[PATCH 09/14] mm: change tree_lock into a spinlock
From: Peter Zijlstra
Date: Sun Jan 28 2007 - 08:32:57 EST
with all the read_lock uses of the tree_lock gone, change it into
a spinlock.
Signed-off-by: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
---
fs/buffer.c | 4 ++--
fs/inode.c | 2 +-
include/asm-arm/cacheflush.h | 4 ++--
include/asm-parisc/cacheflush.h | 4 ++--
include/linux/fs.h | 2 +-
mm/filemap.c | 8 ++++----
mm/migrate.c | 6 +++---
mm/page-writeback.c | 12 ++++++------
mm/swap_state.c | 10 +++++-----
mm/swapfile.c | 4 ++--
mm/truncate.c | 6 +++---
mm/vmscan.c | 8 ++++----
12 files changed, 35 insertions(+), 35 deletions(-)
Index: linux-2.6/fs/buffer.c
===================================================================
--- linux-2.6.orig/fs/buffer.c 2007-01-28 13:59:07.000000000 +0100
+++ linux-2.6/fs/buffer.c 2007-01-28 13:59:24.000000000 +0100
@@ -728,7 +728,7 @@ int __set_page_dirty_buffers(struct page
if (TestSetPageDirty(page))
return 0;
- write_lock_irq(&mapping->tree_lock);
+ spin_lock_irq(&mapping->tree_lock);
if (page->mapping) { /* Race with truncate? */
if (mapping_cap_account_dirty(mapping)) {
__inc_zone_page_state(page, NR_FILE_DIRTY);
@@ -737,7 +737,7 @@ int __set_page_dirty_buffers(struct page
radix_tree_tag_set(&mapping->page_tree,
page_index(page), PAGECACHE_TAG_DIRTY);
}
- write_unlock_irq(&mapping->tree_lock);
+ spin_unlock_irq(&mapping->tree_lock);
__mark_inode_dirty(mapping->host, I_DIRTY_PAGES);
return 1;
}
Index: linux-2.6/include/asm-arm/cacheflush.h
===================================================================
--- linux-2.6.orig/include/asm-arm/cacheflush.h 2007-01-28 13:59:07.000000000 +0100
+++ linux-2.6/include/asm-arm/cacheflush.h 2007-01-28 13:59:24.000000000 +0100
@@ -368,9 +368,9 @@ static inline void flush_anon_page(struc
}
#define flush_dcache_mmap_lock(mapping) \
- write_lock_irq(&(mapping)->tree_lock)
+ spin_lock_irq(&(mapping)->tree_lock)
#define flush_dcache_mmap_unlock(mapping) \
- write_unlock_irq(&(mapping)->tree_lock)
+ spin_unlock_irq(&(mapping)->tree_lock)
#define flush_icache_user_range(vma,page,addr,len) \
flush_dcache_page(page)
Index: linux-2.6/include/asm-parisc/cacheflush.h
===================================================================
--- linux-2.6.orig/include/asm-parisc/cacheflush.h 2007-01-28 13:59:07.000000000 +0100
+++ linux-2.6/include/asm-parisc/cacheflush.h 2007-01-28 13:59:24.000000000 +0100
@@ -59,9 +59,9 @@ flush_user_icache_range(unsigned long st
extern void flush_dcache_page(struct page *page);
#define flush_dcache_mmap_lock(mapping) \
- write_lock_irq(&(mapping)->tree_lock)
+ spin_lock_irq(&(mapping)->tree_lock)
#define flush_dcache_mmap_unlock(mapping) \
- write_unlock_irq(&(mapping)->tree_lock)
+ spin_unlock_irq(&(mapping)->tree_lock)
#define flush_icache_page(vma,page) do { flush_kernel_dcache_page(page); flush_kernel_icache_page(page_address(page)); } while (0)
Index: linux-2.6/include/linux/fs.h
===================================================================
--- linux-2.6.orig/include/linux/fs.h 2007-01-28 13:59:07.000000000 +0100
+++ linux-2.6/include/linux/fs.h 2007-01-28 13:59:24.000000000 +0100
@@ -433,7 +433,7 @@ struct backing_dev_info;
struct address_space {
struct inode *host; /* owner: inode, block_device */
struct radix_tree_root page_tree; /* radix tree of all pages */
- rwlock_t tree_lock; /* and rwlock protecting it */
+ spinlock_t tree_lock; /* and rwlock protecting it */
unsigned int i_mmap_writable;/* count VM_SHARED mappings */
struct prio_tree_root i_mmap; /* tree of private and shared mappings */
struct list_head i_mmap_nonlinear;/*list VM_NONLINEAR mappings */
Index: linux-2.6/mm/filemap.c
===================================================================
--- linux-2.6.orig/mm/filemap.c 2007-01-28 13:59:23.000000000 +0100
+++ linux-2.6/mm/filemap.c 2007-01-28 13:59:24.000000000 +0100
@@ -128,9 +128,9 @@ void remove_from_page_cache(struct page
BUG_ON(!PageLocked(page));
- write_lock_irq(&mapping->tree_lock);
+ spin_lock_irq(&mapping->tree_lock);
__remove_from_page_cache(page);
- write_unlock_irq(&mapping->tree_lock);
+ spin_unlock_irq(&mapping->tree_lock);
}
static int sync_page(void *word)
@@ -441,7 +441,7 @@ int add_to_page_cache(struct page *page,
if (error == 0) {
set_page_no_new_refs(page);
- write_lock_irq(&mapping->tree_lock);
+ spin_lock_irq(&mapping->tree_lock);
error = radix_tree_insert(&mapping->page_tree, offset, page);
if (!error) {
page_cache_get(page);
@@ -451,7 +451,7 @@ int add_to_page_cache(struct page *page,
mapping->nrpages++;
__inc_zone_page_state(page, NR_FILE_PAGES);
}
- write_unlock_irq(&mapping->tree_lock);
+ spin_unlock_irq(&mapping->tree_lock);
end_page_no_new_refs(page);
radix_tree_preload_end();
}
Index: linux-2.6/mm/migrate.c
===================================================================
--- linux-2.6.orig/mm/migrate.c 2007-01-28 13:59:21.000000000 +0100
+++ linux-2.6/mm/migrate.c 2007-01-28 13:59:24.000000000 +0100
@@ -304,14 +304,14 @@ static int migrate_page_move_mapping(str
}
set_page_no_new_refs(page);
- write_lock_irq(&mapping->tree_lock);
+ spin_lock_irq(&mapping->tree_lock);
pslot = radix_tree_lookup_slot(&mapping->page_tree,
page_index(page));
if (page_count(page) != 2 + !!PagePrivate(page) ||
(struct page *)radix_tree_deref_slot(pslot) != page) {
- write_unlock_irq(&mapping->tree_lock);
+ spin_unlock_irq(&mapping->tree_lock);
end_page_no_new_refs(page);
return -EAGAIN;
}
@@ -329,7 +329,7 @@ static int migrate_page_move_mapping(str
radix_tree_replace_slot(pslot, newpage);
page->mapping = NULL;
- write_unlock_irq(&mapping->tree_lock);
+ spin_unlock_irq(&mapping->tree_lock);
end_page_no_new_refs(page);
/*
Index: linux-2.6/mm/page-writeback.c
===================================================================
--- linux-2.6.orig/mm/page-writeback.c 2007-01-28 13:59:20.000000000 +0100
+++ linux-2.6/mm/page-writeback.c 2007-01-28 13:59:24.000000000 +0100
@@ -765,7 +765,7 @@ int __set_page_dirty_nobuffers(struct pa
if (!mapping)
return 1;
- write_lock_irq(&mapping->tree_lock);
+ spin_lock_irq(&mapping->tree_lock);
mapping2 = page_mapping(page);
if (mapping2) { /* Race with truncate? */
BUG_ON(mapping2 != mapping);
@@ -776,7 +776,7 @@ int __set_page_dirty_nobuffers(struct pa
radix_tree_tag_set(&mapping->page_tree,
page_index(page), PAGECACHE_TAG_DIRTY);
}
- write_unlock_irq(&mapping->tree_lock);
+ spin_unlock_irq(&mapping->tree_lock);
if (mapping->host) {
/* !PageAnon && !swapper_space */
__mark_inode_dirty(mapping->host, I_DIRTY_PAGES);
@@ -913,13 +913,13 @@ int test_clear_page_writeback(struct pag
if (mapping) {
unsigned long flags;
- write_lock_irqsave(&mapping->tree_lock, flags);
+ spin_lock_irqsave(&mapping->tree_lock, flags);
ret = TestClearPageWriteback(page);
if (ret)
radix_tree_tag_clear(&mapping->page_tree,
page_index(page),
PAGECACHE_TAG_WRITEBACK);
- write_unlock_irqrestore(&mapping->tree_lock, flags);
+ spin_unlock_irqrestore(&mapping->tree_lock, flags);
} else {
ret = TestClearPageWriteback(page);
}
@@ -934,7 +934,7 @@ int test_set_page_writeback(struct page
if (mapping) {
unsigned long flags;
- write_lock_irqsave(&mapping->tree_lock, flags);
+ spin_lock_irqsave(&mapping->tree_lock, flags);
ret = TestSetPageWriteback(page);
if (!ret)
radix_tree_tag_set(&mapping->page_tree,
@@ -944,7 +944,7 @@ int test_set_page_writeback(struct page
radix_tree_tag_clear(&mapping->page_tree,
page_index(page),
PAGECACHE_TAG_DIRTY);
- write_unlock_irqrestore(&mapping->tree_lock, flags);
+ spin_unlock_irqrestore(&mapping->tree_lock, flags);
} else {
ret = TestSetPageWriteback(page);
}
Index: linux-2.6/mm/swap_state.c
===================================================================
--- linux-2.6.orig/mm/swap_state.c 2007-01-28 13:59:21.000000000 +0100
+++ linux-2.6/mm/swap_state.c 2007-01-28 13:59:24.000000000 +0100
@@ -38,7 +38,7 @@ static struct backing_dev_info swap_back
struct address_space swapper_space = {
.page_tree = RADIX_TREE_INIT(GFP_ATOMIC|__GFP_NOWARN),
- .tree_lock = __RW_LOCK_UNLOCKED(swapper_space.tree_lock),
+ .tree_lock = __SPIN_LOCK_UNLOCKED(swapper_space.tree_lock),
.a_ops = &swap_aops,
.i_mmap_nonlinear = LIST_HEAD_INIT(swapper_space.i_mmap_nonlinear),
.backing_dev_info = &swap_backing_dev_info,
@@ -79,7 +79,7 @@ static int __add_to_swap_cache(struct pa
error = radix_tree_preload(gfp_mask);
if (!error) {
set_page_no_new_refs(page);
- write_lock_irq(&swapper_space.tree_lock);
+ spin_lock_irq(&swapper_space.tree_lock);
error = radix_tree_insert(&swapper_space.page_tree,
entry.val, page);
if (!error) {
@@ -90,7 +90,7 @@ static int __add_to_swap_cache(struct pa
total_swapcache_pages++;
__inc_zone_page_state(page, NR_FILE_PAGES);
}
- write_unlock_irq(&swapper_space.tree_lock);
+ spin_unlock_irq(&swapper_space.tree_lock);
end_page_no_new_refs(page);
radix_tree_preload_end();
}
@@ -202,9 +202,9 @@ void delete_from_swap_cache(struct page
entry.val = page_private(page);
- write_lock_irq(&swapper_space.tree_lock);
+ spin_lock_irq(&swapper_space.tree_lock);
__delete_from_swap_cache(page);
- write_unlock_irq(&swapper_space.tree_lock);
+ spin_unlock_irq(&swapper_space.tree_lock);
swap_free(entry);
page_cache_release(page);
Index: linux-2.6/mm/swapfile.c
===================================================================
--- linux-2.6.orig/mm/swapfile.c 2007-01-28 13:59:08.000000000 +0100
+++ linux-2.6/mm/swapfile.c 2007-01-28 13:59:24.000000000 +0100
@@ -367,13 +367,13 @@ int remove_exclusive_swap_page(struct pa
retval = 0;
if (p->swap_map[swp_offset(entry)] == 1) {
/* Recheck the page count with the swapcache lock held.. */
- write_lock_irq(&swapper_space.tree_lock);
+ spin_lock_irq(&swapper_space.tree_lock);
if ((page_count(page) == 2) && !PageWriteback(page)) {
__delete_from_swap_cache(page);
SetPageDirty(page);
retval = 1;
}
- write_unlock_irq(&swapper_space.tree_lock);
+ spin_unlock_irq(&swapper_space.tree_lock);
}
spin_unlock(&swap_lock);
Index: linux-2.6/mm/truncate.c
===================================================================
--- linux-2.6.orig/mm/truncate.c 2007-01-28 13:59:08.000000000 +0100
+++ linux-2.6/mm/truncate.c 2007-01-28 13:59:24.000000000 +0100
@@ -333,18 +333,18 @@ invalidate_complete_page2(struct address
if (PagePrivate(page) && !try_to_release_page(page, GFP_KERNEL))
return 0;
- write_lock_irq(&mapping->tree_lock);
+ spin_lock_irq(&mapping->tree_lock);
if (PageDirty(page))
goto failed;
BUG_ON(PagePrivate(page));
__remove_from_page_cache(page);
- write_unlock_irq(&mapping->tree_lock);
+ spin_unlock_irq(&mapping->tree_lock);
ClearPageUptodate(page);
page_cache_release(page); /* pagecache ref */
return 1;
failed:
- write_unlock_irq(&mapping->tree_lock);
+ spin_unlock_irq(&mapping->tree_lock);
return 0;
}
Index: linux-2.6/mm/vmscan.c
===================================================================
--- linux-2.6.orig/mm/vmscan.c 2007-01-28 13:59:21.000000000 +0100
+++ linux-2.6/mm/vmscan.c 2007-01-28 13:59:24.000000000 +0100
@@ -391,7 +391,7 @@ int remove_mapping(struct address_space
BUG_ON(mapping != page_mapping(page));
set_page_no_new_refs(page);
- write_lock_irq(&mapping->tree_lock);
+ spin_lock_irq(&mapping->tree_lock);
/*
* The non racy check for a busy page.
*
@@ -426,13 +426,13 @@ int remove_mapping(struct address_space
if (PageSwapCache(page)) {
swp_entry_t swap = { .val = page_private(page) };
__delete_from_swap_cache(page);
- write_unlock_irq(&mapping->tree_lock);
+ spin_unlock_irq(&mapping->tree_lock);
swap_free(swap);
goto free_it;
}
__remove_from_page_cache(page);
- write_unlock_irq(&mapping->tree_lock);
+ spin_unlock_irq(&mapping->tree_lock);
free_it:
end_page_no_new_refs(page);
@@ -440,7 +440,7 @@ free_it:
return 1;
cannot_free:
- write_unlock_irq(&mapping->tree_lock);
+ spin_unlock_irq(&mapping->tree_lock);
end_page_no_new_refs(page);
return 0;
}
Index: linux-2.6/fs/inode.c
===================================================================
--- linux-2.6.orig/fs/inode.c 2007-01-28 13:59:07.000000000 +0100
+++ linux-2.6/fs/inode.c 2007-01-28 13:59:24.000000000 +0100
@@ -193,7 +193,7 @@ void inode_init_once(struct inode *inode
mutex_init(&inode->i_mutex);
init_rwsem(&inode->i_alloc_sem);
INIT_RADIX_TREE(&inode->i_data.page_tree, GFP_ATOMIC);
- rwlock_init(&inode->i_data.tree_lock);
+ spin_lock_init(&inode->i_data.tree_lock);
spin_lock_init(&inode->i_data.i_mmap_lock);
INIT_LIST_HEAD(&inode->i_data.private_list);
spin_lock_init(&inode->i_data.private_lock);
--
-
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