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

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On 09/15/2015 06:22 AM, Sergey Senozhatsky wrote:
> On (09/15/15 00:08), Dan Streetman wrote:
> [..]
>
> correct. a bit of internals: we don't scan all the zspages every
> time. each class has stats for allocated used objects, allocated
> used objects, etc. so we 'compact' only classes that can be
> compacted:
>
>   static unsigned long zs_can_compact(struct size_class *class)
>   {
>           unsigned long obj_wasted;
>
>           obj_wasted = zs_stat_get(class, OBJ_ALLOCATED) -
>                   zs_stat_get(class, OBJ_USED);
>
>           obj_wasted /= get_maxobj_per_zspage(class->size,
>                           class->pages_per_zspage);
>
>           return obj_wasted * class->pages_per_zspage;
>   }
>
> if we can free any zspages (which is at least one page), then we
> attempt to do so.
>
> is compaction the root cause of the symptoms Vitaly observe?

He mentioned the "compact_stalls" counter which in /proc/vmstat is for 
the traditional physical memory compaction, not the zsmalloc-specific 
one. Which would imply high-order allocations. Does zsmalloc try them 
first before falling back to the order-0 zspages linked together manually?

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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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