diff options
| author | Andrew Morton <akpm@digeo.com> | 2003-01-10 18:39:36 -0800 |
|---|---|---|
| committer | Richard Henderson <rth@are.twiddle.net> | 2003-01-10 18:39:36 -0800 |
| commit | d9be9136602e3decfd7a0375725a8eba1c5079ec (patch) | |
| tree | d779526ac68a528c5102fcf9188f83ae49b63ef0 /include | |
| parent | b473e48bf88f8a8b4a34c9be9cd9e0e379520cf3 (diff) | |
[PATCH] turn i_shared_lock into a semaphore
i_shared_lock is held for a very long time during vmtruncate() and causes
high scheduling latencies when truncating a file which is mmapped. I've seen
100 milliseconds.
So turn it into a semaphore. It nests inside mmap_sem.
This change is also needed by the shared pagetable patch, which needs to
unshare pte's on the vmtruncate path - lots of pagetable pages need to
be allocated and they are using __GFP_WAIT.
The patch also makes unmap_vma() static.
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/fs.h | 2 | ||||
| -rw-r--r-- | include/linux/mm.h | 1 |
2 files changed, 1 insertions, 2 deletions
diff --git a/include/linux/fs.h b/include/linux/fs.h index 821034d8745b..3d098c717fc1 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -319,7 +319,7 @@ struct address_space { struct address_space_operations *a_ops; /* methods */ struct list_head i_mmap; /* list of private mappings */ struct list_head i_mmap_shared; /* list of private mappings */ - spinlock_t i_shared_lock; /* and spinlock protecting it */ + struct semaphore i_shared_sem; /* and sem protecting it */ unsigned long dirtied_when; /* jiffies of first page dirtying */ int gfp_mask; /* how to allocate the pages */ struct backing_dev_info *backing_dev_info; /* device readahead, etc */ diff --git a/include/linux/mm.h b/include/linux/mm.h index 70177c796b12..554af98ab3b6 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -529,7 +529,6 @@ extern struct vm_area_struct * find_vma_prev(struct mm_struct * mm, unsigned lon struct vm_area_struct **pprev); extern int split_vma(struct mm_struct * mm, struct vm_area_struct * vma, unsigned long addr, int new_below); -extern void unmap_vma(struct mm_struct *mm, struct vm_area_struct *area); /* Look up the first VMA which intersects the interval start_addr..end_addr-1, NULL if none. Assume start_addr < end_addr. */ |