linux-kernel - Re: [PATCH] mm: Stop kswapd early when nothing's waiting for it to free pages

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Message-ID: <20200221200605.GA2416@sultan-book.localdomain>
Date:   Fri, 21 Feb 2020 12:06:05 -0800
From:   Sultan Alsawaf <sultan@...neltoast.com>
To:     Shakeel Butt <shakeelb@...gle.com>
Cc:     Mel Gorman <mgorman@...e.de>, Michal Hocko <mhocko@...nel.org>,
        Dave Hansen <dave.hansen@...el.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linux MM <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Johannes Weiner <hannes@...xchg.org>
Subject: Re: [PATCH] mm: Stop kswapd early when nothing's waiting for it to
 free pages

On Fri, Feb 21, 2020 at 10:04:38AM -0800, Shakeel Butt wrote:
> Can you also attach the /proc/zoneinfo? Maybe the watermarks are too high.

Here it is (when booted with mem=2G).

Sultan

Node 0, zone      DMA
  per-node stats
      nr_inactive_anon 236
      nr_active_anon 47914
      nr_inactive_file 44716
      nr_active_file 22397
      nr_unevictable 11665
      nr_slab_reclaimable 11217
      nr_slab_unreclaimable 16465
      nr_isolated_anon 0
      nr_isolated_file 0
      workingset_nodes 0
      workingset_refault 0
      workingset_activate 0
      workingset_restore 0
      workingset_nodereclaim 0
      nr_anon_pages 47716
      nr_mapped    34753
      nr_file_pages 79237
      nr_dirty     66
      nr_writeback 0
      nr_writeback_temp 0
      nr_shmem     12120
      nr_shmem_hugepages 0
      nr_shmem_pmdmapped 0
      nr_file_hugepages 0
      nr_file_pmdmapped 0
      nr_anon_transparent_hugepages 0
      nr_unstable  0
      nr_vmscan_write 0
      nr_vmscan_immediate_reclaim 0
      nr_dirtied   3143
      nr_written   3073
      nr_kernel_misc_reclaimable 0
  pages free     3975
        min      173
        low      216
        high     259
        spanned  4095
        present  3998
        managed  3975
        protection: (0, 992, 992, 992, 992)
      nr_free_pages 3975
      nr_zone_inactive_anon 0
      nr_zone_active_anon 0
      nr_zone_inactive_file 0
      nr_zone_active_file 0
      nr_zone_unevictable 0
      nr_zone_write_pending 0
      nr_mlock     0
      nr_page_table_pages 0
      nr_kernel_stack 0
      nr_bounce    0
      nr_zspages   0
      nr_free_cma  0
      numa_hit     0
      numa_miss    0
      numa_foreign 0
      numa_interleave 0
      numa_local   0
      numa_other   0
  pagesets
    cpu: 0
              count: 0
              high:  0
              batch: 1
  vm stats threshold: 8
    cpu: 1
              count: 0
              high:  0
              batch: 1
  vm stats threshold: 8
    cpu: 2
              count: 0
              high:  0
              batch: 1
  vm stats threshold: 8
    cpu: 3
              count: 0
              high:  0
              batch: 1
  vm stats threshold: 8
    cpu: 4
              count: 0
              high:  0
              batch: 1
  vm stats threshold: 8
    cpu: 5
              count: 0
              high:  0
              batch: 1
  vm stats threshold: 8
    cpu: 6
              count: 0
              high:  0
              batch: 1
  vm stats threshold: 8
    cpu: 7
              count: 0
              high:  0
              batch: 1
  vm stats threshold: 8
  node_unreclaimable:  0
  start_pfn:           1
Node 0, zone    DMA32
  pages free     87925
        min      11090
        low      13862
        high     16634
        spanned  294144
        present  270018
        managed  257874
        protection: (0, 0, 0, 0, 0)
      nr_free_pages 87925
      nr_zone_inactive_anon 236
      nr_zone_active_anon 47914
      nr_zone_inactive_file 44716
      nr_zone_active_file 22397
      nr_zone_unevictable 11665
      nr_zone_write_pending 66
      nr_mlock     16
      nr_page_table_pages 1284
      nr_kernel_stack 5024
      nr_bounce    0
      nr_zspages   0
      nr_free_cma  0
      numa_hit     544686
      numa_miss    0
      numa_foreign 0
      numa_interleave 8149
      numa_local   544686
      numa_other   0
  pagesets
    cpu: 0
              count: 358
              high:  378
              batch: 63
  vm stats threshold: 32
    cpu: 1
              count: 335
              high:  378
              batch: 63
  vm stats threshold: 32
    cpu: 2
              count: 308
              high:  378
              batch: 63
  vm stats threshold: 32
    cpu: 3
              count: 337
              high:  378
              batch: 63
  vm stats threshold: 32
    cpu: 4
              count: 326
              high:  378
              batch: 63
  vm stats threshold: 32
    cpu: 5
              count: 315
              high:  378
              batch: 63
  vm stats threshold: 32
    cpu: 6
              count: 370
              high:  378
              batch: 63
  vm stats threshold: 32
    cpu: 7
              count: 292
              high:  378
              batch: 63
  vm stats threshold: 32
  node_unreclaimable:  0
  start_pfn:           4096
Node 0, zone   Normal
  pages free     0
        min      0
        low      0
        high     0
        spanned  0
        present  0
        managed  0
        protection: (0, 0, 0, 0, 0)
Node 0, zone  Movable
  pages free     0
        min      0
        low      0
        high     0
        spanned  0
        present  0
        managed  0
        protection: (0, 0, 0, 0, 0)
Node 0, zone   Device
  pages free     0
        min      0
        low      0
        high     0
        spanned  0
        present  0
        managed  0
        protection: (0, 0, 0, 0, 0)