Re: [PATCH v2 1/2] mmap locking API: add mmap_lock_is_contended()
From: Steven Price <steven.price@arm.com>
Date: 2020-08-13 08:21:38
Also in:
linux-fsdevel, linux-mediatek, lkml
On 13/08/2020 03:13, Chinwen Chang wrote:
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>
Reviewed-by: Steven Price <steven.price@arm.com>
quoted hunk ↗ jump to hunk
--- 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 */
_______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel