The patch titled
Subject: mm: pmd dirty emulation in page fault handler
has been added to the -mm tree. Its filename is
mm-pmd-dirty-emulation-in-page-fault-handler.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-pmd-dirty-emulation-in-page-fault-handler.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-pmd-dirty-emulation-in-page-fault-handler.patch
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------------------------------------------------------
From: Minchan Kim <minchan@xxxxxxxxxx>
Subject: mm: pmd dirty emulation in page fault handler
Andreas reported [1] made a test in jemalloc hang in THP mode in arm64.
http://lkml.kernel.org/r/mvmmvfy37g1.fsf@xxxxxxxxxxxxxxx
The problem is currently page fault handler doesn't supports dirty bit
emulation of pmd for non-HW dirty-bit architecture so that application
stucks until VM marked the pmd dirty.
How the emulation work depends on the architecture. In case of arm64,
when it set up pte firstly, it sets pte PTE_RDONLY to get a chance to mark
the pte dirty via triggering page fault when store access happens. Once
the page fault occurs, VM marks the pmd dirty and arch code for setting
pmd will clear PTE_RDONLY for application to proceed.
IOW, if VM doesn't mark the pmd dirty, application hangs forever by
repeated fault(i.e., store op but the pmd is PTE_RDONLY).
This patch enables pmd dirty-bit emulation for those architectures.
[1] b8d3c4c3009d, mm/huge_memory.c: don't split THP page when MADV_FREE syscall is called
Fixes: b8d3c4c3009d ("mm/huge_memory.c: don't split THP page when MADV_FREE syscall is called")
Link: http://lkml.kernel.org/r/1482506098-6149-1-git-send-email-minchan@xxxxxxxxxx
Signed-off-by: Minchan Kim <minchan@xxxxxxxxxx>
Reported-by: Andreas Schwab <schwab@xxxxxxx>
Tested-by: Andreas Schwab <schwab@xxxxxxx>
Acked-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
Cc: Jason Evans <je@xxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxx>
Cc: Will Deacon <will.deacon@xxxxxxx>
Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx> [4.5+]
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/huge_memory.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff -puN mm/huge_memory.c~mm-pmd-dirty-emulation-in-page-fault-handler mm/huge_memory.c
--- a/mm/huge_memory.c~mm-pmd-dirty-emulation-in-page-fault-handler
+++ a/mm/huge_memory.c
@@ -883,15 +883,17 @@ void huge_pmd_set_accessed(struct vm_fau
{
pmd_t entry;
unsigned long haddr;
+ bool write = vmf->flags & FAULT_FLAG_WRITE;
vmf->ptl = pmd_lock(vmf->vma->vm_mm, vmf->pmd);
if (unlikely(!pmd_same(*vmf->pmd, orig_pmd)))
goto unlock;
entry = pmd_mkyoung(orig_pmd);
+ if (write)
+ entry = pmd_mkdirty(entry);
haddr = vmf->address & HPAGE_PMD_MASK;
- if (pmdp_set_access_flags(vmf->vma, haddr, vmf->pmd, entry,
- vmf->flags & FAULT_FLAG_WRITE))
+ if (pmdp_set_access_flags(vmf->vma, haddr, vmf->pmd, entry, write))
update_mmu_cache_pmd(vmf->vma, vmf->address, vmf->pmd);
unlock:
_
Patches currently in -mm which might be from minchan@xxxxxxxxxx are
mm-pmd-dirty-emulation-in-page-fault-handler.patch
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