linux-kernel - Re: [PATCH v2] zbud: allow up to PAGE

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Message-ID: <20150925095702.GA1049@swordfish>
Date:	Fri, 25 Sep 2015 18:57:02 +0900
From:	Sergey Senozhatsky <sergey.senozhatsky@...il.com>
To:	Vitaly Wool <vitalywool@...il.com>
Cc:	Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
	Minchan Kim <minchan@...nel.org>,
	Seth Jennings <sjennings@...iantweb.net>,
	Dan Streetman <ddstreet@...e.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Linux-MM <linux-mm@...ck.org>
Subject: Re: [PATCH v2] zbud: allow up to PAGE_SIZE allocations

On (09/25/15 10:27), Vitaly Wool wrote:
> > Have you seen those symptoms before? How did you come up to a conclusion
> > that zram->zbud will do the trick?
> 
> I have data from various tests (partially described here:
> https://lkml.org/lkml/2015/9/17/244) and once again, I'll post a reply

yeah, I guess I'm just not so bright to quickly understand what is wrong
with zsmalloc from those numbers.

> to https://lkml.org/lkml/2015/9/15/33 with more detailed test
> description and explanation why zsmalloc is not the right choice for
> me.

great, thanks.

> > If those symptoms are some sort of a recent addition, then does it help
> > when you disable zsmalloc compaction?
> 
> No it doesn't. OTOH enabled zsmalloc compaction doesn't seem to have a
> substantial effect either.

hm. ok, that was my quick guess.

	-ss
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