| Message ID | 1597284810-17454-2-git-send-email-chinwen.chang@mediatek.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | Try to release mmap_lock temporarily in smaps_rollup | expand |
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 <chinwen.chang@mediatek.com> Reviewed-by: Steven Price <steven.price@arm.com> > --- > 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 */ >
On Wed, Aug 12, 2020 at 7:14 PM Chinwen Chang <chinwen.chang@mediatek.com> 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 <chinwen.chang@mediatek.com> Acked-by: Michel Lespinasse <walken@google.com>
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 */
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 <chinwen.chang@mediatek.com> --- include/linux/mmap_lock.h | 5 +++++ 1 file changed, 5 insertions(+)