[PATCH 1/2] mmap locking API: add mmap_lock_is_contended()
From: Chinwen Chang <hidden>
Date: 2020-08-11 04:45:03
Also in:
linux-fsdevel, linux-mediatek, lkml
Subsystem:
memory mapping - locking, the rest · Maintainers:
Andrew Morton, Suren Baghdasaryan, Liam R. Howlett, Lorenzo Stoakes, Linus Torvalds
Add new API to query if someone wants to acquire mmap_lock for write attempts. Using this instead of rwsem_is_contended makes it more tolerant of future changes to the lock type. Signed-off-by: Chinwen Chang <redacted> --- include/linux/mmap_lock.h | 5 +++++ 1 file changed, 5 insertions(+)
diff --git a/include/linux/mmap_lock.h b/include/linux/mmap_lock.h
index 0707671..18e7eae 100644
--- a/include/linux/mmap_lock.h
+++ b/include/linux/mmap_lock.h@@ -87,4 +87,9 @@ static inline void mmap_assert_write_locked(struct mm_struct *mm) VM_BUG_ON_MM(!rwsem_is_locked(&mm->mmap_lock), mm); } +static inline int mmap_lock_is_contended(struct mm_struct *mm) +{ + return rwsem_is_contended(&mm->mmap_lock); +} + #endif /* _LINUX_MMAP_LOCK_H */
--
1.9.1
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel