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Anshuman Khandual 73b87bd20a mm/mprotect: add a cond_resched() inside change_pmd_range() 
commit 4991c09c7c812dba13ea9be79a68b4565bb1fa4e upstream.

While testing on a large CPU system, detected the following RCU stall
many times over the span of the workload.  This problem is solved by
adding a cond_resched() in the change_pmd_range() function.

  INFO: rcu_sched detected stalls on CPUs/tasks:
   154-....: (670 ticks this GP) idle=022/140000000000000/0 softirq=2825/2825 fqs=612
   (detected by 955, t=6002 jiffies, g=4486, c=4485, q=90864)
  Sending NMI from CPU 955 to CPUs 154:
  NMI backtrace for cpu 154
  CPU: 154 PID: 147071 Comm: workload Not tainted 4.15.0-rc3+ #3
  NIP:  c0000000000b3f64 LR: c0000000000b33d4 CTR: 000000000000aa18
  REGS: 00000000a4b0fb44 TRAP: 0501   Not tainted  (4.15.0-rc3+)
  MSR:  8000000000009033 <SF,EE,ME,IR,DR,RI,LE>  CR: 22422082  XER: 00000000
  CFAR: 00000000006cf8f0 SOFTE: 1
  GPR00: 0010000000000000 c00003ef9b1cb8c0 c0000000010cc600 0000000000000000
  GPR04: 8e0000018c32b200 40017b3858fd6e00 8e0000018c32b208 40017b3858fd6e00
  GPR08: 8e0000018c32b210 40017b3858fd6e00 8e0000018c32b218 40017b3858fd6e00
  GPR12: ffffffffffffffff c00000000fb25100
  NIP [c0000000000b3f64] plpar_hcall9+0x44/0x7c
  LR [c0000000000b33d4] pSeries_lpar_flush_hash_range+0x384/0x420
  Call Trace:
    flush_hash_range+0x48/0x100
    __flush_tlb_pending+0x44/0xd0
    hpte_need_flush+0x408/0x470
    change_protection_range+0xaac/0xf10
    change_prot_numa+0x30/0xb0
    task_numa_work+0x2d0/0x3e0
    task_work_run+0x130/0x190
    do_notify_resume+0x118/0x120
    ret_from_except_lite+0x70/0x74
  Instruction dump:
  60000000 f8810028 7ca42b78 7cc53378 7ce63b78 7d074378 7d284b78 7d495378
  e9410060 e9610068 e9810070 44000022 <7d806378> e9810028 f88c0000 f8ac0008

Change-Id: Id2a7a0b449991301de8b0871fdcdec6b16c5ec0c
Link: http://lkml.kernel.org/r/20171214140551.5794-1-khandual@linux.vnet.ibm.com
Signed-off-by: Anshuman Khandual <khandual@linux.vnet.ibm.com>
Suggested-by: Nicholas Piggin <npiggin@gmail.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
 		2019-07-27 21:46:25 +02:00
..
kasan kasan, module, vmalloc: rework shadow allocation for modules 2015-05-04 14:03:58 -07:00
Kconfig Import T813XXS2BRC2 kernel source changes 2018-05-26 00:39:42 +02:00
Kconfig.debug
…
Makefile BACKPORT: mm/zpool: implement common zpool api to zbud/zsmalloc 2016-05-18 14:35:03 +05:30
backing-dev.c
…
balloon_compaction.c
…
bootmem.c
…
bounce.c
…
cleancache.c
…
compaction.c Import latest Samsung release 2017-04-18 03:43:52 +02:00
debug-pagealloc.c mm/debug-pagealloc.c: print page physical address for 2015-08-23 23:19:22 -07:00
dmapool.c
…
early_ioremap.c
…
fadvise.c
…
failslab.c
…
filemap.c mm, fs: check for fatal signals in do_generic_file_read() 2019-07-27 21:43:51 +02:00
filemap_xip.c
…
fremap.c
…
frontswap.c mm: frontswap: invalidate expired data on a dup-store failure 2014-12-16 09:09:41 -08:00
highmem.c
…
huge_memory.c mm/huge_memory.c: respect FOLL_FORCE/FOLL_COW for thp 2019-07-27 21:43:25 +02:00
hugetlb.c mm: hugetlbfs: skip shared VMAs when unmapping private pages to satisfy a fault 2015-10-22 14:37:50 -07:00
hugetlb_cgroup.c
…
hwpoison-inject.c
…
init-mm.c
…
internal.h mm: Enhance per process reclaim to consider shared pages 2015-04-16 10:14:27 -07:00
interval_tree.c
…
kmemcheck.c
…
kmemleak-test.c
…
kmemleak.c mm: kmemleak: allow safe memory scanning during kmemleak disabling 2015-06-22 10:47:32 +05:30
ksm.c mm,ksm: fix endless looping in allocating memory when ksm enable 2019-07-27 21:42:51 +02:00
maccess.c
…
madvise.c mm/madvise.c: fix madvise() infinite loop under special circumstances 2019-07-27 21:45:21 +02:00
memblock.c
…
memcontrol.c UPSTREAM: memcg: Only free spare array when readers are done 2016-05-18 14:36:06 +05:30
memory-failure.c This is the 3.10.98 stable release 2017-04-18 17:17:24 +02:00
memory.c mm: thp: fix SMP race condition between THP page fault and MADV_DONTNEED 2019-07-27 21:42:02 +02:00
memory_hotplug.c mm/memory_hotplug.c: check start_pfn in test_pages_in_a_zone() 2019-07-27 21:43:51 +02:00
mempolicy.c mm/mempolicy: fix use after free when calling get_mempolicy 2019-07-27 21:45:02 +02:00
mempool.c
…
memtest.c memtest: use phys_addr_t for physical addresses 2015-04-01 09:27:43 -07:00
migrate.c Sanitize 'move_pages()' permission checks 2019-07-27 21:44:50 +02:00
mincore.c
…
mlock.c mm: reorder can_do_mlock to fix audit denial 2015-09-16 18:20:13 +05:30
mm_init.c
…
mmap.c mm/mmap.c: do not blow on PROT_NONE MAP_FIXED holes in the stack 2019-07-27 21:44:55 +02:00
mmu_context.c
…
mmu_notifier.c
…
mmzone.c
…
mprotect.c mm/mprotect: add a cond_resched() inside change_pmd_range() 2019-07-27 21:46:25 +02:00
mremap.c
…
msync.c
…
nobootmem.c
…
nommu.c This is the 3.10.73 stable release 2015-04-24 18:14:57 -07:00
oom_kill.c This is the 3.10.67 stable release 2015-04-24 18:04:40 -07:00
page-writeback.c Import latest Samsung release 2017-04-18 03:43:52 +02:00
page_alloc.c mm/page_alloc: Remove kernel address exposure in free_reserved_area() 2019-07-27 21:44:12 +02:00
page_cgroup.c
…
page_io.c Import latest Samsung release 2017-04-18 03:43:52 +02:00
page_isolation.c mm/page_alloc: Call kernel_map_pages in unset_migrateype_isolate 2015-03-19 11:34:36 -07:00
pageowner.c
…
pagewalk.c mm: pagewalk: call pte_hole() for VM_PFNMAP during walk_page_range 2015-02-11 14:48:16 +08:00
percpu-km.c
…
percpu-vm.c
…
percpu.c
…
pgtable-generic.c
…
process_reclaim.c lowmemorykiller: Introduce sysfs node for ALMK and PPR adj threshold 2016-07-06 23:07:02 -07:00
process_vm_access.c ptrace: use fsuid, fsgid, effective creds for fs access checks 2016-02-25 11:57:47 -08:00
quicklist.c
…
readahead.c
…
rmap.c mm: Enhance per process reclaim to consider shared pages 2015-04-16 10:14:27 -07:00
shmem.c tmpfs: fix regression hang in fallocate undo 2019-07-27 21:41:47 +02:00
showmem.c Import latest Samsung release 2017-04-18 03:43:52 +02:00
slab.c cpuset: PF_SPREAD_PAGE and PF_SPREAD_SLAB should be atomic flags 2019-07-27 21:44:59 +02:00
slab.h
…
slab_common.c mm: slub: add kernel address sanitizer support for slub allocator 2015-05-04 14:03:56 -07:00
slob.c
…
slub.c mm: slub: add kernel address sanitizer support for slub allocator 2015-05-04 14:03:56 -07:00
sparse-vmemmap.c
…
sparse.c
…
swap.c
…
swap_state.c Import latest Samsung release 2017-04-18 03:43:52 +02:00
swapfile.c swapfile: fix memory corruption via malformed swapfile 2019-07-27 21:42:14 +02:00
truncate.c
…
util.c Import latest Samsung release 2017-04-18 03:43:52 +02:00
vmalloc.c Import latest Samsung release 2017-04-18 03:43:52 +02:00
vmpressure.c mm: vmpressure: fix sending wrong events on underflow 2019-07-27 21:43:56 +02:00
vmscan.c Import latest Samsung release 2017-04-18 03:43:52 +02:00
vmstat.c Import latest Samsung release 2017-04-18 03:43:52 +02:00
zbud.c Import latest Samsung release 2017-04-18 03:43:52 +02:00
zpool.c Import latest Samsung release 2017-04-18 03:43:52 +02:00
zsmalloc.c Import latest Samsung release 2017-04-18 03:43:52 +02:00
zswap.c Import latest Samsung release 2017-04-18 03:43:52 +02:00