linux-kernel - Re: [PATCH V2] Allow compaction of unevictable pages

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Date:	Mon, 09 Mar 2015 16:39:44 -0400
From:	Eric B Munson <emunson@...mai.com>
To:	David Rientjes <rientjes@...gle.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Vlastimil Babka <vbabka@...e.cz>,
	Thomas Gleixner <tglx@...utronix.de>,
	Christoph Lameter <cl@...ux.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Mel Gorman <mgorman@...e.de>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH V2] Allow compaction of unevictable pages

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On 03/09/2015 03:57 PM, David Rientjes wrote:
> On Mon, 9 Mar 2015, Eric B Munson wrote:
> 
>> diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h 
>> index f279d9c..599fb01 100644 --- a/include/linux/mmzone.h +++
>> b/include/linux/mmzone.h @@ -232,8 +232,6 @@ struct lruvec { 
>> #define ISOLATE_UNMAPPED	((__force isolate_mode_t)0x2) /* Isolate
>> for asynchronous migration */ #define ISOLATE_ASYNC_MIGRATE
>> ((__force isolate_mode_t)0x4) -/* Isolate unevictable pages */ 
>> -#define ISOLATE_UNEVICTABLE	((__force isolate_mode_t)0x8)
>> 
>> /* LRU Isolation modes. */ typedef unsigned __bitwise__
>> isolate_mode_t; diff --git a/mm/compaction.c b/mm/compaction.c 
>> index 8c0d945..4a8ea87 100644 --- a/mm/compaction.c +++
>> b/mm/compaction.c @@ -872,8 +872,7 @@
>> isolate_migratepages_range(struct compact_control *cc, unsigned
>> long start_pfn, if (!pageblock_pfn_to_page(pfn, block_end_pfn,
>> cc->zone)) continue;
>> 
>> -		pfn = isolate_migratepages_block(cc, pfn, block_end_pfn, -
>> ISOLATE_UNEVICTABLE); +		pfn = isolate_migratepages_block(cc,
>> pfn, block_end_pfn, 0);
>> 
>> /* * In case of fatal failure, release everything that might diff
>> --git a/mm/vmscan.c b/mm/vmscan.c index 5e8eadd..3b2a444 100644 
>> --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -1234,10 +1234,6 @@ int
>> __isolate_lru_page(struct page *page, isolate_mode_t mode) if
>> (!PageLRU(page)) return ret;
>> 
>> -	/* Compaction should not handle unevictable pages but CMA can
>> do so */ -	if (PageUnevictable(page) && !(mode &
>> ISOLATE_UNEVICTABLE)) -		return ret; - ret = -EBUSY;
>> 
>> /*
> 
> Looks better!
> 
> I think there's one more cleanup we can do now thanks to your
> patch: dropping the isolate_mode_t formal from
> isolate_migratepages_block() entirely since that function can now
> just do
> 
> const isolate_mode_t isolate_mode = (cc->mode == MIGRATE_ASYNC ?
> ISOLATE_ASYNC_MIGRATE : 0);
> 
> since we already pass in the struct compact_control and
> isolate_mode only depends on MIGRATE_ASYNC or not.
> 
> If you'd like to fold that change into this patch because it's
> logically allowed by it, feel free to add my enthusiastic
> 
> Acked-by: David Rientjes <rientjes@...gle.com>
> 
> Otherwise, I'll just send a change on top of it if you don't have
> time.

I'll V3 out shortly with that change.

Thanks for the review.

Eric
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