linux-kernel - Re: [RFC][PATCH v3 1/5] mm/zsmalloc: introduce class auto-compaction

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Message-ID: <20160314082004.GE542@swordfish>
Date:	Mon, 14 Mar 2016 17:20:04 +0900
From:	Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
To:	Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
Cc:	Minchan Kim <minchan@...nel.org>,
	Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Joonsoo Kim <js1304@...il.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC][PATCH v3 1/5] mm/zsmalloc: introduce class auto-compaction

On (03/14/16 16:41), Sergey Senozhatsky wrote:
[..]
> you mean that __zs_compact() instead of just checking per-class
> zs_can_compact() should check global pool ratio and bail out if
> compaction of class Z has dropped the overall fragmentation ratio
> below some watermark?
> 
> my logic was that
>  -- suppose we have class A with fragmentation ratio 49% and class B
>  with 8% of wasted pages, so the overall pool fragmentation is
>  (50 + 10)/ 2 < 30%, while we still have almost 50% fragmented class.

  "(49 + 8) / 2 < 30%"

	-ss