• Jaewon Kim's avatar
    page_alloc: consider highatomic reserve in watermark fast · f27ce0e1
    Jaewon Kim authored
    zone_watermark_fast was introduced by commit 48ee5f36 ("mm,
    page_alloc: shortcut watermark checks for order-0 pages").  The commit
    simply checks if free pages is bigger than watermark without additional
    calculation such like reducing watermark.
    
    It considered free cma pages but it did not consider highatomic reserved.
    This may incur exhaustion of free pages except high order atomic free
    pages.
    
    Assume that reserved_highatomic pageblock is bigger than watermark min,
    and there are only few free pages except high order atomic free.  Because
    zone_watermark_fast passes the allocation without considering high order
    atomic free, normal reclaimable allocation like GFP_HIGHUSER will consume
    all the free pages.  Then finally order-0 atomic allocation may fail on
    allocation.
    
    This means watermark min is not protected against non-atomic allocation.
    The order-0 atomic allocation with ALLOC_HARDER unwantedly can be failed.
    Additionally the __GFP_MEMALLOC allocation with ALLOC_NO_WATERMARKS also
    can be failed.
    
    To avoid the problem, zone_watermark_fast should consider highatomic
    reserve.  If the actual size of high atomic free is counted accurately
    like cma free, we may use it.  On this patch just use
    nr_reserved_highatomic.  Additionally introduce
    __zone_watermark_unusable_free to factor out common parts between
    zone_watermark_fast and __zone_watermark_ok.
    
    This is an example of ALLOC_HARDER allocation failure using v4.19 based
    kernel.
    
     Binder:9343_3: page allocation failure: order:0, mode:0x480020(GFP_ATOMIC), nodemask=(null)
     Call trace:
     [<ffffff8008f40f8c>] dump_stack+0xb8/0xf0
     [<ffffff8008223320>] warn_alloc+0xd8/0x12c
     [<ffffff80082245e4>] __alloc_pages_nodemask+0x120c/0x1250
     [<ffffff800827f6e8>] new_slab+0x128/0x604
     [<ffffff800827b0cc>] ___slab_alloc+0x508/0x670
     [<ffffff800827ba00>] __kmalloc+0x2f8/0x310
     [<ffffff80084ac3e0>] context_struct_to_string+0x104/0x1cc
     [<ffffff80084ad8fc>] security_sid_to_context_core+0x74/0x144
     [<ffffff80084ad880>] security_sid_to_context+0x10/0x18
     [<ffffff800849bd80>] selinux_secid_to_secctx+0x20/0x28
     [<ffffff800849109c>] security_secid_to_secctx+0x3c/0x70
     [<ffffff8008bfe118>] binder_transaction+0xe68/0x454c
     Mem-Info:
     active_anon:102061 inactive_anon:81551 isolated_anon:0
      active_file:59102 inactive_file:68924 isolated_file:64
      unevictable:611 dirty:63 writeback:0 unstable:0
      slab_reclaimable:13324 slab_unreclaimable:44354
      mapped:83015 shmem:4858 pagetables:26316 bounce:0
      free:2727 free_pcp:1035 free_cma:178
     Node 0 active_anon:408244kB inactive_anon:326204kB active_file:236408kB inactive_file:275696kB unevictable:2444kB isolated(anon):0kB isolated(file):256kB mapped:332060kB dirty:252kB writeback:0kB shmem:19432kB writeback_tmp:0kB unstable:0kB all_unreclaimable? no
     Normal free:10908kB min:6192kB low:44388kB high:47060kB active_anon:409160kB inactive_anon:325924kB active_file:235820kB inactive_file:276628kB unevictable:2444kB writepending:252kB present:3076096kB managed:2673676kB mlocked:2444kB kernel_stack:62512kB pagetables:105264kB bounce:0kB free_pcp:4140kB local_pcp:40kB free_cma:712kB
     lowmem_reserve[]: 0 0
     Normal: 505*4kB (H) 357*8kB (H) 201*16kB (H) 65*32kB (H) 1*64kB (H) 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 10236kB
     138826 total pagecache pages
     5460 pages in swap cache
     Swap cache stats: add 8273090, delete 8267506, find 1004381/4060142
    
    This is an example of ALLOC_NO_WATERMARKS allocation failure using v4.14
    based kernel.
    
     kswapd0: page allocation failure: order:0, mode:0x140000a(GFP_NOIO|__GFP_HIGHMEM|__GFP_MOVABLE), nodemask=(null)
     kswapd0 cpuset=/ mems_allowed=0
     CPU: 4 PID: 1221 Comm: kswapd0 Not tainted 4.14.113-18770262-userdebug #1
     Call trace:
     [<0000000000000000>] dump_backtrace+0x0/0x248
     [<0000000000000000>] show_stack+0x18/0x20
     [<0000000000000000>] __dump_stack+0x20/0x28
     [<0000000000000000>] dump_stack+0x68/0x90
     [<0000000000000000>] warn_alloc+0x104/0x198
     [<0000000000000000>] __alloc_pages_nodemask+0xdc0/0xdf0
     [<0000000000000000>] zs_malloc+0x148/0x3d0
     [<0000000000000000>] zram_bvec_rw+0x410/0x798
     [<0000000000000000>] zram_rw_page+0x88/0xdc
     [<0000000000000000>] bdev_write_page+0x70/0xbc
     [<0000000000000000>] __swap_writepage+0x58/0x37c
     [<0000000000000000>] swap_writepage+0x40/0x4c
     [<0000000000000000>] shrink_page_list+0xc30/0xf48
     [<0000000000000000>] shrink_inactive_list+0x2b0/0x61c
     [<0000000000000000>] shrink_node_memcg+0x23c/0x618
     [<0000000000000000>] shrink_node+0x1c8/0x304
     [<0000000000000000>] kswapd+0x680/0x7c4
     [<0000000000000000>] kthread+0x110/0x120
     [<0000000000000000>] ret_from_fork+0x10/0x18
     Mem-Info:
     active_anon:111826 inactive_anon:65557 isolated_anon:0\x0a active_file:44260 inactive_file:83422 isolated_file:0\x0a unevictable:4158 dirty:117 writeback:0 unstable:0\x0a            slab_reclaimable:13943 slab_unreclaimable:43315\x0a mapped:102511 shmem:3299 pagetables:19566 bounce:0\x0a free:3510 free_pcp:553 free_cma:0
     Node 0 active_anon:447304kB inactive_anon:262228kB active_file:177040kB inactive_file:333688kB unevictable:16632kB isolated(anon):0kB isolated(file):0kB mapped:410044kB d irty:468kB writeback:0kB shmem:13196kB writeback_tmp:0kB unstable:0kB all_unreclaimable? no
     Normal free:14040kB min:7440kB low:94500kB high:98136kB reserved_highatomic:32768KB active_anon:447336kB inactive_anon:261668kB active_file:177572kB inactive_file:333768k           B unevictable:16632kB writepending:480kB present:4081664kB managed:3637088kB mlocked:16632kB kernel_stack:47072kB pagetables:78264kB bounce:0kB free_pcp:2280kB local_pcp:720kB free_cma:0kB        [ 4738.329607] lowmem_reserve[]: 0 0
     Normal: 860*4kB (H) 453*8kB (H) 180*16kB (H) 26*32kB (H) 34*64kB (H) 6*128kB (H) 2*256kB (H) 0*512kB 0*1024kB 0*2048kB 0*4096kB = 14232kB
    
    This is trace log which shows GFP_HIGHUSER consumes free pages right
    before ALLOC_NO_WATERMARKS.
    
      <...>-22275 [006] ....   889.213383: mm_page_alloc: page=00000000d2be5665 pfn=970744 order=0 migratetype=0 nr_free=3650 gfp_flags=GFP_HIGHUSER|__GFP_ZERO
      <...>-22275 [006] ....   889.213385: mm_page_alloc: page=000000004b2335c2 pfn=970745 order=0 migratetype=0 nr_free=3650 gfp_flags=GFP_HIGHUSER|__GFP_ZERO
      <...>-22275 [006] ....   889.213387: mm_page_alloc: page=00000000017272e1 pfn=970278 order=0 migratetype=0 nr_free=3650 gfp_flags=GFP_HIGHUSER|__GFP_ZERO
      <...>-22275 [006] ....   889.213389: mm_page_alloc: page=00000000c4be79fb pfn=970279 order=0 migratetype=0 nr_free=3650 gfp_flags=GFP_HIGHUSER|__GFP_ZERO
      <...>-22275 [006] ....   889.213391: mm_page_alloc: page=00000000f8a51d4f pfn=970260 order=0 migratetype=0 nr_free=3650 gfp_flags=GFP_HIGHUSER|__GFP_ZERO
      <...>-22275 [006] ....   889.213393: mm_page_alloc: page=000000006ba8f5ac pfn=970261 order=0 migratetype=0 nr_free=3650 gfp_flags=GFP_HIGHUSER|__GFP_ZERO
      <...>-22275 [006] ....   889.213395: mm_page_alloc: page=00000000819f1cd3 pfn=970196 order=0 migratetype=0 nr_free=3650 gfp_flags=GFP_HIGHUSER|__GFP_ZERO
      <...>-22275 [006] ....   889.213396: mm_page_alloc: page=00000000f6b72a64 pfn=970197 order=0 migratetype=0 nr_free=3650 gfp_flags=GFP_HIGHUSER|__GFP_ZERO
    kswapd0-1207  [005] ...1   889.213398: mm_page_alloc: page= (null) pfn=0 order=0 migratetype=1 nr_free=3650 gfp_flags=GFP_NOWAIT|__GFP_HIGHMEM|__GFP_NOWARN|__GFP_MOVABLE
    
    [jaewon31.kim@samsung.com: remove redundant code for high-order]
      Link: http://lkml.kernel.org/r/20200623035242.27232-1-jaewon31.kim@samsung.comReported-by: default avatarYong-Taek Lee <ytk.lee@samsung.com>
    Suggested-by: default avatarMinchan Kim <minchan@kernel.org>
    Signed-off-by: default avatarJaewon Kim <jaewon31.kim@samsung.com>
    Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
    Reviewed-by: default avatarBaoquan He <bhe@redhat.com>
    Acked-by: default avatarVlastimil Babka <vbabka@suse.cz>
    Acked-by: default avatarMel Gorman <mgorman@techsingularity.net>
    Cc: Johannes Weiner <hannes@cmpxchg.org>
    Cc: Yong-Taek Lee <ytk.lee@samsung.com>
    Cc: Michal Hocko <mhocko@kernel.org>
    Link: http://lkml.kernel.org/r/20200619235958.11283-1-jaewon31.kim@samsung.comSigned-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
    f27ce0e1
page_alloc.c 242 KB