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

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Date:	Fri, 25 Sep 2015 10:27:26 +0200
From:	Vitaly Wool <vitalywool@...il.com>
To:	Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
Cc:	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

> 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
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.

> 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.

~vitaly
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