linux-kernel - Re: [PATCH] mm: add NR

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Date:	Thu, 9 Jun 2016 10:40:52 +0900
From:	Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
To:	Minchan Kim <minchan@...nel.org>
Cc:	Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
	Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Sangseok Lee <sangseok.lee@....com>,
	Chanho Min <chanho.min@....com>,
	Chan Gyun Jeong <chan.jeong@....com>
Subject: Re: [PATCH] mm: add NR_ZSMALLOC to vmstat

Hello Minchan,

On (06/07/16 10:43), Minchan Kim wrote:
[..]
> > > It doesn't support per-zone stat which is important to show
> > > the fragmentation of the zone, for exmaple.
> > 
> > Ah, I see.
> > 
> > *just an idea*
> > 
> > may be zbud and z3fold folks will be interested as well, so may
> 
> First motivation of stat came from fragmentation problem from zsmalloc
> which caused by storing many thin zpages in a pageframe and across two
> pageframes while zswap limits the limitation by design.
> 
> Second motivation is zsmalloc can allocate page from HIGH/movable zones
> so I want to know how distribution zsmalloced pages is.
> However, zbud doesn't.

good points.
well, my "motivation" was "on 64-bit systems high zone is empty,
so those are zones below the high zone that we are interested in".

[..]
> > be more generic name and define... um, my head doesn't work toay..
> > ZALLOC... ZPOOLALLOC... hm.. I think you got the idea.
> 
> Having said that, generic name is better rather than zsmalloc. Thanks.
> I want to use *zspage* which is term from the beginning of zprojects. :)

thanks!

	-ss