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Date:   Wed, 5 Jun 2019 10:33:05 +0800
From:   Hui Zhu <teawater@...il.com>
To:     Shakeel Butt <shakeelb@...gle.com>
Cc:     Hui Zhu <teawaterz@...ux.alibaba.com>,
        Dan Streetman <ddstreet@...e.org>,
        Minchan Kim <minchan@...nel.org>,
        "ngupta@...are.org" <ngupta@...are.org>,
        Sergey Senozhatsky <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 V2 2/2] zswap: Add module parameter malloc_movable_if_support

Shakeel Butt <shakeelb@...gle.com> 于2019年6月5日周三 上午1:12写道:
>
> On Sun, Jun 2, 2019 at 2:47 AM Hui Zhu <teawaterz@...ux.alibaba.com> wrote:
> >
> > This is the second version that was updated according to the comments
> > from Sergey Senozhatsky in https://lkml.org/lkml/2019/5/29/73
> >
> > 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 adds module parameter malloc_movable_if_support to enable
> > or disable zpool allocate block with gfp __GFP_HIGHMEM | __GFP_MOVABLE
> > if it support allocate movable memory (disabled by default).
> >
> > Following part is test log in a pc that has 8G memory and 2G swap.
> >
> > When it disabled:
> >  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 / 3977932 usecs = 667233 KB/s
> > 2717908992 bytes / 4160702 usecs = 637923 KB/s
> > 2717908992 bytes / 4354611 usecs = 609516 KB/s
> > 293359 usecs to free memory
> > 340304 usecs to free memory
> > 205781 usecs to free memory
> > 2717908992 bytes / 5588016 usecs = 474982 KB/s
> > 166124 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      5     10      9      8      8      5      1      2      3      0      0
> > Node    0, zone    DMA32, type      Movable     15     16     14     12     14     10      9      6      6      5    776
> > 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   7097   6914   6473   5642   4373   2664   1220    319     78      4      0
> > Node    0, zone   Normal, type      Movable   2092   3216   2820   2266   1585    946    559    359    237    258    378
> > Node    0, zone   Normal, type  Reclaimable     47     88    122     80     34      9      5      4      2      1      2
> > 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          834         1572           25            0            0            0
> >
> > When it enabled:
> >  echo lz4 > /sys/module/zswap/parameters/compressor
> >  echo zsmalloc > /sys/module/zswap/parameters/zpool
> >  echo 1 > /sys/module/zswap/parameters/enabled
> >  echo 1 > /sys/module/zswap/parameters/malloc_movable_if_support
> >  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 / 4721401 usecs = 562165 KB/s
> > 2717908992 bytes / 4783167 usecs = 554905 KB/s
> > 2717908992 bytes / 4802125 usecs = 552715 KB/s
> > 2717908992 bytes / 4866579 usecs = 545395 KB/s
> > 323605 usecs to free memory
> > 414817 usecs to free memory
> > 458576 usecs to free memory
> > 355827 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      8     10      8      7      7      6      5      3      2      0      0
> > Node    0, zone    DMA32, type      Movable     23     21     18     15     13     14     14     10     11      6    766
> > 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   2660   1295    460    102     11      5      3     11      2      4      0
> > Node    0, zone   Normal, type      Movable   4178   5760   5045   4137   3324   2306   1482    930    497    254    460
> > Node    0, zone   Normal, type  Reclaimable     50     83    114     93     28     12     10      6      3      3      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           81         2325           25            0            0            0
> >
> > You can see that the number of unmovable page blocks is decreased
> > when malloc_movable_if_support is enabled.
> >
> > Signed-off-by: Hui Zhu <teawaterz@...ux.alibaba.com>
> > ---
> >  mm/zswap.c | 16 +++++++++++++---
> >  1 file changed, 13 insertions(+), 3 deletions(-)
> >
> > diff --git a/mm/zswap.c b/mm/zswap.c
> > index a4e4d36ec085..2fc45de92383 100644
> > --- a/mm/zswap.c
> > +++ b/mm/zswap.c
> > @@ -123,6 +123,13 @@ static bool zswap_same_filled_pages_enabled = true;
> >  module_param_named(same_filled_pages_enabled, zswap_same_filled_pages_enabled,
> >                    bool, 0644);
> >
> > +/* Enable/disable zpool allocate block with gfp __GFP_HIGHMEM | __GFP_MOVABLE
> > + * if it support allocate movable memory (disabled by default).
> > + */
> > +static bool __read_mostly zswap_malloc_movable_if_support;
> > +module_param_cb(malloc_movable_if_support, &param_ops_bool,
> > +               &zswap_malloc_movable_if_support, 0644);
> > +
>
> Any reason for the above tunable? Do we ever want to disable movable
> for zswap+zsmalloc?

Thanks for your remind.  I will post a new version that remove this
module_param later.

Best,
Hui

>
> >  /*********************************
> >  * data structures
> >  **********************************/
> > @@ -1006,6 +1013,7 @@ static int zswap_frontswap_store(unsigned type, pgoff_t offset,
> >         char *buf;
> >         u8 *src, *dst;
> >         struct zswap_header zhdr = { .swpentry = swp_entry(type, offset) };
> > +       gfp_t gfp = __GFP_NORETRY | __GFP_NOWARN | __GFP_KSWAPD_RECLAIM;
> >
> >         /* THP isn't supported */
> >         if (PageTransHuge(page)) {
> > @@ -1079,9 +1087,11 @@ static int zswap_frontswap_store(unsigned type, pgoff_t offset,
> >
> >         /* store */
> >         hlen = zpool_evictable(entry->pool->zpool) ? sizeof(zhdr) : 0;
> > -       ret = zpool_malloc(entry->pool->zpool, hlen + dlen,
> > -                          __GFP_NORETRY | __GFP_NOWARN | __GFP_KSWAPD_RECLAIM,
> > -                          &handle);
> > +       if (zswap_malloc_movable_if_support &&
> > +               zpool_malloc_support_movable(entry->pool->zpool)) {
> > +               gfp |= __GFP_HIGHMEM | __GFP_MOVABLE;
> > +       }
> > +       ret = zpool_malloc(entry->pool->zpool, hlen + dlen, gfp, &handle);
> >         if (ret == -ENOSPC) {
> >                 zswap_reject_compress_poor++;
> >                 goto put_dstmem;
> > --
> > 2.20.1 (Apple Git-117)
> >
>

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