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Date: Mon, 14 Sep 2015 16:14:25 +0200 From: Vlastimil Babka <vbabka@...e.cz> To: Vitaly Wool <vitalywool@...il.com> Cc: minchan@...nel.org, sergey.senozhatsky@...il.com, ddstreet@...e.org, LKML <linux-kernel@...r.kernel.org>, linux-mm@...ck.org Subject: Re: [PATCH 0/3] allow zram to use zbud as underlying allocator On 09/14/2015 04:12 PM, Vitaly Wool wrote: > On Mon, Sep 14, 2015 at 4:01 PM, Vlastimil Babka <vbabka@...e.cz> wrote: >> >> On 09/14/2015 03:49 PM, 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 >> >> >> I'm sure Minchan will want to hear the details of that :) >> >>> operation. By using zbud I lose in compression ratio but gain in >>> determinism, lower latencies and lower fragmentation, so in the coming >> >> >> I doubt the "lower fragmentation" part given what I've read about the design of zbud and zsmalloc? > > As it turns out, I see more cases of compaction kicking in and > significantly more compact_stalls with zsmalloc. Interesting, I thought that zsmalloc doesn't need contiguous high-order pages. > ~vitaly > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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