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Date:   Wed, 5 Jun 2019 12:53:04 -0700
From:   Shakeel Butt <shakeelb@...gle.com>
To:     Hui Zhu <teawaterz@...ux.alibaba.com>
Cc:     Dan Streetman <ddstreet@...e.org>,
        Minchan Kim <minchan@...nel.org>, ngupta@...are.org,
        sergey.senozhatsky.work@...il.com,
        Seth Jennings <sjenning@...hat.com>,
        Linux MM <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH V3 2/2] zswap: Use movable memory if zpool support
 allocate movable memory

On Wed, Jun 5, 2019 at 3:06 AM Hui Zhu <teawaterz@...ux.alibaba.com> wrote:
>
> This is the third version that was updated according to the comments
> from Sergey Senozhatsky https://lkml.org/lkml/2019/5/29/73 and
> Shakeel Butt https://lkml.org/lkml/2019/6/4/973
>
> zswap compresses swap pages into a dynamically allocated RAM-based
> memory pool.  The memory pool should be zbud, z3fold or zsmalloc.
> All of them will allocate unmovable pages.  It will increase the
> number of unmovable page blocks that will bad for anti-fragment.
>
> zsmalloc support page migration if request movable page:
>         handle = zs_malloc(zram->mem_pool, comp_len,
>                 GFP_NOIO | __GFP_HIGHMEM |
>                 __GFP_MOVABLE);
>
> And commit "zpool: Add malloc_support_movable to zpool_driver" add
> zpool_malloc_support_movable check malloc_support_movable to make
> sure if a zpool support allocate movable memory.
>
> This commit let zswap allocate block with gfp
> __GFP_HIGHMEM | __GFP_MOVABLE if zpool support allocate movable memory.
>
> Following part is test log in a pc that has 8G memory and 2G swap.
>
> Without this commit:
> ~# echo lz4 > /sys/module/zswap/parameters/compressor
> ~# echo zsmalloc > /sys/module/zswap/parameters/zpool
> ~# echo 1 > /sys/module/zswap/parameters/enabled
> ~# swapon /swapfile
> ~# cd /home/teawater/kernel/vm-scalability/
> /home/teawater/kernel/vm-scalability# export unit_size=$((9 * 1024 * 1024 * 1024))
> /home/teawater/kernel/vm-scalability# ./case-anon-w-seq
> 2717908992 bytes / 4826062 usecs = 549973 KB/s
> 2717908992 bytes / 4864201 usecs = 545661 KB/s
> 2717908992 bytes / 4867015 usecs = 545346 KB/s
> 2717908992 bytes / 4915485 usecs = 539968 KB/s
> 397853 usecs to free memory
> 357820 usecs to free memory
> 421333 usecs to free memory
> 420454 usecs to free memory
> /home/teawater/kernel/vm-scalability# cat /proc/pagetypeinfo
> Page block order: 9
> Pages per block:  512
>
> Free pages count per migrate type at order       0      1      2      3      4      5      6      7      8      9     10
> Node    0, zone      DMA, type    Unmovable      1      1      1      0      2      1      1      0      1      0      0
> Node    0, zone      DMA, type      Movable      0      0      0      0      0      0      0      0      0      1      3
> Node    0, zone      DMA, type  Reclaimable      0      0      0      0      0      0      0      0      0      0      0
> Node    0, zone      DMA, type   HighAtomic      0      0      0      0      0      0      0      0      0      0      0
> Node    0, zone      DMA, type          CMA      0      0      0      0      0      0      0      0      0      0      0
> Node    0, zone      DMA, type      Isolate      0      0      0      0      0      0      0      0      0      0      0
> Node    0, zone    DMA32, type    Unmovable      6      5      8      6      6      5      4      1      1      1      0
> Node    0, zone    DMA32, type      Movable     25     20     20     19     22     15     14     11     11      5    767
> Node    0, zone    DMA32, type  Reclaimable      0      0      0      0      0      0      0      0      0      0      0
> Node    0, zone    DMA32, type   HighAtomic      0      0      0      0      0      0      0      0      0      0      0
> Node    0, zone    DMA32, type          CMA      0      0      0      0      0      0      0      0      0      0      0
> Node    0, zone    DMA32, type      Isolate      0      0      0      0      0      0      0      0      0      0      0
> Node    0, zone   Normal, type    Unmovable   4753   5588   5159   4613   3712   2520   1448    594    188     11      0
> Node    0, zone   Normal, type      Movable     16      3    457   2648   2143   1435    860    459    223    224    296
> Node    0, zone   Normal, type  Reclaimable      0      0     44     38     11      2      0      0      0      0      0
> Node    0, zone   Normal, type   HighAtomic      0      0      0      0      0      0      0      0      0      0      0
> Node    0, zone   Normal, type          CMA      0      0      0      0      0      0      0      0      0      0      0
> Node    0, zone   Normal, type      Isolate      0      0      0      0      0      0      0      0      0      0      0
>
> Number of blocks type     Unmovable      Movable  Reclaimable   HighAtomic          CMA      Isolate
> Node 0, zone      DMA            1            7            0            0            0            0
> Node 0, zone    DMA32            4         1652            0            0            0            0
> Node 0, zone   Normal          931         1485           15            0            0            0
>
> With this commit:
> ~# echo lz4 > /sys/module/zswap/parameters/compressor
> ~# echo zsmalloc > /sys/module/zswap/parameters/zpool
> ~# echo 1 > /sys/module/zswap/parameters/enabled
> ~# swapon /swapfile
> ~# cd /home/teawater/kernel/vm-scalability/
> /home/teawater/kernel/vm-scalability# export unit_size=$((9 * 1024 * 1024 * 1024))
> /home/teawater/kernel/vm-scalability# ./case-anon-w-seq
> 2717908992 bytes / 4689240 usecs = 566020 KB/s
> 2717908992 bytes / 4760605 usecs = 557535 KB/s
> 2717908992 bytes / 4803621 usecs = 552543 KB/s
> 2717908992 bytes / 5069828 usecs = 523530 KB/s
> 431546 usecs to free memory
> 383397 usecs to free memory
> 456454 usecs to free memory
> 224487 usecs to free memory
> /home/teawater/kernel/vm-scalability# cat /proc/pagetypeinfo
> Page block order: 9
> Pages per block:  512
>
> Free pages count per migrate type at order       0      1      2      3      4      5      6      7      8      9     10
> Node    0, zone      DMA, type    Unmovable      1      1      1      0      2      1      1      0      1      0      0
> Node    0, zone      DMA, type      Movable      0      0      0      0      0      0      0      0      0      1      3
> Node    0, zone      DMA, type  Reclaimable      0      0      0      0      0      0      0      0      0      0      0
> Node    0, zone      DMA, type   HighAtomic      0      0      0      0      0      0      0      0      0      0      0
> Node    0, zone      DMA, type          CMA      0      0      0      0      0      0      0      0      0      0      0
> Node    0, zone      DMA, type      Isolate      0      0      0      0      0      0      0      0      0      0      0
> Node    0, zone    DMA32, type    Unmovable     10      8     10      9     10      4      3      2      3      0      0
> Node    0, zone    DMA32, type      Movable     18     12     14     16     16     11      9      5      5      6    775
> Node    0, zone    DMA32, type  Reclaimable      0      0      0      0      0      0      0      0      0      0      1
> Node    0, zone    DMA32, type   HighAtomic      0      0      0      0      0      0      0      0      0      0      0
> Node    0, zone    DMA32, type          CMA      0      0      0      0      0      0      0      0      0      0      0
> Node    0, zone    DMA32, type      Isolate      0      0      0      0      0      0      0      0      0      0      0
> Node    0, zone   Normal, type    Unmovable   2669   1236    452    118     37     14      4      1      2      3      0
> Node    0, zone   Normal, type      Movable   3850   6086   5274   4327   3510   2494   1520    934    438    220    470
> Node    0, zone   Normal, type  Reclaimable     56     93    155    124     47     31     17      7      3      0      0
> Node    0, zone   Normal, type   HighAtomic      0      0      0      0      0      0      0      0      0      0      0
> Node    0, zone   Normal, type          CMA      0      0      0      0      0      0      0      0      0      0      0
> Node    0, zone   Normal, type      Isolate      0      0      0      0      0      0      0      0      0      0      0
>
> Number of blocks type     Unmovable      Movable  Reclaimable   HighAtomic          CMA      Isolate
> Node 0, zone      DMA            1            7            0            0            0            0
> Node 0, zone    DMA32            4         1650            2            0            0            0
> Node 0, zone   Normal           79         2326           26            0            0            0
>
> You can see that the number of unmovable page blocks is decreased
> when the kernel has this commit.
>
> Signed-off-by: Hui Zhu <teawaterz@...ux.alibaba.com>

Reviewed-by: Shakeel Butt <shakeelb@...gle.com>

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