswapd: replace kswapd compaction with waking
up kcompactd")

> Cc: stable@...r.kernel.org
> Acked-by: Vlastimil Babka <vbabka@...e.cz>
> 
>> ---
>>  mm/compaction.c | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/mm/compaction.c b/mm/compaction.c
>> index 8fa2540..e5122d9 100644
>> --- a/mm/compaction.c
>> +++ b/mm/compaction.c
>> @@ -1742,7 +1742,7 @@ static bool kcompactd_node_suitable(pg_data_t *pgdat)
>>  	struct zone *zone;
>>  	enum zone_type classzone_idx = pgdat->kcompactd_classzone_idx;
>>  
>> -	for (zoneid = 0; zoneid < classzone_idx; zoneid++) {
>> +	for (zoneid = 0; zoneid <= classzone_idx; zoneid++) {
>>  		zone = &pgdat->node_zones[zoneid];
>>  
>>  		if (!populated_zone(zone))
>>
> 
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