linux-kernel - Re: [PATCH 0/3] allow zram to use zbud as underlying allocator

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Message-ID: <20150915004957.GA1860@swordfish>
Date:	Tue, 15 Sep 2015 09:49:57 +0900
From:	Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
To:	Vitaly Wool <vitalywool@...il.com>
Cc:	minchan@...nel.org, sergey.senozhatsky@...il.com,
	ddstreet@...e.org, linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH 0/3] allow zram to use zbud as underlying allocator

On (09/14/15 15:49), Vitaly Wool wrote:
> While using ZRAM on a small RAM footprint devices, together with KSM,
> I ran into several occasions when moving pages from compressed swap back
> into the "normal" part of RAM caused significant latencies in system operation.
> By using zbud I lose in compression ratio but gain in determinism, lower
> latencies and lower fragmentation, so in the coming patches I tried to
> generalize what I've done to enable zbud for zram so far.
> 

do you have CONFIG_PGTABLE_MAPPING enabled or disabled? or
kmap_atomic/memcpy/kunmap_atomic is not the root cause here?
can you provide more details please?

	-ss
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