diff options
| author | Baolin Wang <baolin.wang@linux.alibaba.com> | 2024-09-22 12:32:13 +0800 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2024-11-05 16:56:20 -0800 |
| commit | d2d243df445a88c26e91eac02b041213c7a32e9e (patch) | |
| tree | f5a8c7b4f8c267422714fb2a3f05637405de5830 /include/linux/shmem_fs.h | |
| parent | f8f55e9ec73f0a07e55fd91ce82fdca0796ad66a (diff) | |
mm: shmem: fix khugepaged activation policy for shmem
Shmem has a separate interface (different from anonymous pages) to control
huge page allocation, that means shmem THP can be enabled while anonymous
THP is disabled. However, in this case, khugepaged will not start to
collapse shmem THP, which is unreasonable.
To fix this issue, we should call start_stop_khugepaged() to activate or
deactivate the khugepaged thread when setting shmem mTHP interfaces.
Moreover, add a new helper shmem_hpage_pmd_enabled() to help to check
whether shmem THP is enabled, which will determine if khugepaged should be
activated.
Link: https://lkml.kernel.org/r/9b9c6cbc4499bf44c6455367fd9e0f6036525680.1726978977.git.baolin.wang@linux.alibaba.com
Signed-off-by: Baolin Wang <baolin.wang@linux.alibaba.com>
Reported-by: Ryan Roberts <ryan.roberts@arm.com>
Reviewed-by: Ryan Roberts <ryan.roberts@arm.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Matthew Wilcox <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'include/linux/shmem_fs.h')
| -rw-r--r-- | include/linux/shmem_fs.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/include/linux/shmem_fs.h b/include/linux/shmem_fs.h index 515a9a6a3c6f..ee6635052383 100644 --- a/include/linux/shmem_fs.h +++ b/include/linux/shmem_fs.h @@ -114,6 +114,7 @@ int shmem_unuse(unsigned int type); unsigned long shmem_allowable_huge_orders(struct inode *inode, struct vm_area_struct *vma, pgoff_t index, loff_t write_end, bool shmem_huge_force); +bool shmem_hpage_pmd_enabled(void); #else static inline unsigned long shmem_allowable_huge_orders(struct inode *inode, struct vm_area_struct *vma, pgoff_t index, @@ -121,6 +122,11 @@ static inline unsigned long shmem_allowable_huge_orders(struct inode *inode, { return 0; } + +static inline bool shmem_hpage_pmd_enabled(void) +{ + return false; +} #endif #ifdef CONFIG_SHMEM |