diff options
| author | Matthew Wilcox (Oracle) <willy@infradead.org> | 2023-07-24 20:54:03 +0200 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2023-08-18 19:12:51 +0200 |
| commit | 4ec31152a80d83d74d231d964703a721236244ef (patch) | |
| tree | c038eef92d6b55069f2a1bd34c8129fae68278e4 /mm/hugetlb.c | |
| parent | mm: allow per-VMA locks on file-backed VMAs (diff) | |
| download | linux-4ec31152a80d83d74d231d964703a721236244ef.tar.xz linux-4ec31152a80d83d74d231d964703a721236244ef.zip | |
mm: move FAULT_FLAG_VMA_LOCK check from handle_mm_fault()
Handle a little more of the page fault path outside the mmap sem. The
hugetlb path doesn't need to check whether the VMA is anonymous; the
VM_HUGETLB flag is only set on hugetlbfs VMAs. There should be no
performance change from the previous commit; this is simply a step to ease
bisection of any problems.
Link: https://lkml.kernel.org/r/20230724185410.1124082-4-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Suren Baghdasaryan <surenb@google.com>
Cc: Arjun Roy <arjunroy@google.com>
Cc: Eric Dumazet <edumazet@google.com>
Cc: Punit Agrawal <punit.agrawal@bytedance.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm/hugetlb.c')
| -rw-r--r-- | mm/hugetlb.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/mm/hugetlb.c b/mm/hugetlb.c index 5ef7bccda50c..26e87d6cc92f 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -6062,6 +6062,12 @@ vm_fault_t hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma, int need_wait_lock = 0; unsigned long haddr = address & huge_page_mask(h); + /* TODO: Handle faults under the VMA lock */ + if (flags & FAULT_FLAG_VMA_LOCK) { + vma_end_read(vma); + return VM_FAULT_RETRY; + } + /* * Serialize hugepage allocation and instantiation, so that we don't * get spurious allocation failures if two CPUs race to instantiate |