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

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On 09/14/2015 04:12 PM, Vitaly Wool wrote:
> On Mon, Sep 14, 2015 at 4:01 PM, Vlastimil Babka <vbabka@suse.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
>

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[PATCH 0/3] allow zram to use zbud as underlying allocator Vitaly Wool <vitalywool@gmail.com> - 2015-09-14 15:50 +0200
  [PATCH 1/3] zram: make max_zpage_size configurable Vitaly Wool <vitalywool@gmail.com> - 2015-09-14 16:00 +0200
    Re: [PATCH 1/3] zram: make max_zpage_size configurable Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com> - 2015-09-15 03:10 +0200
      Re: [PATCH 1/3] zram: make max_zpage_size configurable Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com> - 2015-09-15 09:40 +0200
    Re: [PATCH 1/3] zram: make max_zpage_size configurable Dan Streetman <ddstreet@ieee.org> - 2015-09-15 07:50 +0200
      Re: [PATCH 1/3] zram: make max_zpage_size configurable Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com> - 2015-09-15 08:10 +0200
  [PATCH 3/3] zram: use common zpool interface Vitaly Wool <vitalywool@gmail.com> - 2015-09-14 16:00 +0200
    Re: [PATCH 3/3] zram: use common zpool interface Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com> - 2015-09-15 03:20 +0200
      Re: [PATCH 3/3] zram: use common zpool interface Dan Streetman <ddstreet@ieee.org> - 2015-09-15 08:10 +0200
  [PATCH 2/3] zpool/zsmalloc/zbud: align on interfaces Vitaly Wool <vitalywool@gmail.com> - 2015-09-14 16:00 +0200
    Re: [PATCH 2/3] zpool/zsmalloc/zbud: align on interfaces Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com> - 2015-09-15 03:10 +0200
      Re: [PATCH 2/3] zpool/zsmalloc/zbud: align on interfaces Dan Streetman <ddstreet@ieee.org> - 2015-09-15 07:10 +0200
  Re: [PATCH 0/3] allow zram to use zbud as underlying allocator Vlastimil Babka <vbabka@suse.cz> - 2015-09-14 16:10 +0200
    Re: [PATCH 0/3] allow zram to use zbud as underlying allocator Vlastimil Babka <vbabka@suse.cz> - 2015-09-14 16:20 +0200
      Re: [PATCH 0/3] allow zram to use zbud as underlying allocator Dan Streetman <ddstreet@ieee.org> - 2015-09-15 06:10 +0200
        Re: [PATCH 0/3] allow zram to use zbud as underlying allocator Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com> - 2015-09-15 06:30 +0200
          Re: [PATCH 0/3] allow zram to use zbud as underlying allocator Vlastimil Babka <vbabka@suse.cz> - 2015-09-17 08:30 +0200
            Re: [PATCH 0/3] allow zram to use zbud as underlying allocator Sergey Senozhatsky <sergey.senozhatsky@gmail.com> - 2015-09-17 11:30 +0200
    Re: [PATCH 0/3] allow zram to use zbud as underlying allocator Vitaly Wool <vitalywool@gmail.com> - 2015-09-14 16:20 +0200
  Re: [PATCH 0/3] allow zram to use zbud as underlying allocator Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com> - 2015-09-15 02:50 +0200
  Re: [PATCH 0/3] allow zram to use zbud as underlying allocator Minchan Kim <minchan@kernel.org> - 2015-09-15 08:20 +0200

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