| commit | 3be51060599ff01899b6d8c3f8aca456506cf5ea | [log] [tgz] |
|---|---|---|
| author | Matthew Wilcox (Oracle) <willy@infradead.org> | Fri Apr 26 15:45:00 2024 +0100 |
| committer | Andrew Morton <akpm@linux-foundation.org> | Sun May 05 17:53:53 2024 -0700 |
| tree | 0a684360bd4979d6554b317575e1e4d3827fbed4 | |
| parent | e0ffb29bc54d86b9ab10ebafc66eb1b7229e0cd7 [diff] |
mm: assert the mmap_lock is held in __anon_vma_prepare() Patch series "Improve anon_vma scalability for anon VMAs". We have a 3x throughput improvement reported by Intel's kernel test robot: https://lore.kernel.org/all/202404261055.c5e24608-oliver.sang@intel.com/ This is from delaying taking the mmap_lock for page faults until we actually need the mmap_lock in order to assign an anon_vma to the vma. It cleans up the page fault path a little by making the anon fault handler more similar to the file fault handler. This patch (of 4): Convert the comment into an assertion. Link: https://lkml.kernel.org/r/20240426144506.1290619-1-willy@infradead.org Link: https://lkml.kernel.org/r/20240426144506.1290619-2-willy@infradead.org Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> Reviewed-by: Suren Baghdasaryan <surenb@google.com> Reviewed-by: David Hildenbrand <david@redhat.com> Cc: Jann Horn <jannh@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>