1. 14 Jun, 2018 2 commits
  2. 08 Jun, 2018 2 commits
  3. 06 Apr, 2018 5 commits
  4. 30 Mar, 2018 1 commit
  5. 23 Mar, 2018 1 commit
    • Daniel Vacek's avatar
      Revert "mm: page_alloc: skip over regions of invalid pfns where possible" · f59f1caf
      Daniel Vacek authored
      This reverts commit b92df1de ("mm: page_alloc: skip over regions of
      invalid pfns where possible").  The commit is meant to be a boot init
      speed up skipping the loop in memmap_init_zone() for invalid pfns.
      
      But given some specific memory mapping on x86_64 (or more generally
      theoretically anywhere but on arm with CONFIG_HAVE_ARCH_PFN_VALID) the
      implementation also skips valid pfns which is plain wrong and causes
      'kernel BUG at mm/page_alloc.c:1389!'
      
        crash> log | grep -e BUG -e RIP -e Call.Trace -e move_freepages_block -e rmqueue -e freelist -A1
        kernel BUG at mm/page_alloc.c:1389!
        invalid opcode: 0000 [#1] SMP
        --
        RIP: 0010: move_freepages+0x15e/0x160
        --
        Call Trace:
          move_freepages_block+0x73/0x80
          __rmqueue+0x263/0x460
          get_page_from_freelist+0x7e1/0x9e0
          __alloc_pages_nodemask+0x176/0x420
        --
      
        crash> page_init_bug -v | grep RAM
        <struct resource 0xffff88067fffd2f8>          1000 -        9bfff       System RAM (620.00 KiB)
        <struct resource 0xffff88067fffd3a0>        100000 -     430bffff       System RAM (  1.05 GiB = 1071.75 MiB = 1097472.00 KiB)
        <struct resource 0xffff88067fffd410>      4b0c8000 -     4bf9cfff       System RAM ( 14.83 MiB = 15188.00 KiB)
        <struct resource 0xffff88067fffd480>      4bfac000 -     646b1fff       System RAM (391.02 MiB = 400408.00 KiB)
        <struct resource 0xffff88067fffd560>      7b788000 -     7b7fffff       System RAM (480.00 KiB)
        <struct resource 0xffff88067fffd640>     100000000 -    67fffffff       System RAM ( 22.00 GiB)
      
        crash> page_init_bug | head -6
        <struct resource 0xffff88067fffd560>      7b788000 -     7b7fffff       System RAM (480.00 KiB)
        <struct page 0xffffea0001ede200>   1fffff00000000  0 <struct pglist_data 0xffff88047ffd9000> 1 <struct zone 0xffff88047ffd9800> DMA32          4096    1048575
        <struct page 0xffffea0001ede200>       505736 505344 <struct page 0xffffea0001ed8000> 505855 <struct page 0xffffea0001edffc0>
        <struct page 0xffffea0001ed8000>                0  0 <struct pglist_data 0xffff88047ffd9000> 0 <struct zone 0xffff88047ffd9000> DMA               1       4095
        <struct page 0xffffea0001edffc0>   1fffff00000400  0 <struct pglist_data 0xffff88047ffd9000> 1 <struct zone 0xffff88047ffd9800> DMA32          4096    1048575
        BUG, zones differ!
      
        crash> kmem -p 77fff000 78000000 7b5ff000 7b600000 7b787000 7b788000
              PAGE        PHYSICAL      MAPPING       INDEX CNT FLAGS
        ffffea0001e00000  78000000                0        0  0 0
        ffffea0001ed7fc0  7b5ff000                0        0  0 0
        ffffea0001ed8000  7b600000                0        0  0 0       <<<<
        ffffea0001ede1c0  7b787000                0        0  0 0
        ffffea0001ede200  7b788000                0        0  1 1fffff00000000
      
      Link: http://lkml.kernel.org/r/20180316143855.29838-1-neelx@redhat.com
      Fixes: b92df1de
      
       ("mm: page_alloc: skip over regions of invalid pfns where possible")
      Signed-off-by: default avatarDaniel Vacek <neelx@redhat.com>
      Acked-by: default avatarArd Biesheuvel <ard.biesheuvel@linaro.org>
      Acked-by: default avatarMichal Hocko <mhocko@suse.com>
      Reviewed-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Cc: Vlastimil Babka <vbabka@suse.cz>
      Cc: Mel Gorman <mgorman@techsingularity.net>
      Cc: Pavel Tatashin <pasha.tatashin@oracle.com>
      Cc: Paul Burton <paul.burton@imgtec.com>
      Cc: <stable@vger.kernel.org>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      f59f1caf
  6. 10 Mar, 2018 1 commit
  7. 07 Feb, 2018 1 commit
  8. 16 Nov, 2017 2 commits
  9. 25 Aug, 2017 1 commit
  10. 18 Aug, 2017 1 commit
  11. 06 Jul, 2017 2 commits
  12. 02 Jun, 2017 1 commit
    • Michal Hocko's avatar
      mm: consider memblock reservations for deferred memory initialization sizing · 864b9a39
      Michal Hocko authored
      We have seen an early OOM killer invocation on ppc64 systems with
      crashkernel=4096M:
      
      	kthreadd invoked oom-killer: gfp_mask=0x16040c0(GFP_KERNEL|__GFP_COMP|__GFP_NOTRACK), nodemask=7, order=0, oom_score_adj=0
      	kthreadd cpuset=/ mems_allowed=7
      	CPU: 0 PID: 2 Comm: kthreadd Not tainted 4.4.68-1.gd7fe927-default #1
      	Call Trace:
      	  dump_stack+0xb0/0xf0 (unreliable)
      	  dump_header+0xb0/0x258
      	  out_of_memory+0x5f0/0x640
      	  __alloc_pages_nodemask+0xa8c/0xc80
      	  kmem_getpages+0x84/0x1a0
      	  fallback_alloc+0x2a4/0x320
      	  kmem_cache_alloc_node+0xc0/0x2e0
      	  copy_process.isra.25+0x260/0x1b30
      	  _do_fork+0x94/0x470
      	  kernel_thread+0x48/0x60
      	  kthreadd+0x264/0x330
      	  ret_from_kernel_thread+0x5c/0xa4
      
      	Mem-Info:
      	active_anon:0 inactive_anon:0 isolated_anon:0
      	 active_file:0 inactive_file:0 isolated_file:0
      	 unevictable:0 dirty:0 writeback:0 unstable:0
      	 slab_reclaimable:5 slab_unreclaimable:73
      	 mapped:0 shmem:0 pagetables:0 bounce:0
      	 free:0 free_pcp:0 free_cma:0
      	Node 7 DMA free:0kB min:0kB low:0kB high:0kB active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:52428800kB managed:110016kB mlocked:0kB dirty:0kB writeback:0kB mapped:0kB shmem:0kB slab_reclaimable:320kB slab_unreclaimable:4672kB kernel_stack:1152kB pagetables:0kB unstable:0kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? yes
      	lowmem_reserve[]: 0 0 0 0
      	Node 7 DMA: 0*64kB 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB 0*8192kB 0*16384kB = 0kB
      	0 total pagecache pages
      	0 pages in swap cache
      	Swap cache stats: add 0, delete 0, find 0/0
      	Free swap  = 0kB
      	Total swap = 0kB
      	819200 pages RAM
      	0 pages HighMem/MovableOnly
      	817481 pages reserved
      	0 pages cma reserved
      	0 pages hwpoisoned
      
      the reason is that the managed memory is too low (only 110MB) while the
      rest of the the 50GB is still waiting for the deferred intialization to
      be done.  update_defer_init estimates the initial memoty to initialize
      to 2GB at least but it doesn't consider any memory allocated in that
      range.  In this particular case we've had
      
      	Reserving 4096MB of memory at 128MB for crashkernel (System RAM: 51200MB)
      
      so the low 2GB is mostly depleted.
      
      Fix this by considering memblock allocations in the initial static
      initialization estimation.  Move the max_initialise to
      reset_deferred_meminit and implement a simple memblock_reserved_memory
      helper which iterates all reserved blocks and sums the size of all that
      start below the given address.  The cumulative size is than added on top
      of the initial estimation.  This is still not ideal because
      reset_deferred_meminit doesn't consider holes and so reservation might
      be above the initial estimation whihch we ignore but let's make the
      logic simpler until we really need to handle more complicated cases.
      
      Fixes: 3a80a7fa ("mm: meminit: initialise a subset of struct pages if CONFIG_DEFERRED_STRUCT_PAGE_INIT is set")
      Link: http://lkml.kernel.org/r/20170531104010.GI27783@dhcp22.suse.cz
      
      Signed-off-by: default avatarMichal Hocko <mhocko@suse.com>
      Acked-by: default avatarMel Gorman <mgorman@suse.de>
      Tested-by: default avatarSrikar Dronamraju <srikar@linux.vnet.ibm.com>
      Cc: <stable@vger.kernel.org>	[4.2+]
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      864b9a39
  13. 05 Apr, 2017 2 commits
  14. 10 Mar, 2017 1 commit
  15. 25 Feb, 2017 3 commits
  16. 23 Feb, 2017 4 commits
  17. 11 Oct, 2016 1 commit
  18. 08 Oct, 2016 1 commit
  19. 05 Aug, 2016 2 commits
  20. 28 Jul, 2016 3 commits
  21. 26 Jul, 2016 1 commit
  22. 21 May, 2016 2 commits