The patch titled
mm: use lockless radix-tree probe
has been removed from the -mm tree. Its filename was
mm-use-lockless-radix-tree-probe.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
Subject: mm: use lockless radix-tree probe
From: Nick Piggin <npiggin@xxxxxxx>
Probing pages and radix_tree_tagged are lockless operations with the lockless
radix-tree. Convert these users to RCU locking rather than using tree_lock.
Signed-off-by: Nick Piggin <npiggin@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/page-writeback.c | 8 +++-----
mm/readahead.c | 6 ++----
2 files changed, 5 insertions(+), 9 deletions(-)
diff -puN mm/page-writeback.c~mm-use-lockless-radix-tree-probe mm/page-writeback.c
--- a/mm/page-writeback.c~mm-use-lockless-radix-tree-probe
+++ a/mm/page-writeback.c
@@ -1022,17 +1022,15 @@ int test_set_page_writeback(struct page
EXPORT_SYMBOL(test_set_page_writeback);
/*
- * Return true if any of the pages in the mapping are marged with the
+ * Return true if any of the pages in the mapping are marked with the
* passed tag.
*/
int mapping_tagged(struct address_space *mapping, int tag)
{
- unsigned long flags;
int ret;
-
- read_lock_irqsave(&mapping->tree_lock, flags);
+ rcu_read_lock();
ret = radix_tree_tagged(&mapping->page_tree, tag);
- read_unlock_irqrestore(&mapping->tree_lock, flags);
+ rcu_read_unlock();
return ret;
}
EXPORT_SYMBOL(mapping_tagged);
diff -puN mm/readahead.c~mm-use-lockless-radix-tree-probe mm/readahead.c
--- a/mm/readahead.c~mm-use-lockless-radix-tree-probe
+++ a/mm/readahead.c
@@ -149,20 +149,19 @@ __do_page_cache_readahead(struct address
/*
* Preallocate as many pages as we will need.
*/
- read_lock_irq(&mapping->tree_lock);
for (page_idx = 0; page_idx < nr_to_read; page_idx++) {
pgoff_t page_offset = offset + page_idx;
if (page_offset > end_index)
break;
+ rcu_read_lock();
page = radix_tree_lookup(&mapping->page_tree, page_offset);
+ rcu_read_unlock();
if (page)
continue;
- read_unlock_irq(&mapping->tree_lock);
page = page_cache_alloc_cold(mapping);
- read_lock_irq(&mapping->tree_lock);
if (!page)
break;
page->index = page_offset;
@@ -171,7 +170,6 @@ __do_page_cache_readahead(struct address
SetPageReadahead(page);
ret++;
}
- read_unlock_irq(&mapping->tree_lock);
/*
* Now start the IO. We ignore I/O errors - if the page is not
_
Patches currently in -mm which might be from npiggin@xxxxxxx are
origin.patch
mm-document-tree_lock-zonelock-lockorder.patch
fs-reiserfs-cleanups.patch
atomic_opstxt-has-incorrect-misleading-and-insufficient-information.patch
fs-introduce-write_begin-write_end-and-perform_write-aops-revoke.patch
fs-introduce-write_begin-write_end-and-perform_write-aops-revoke-fix.patch
bitops-introduce-lock-ops.patch
alpha-fix-bitops.patch
alpha-lock-bitops.patch
alpha-lock-bitops-fix.patch
ia64-lock-bitops.patch
mips-fix-bitops.patch
mips-lock-bitops.patch
powerpc-lock-bitops.patch
powerpc-lock-bitops-fix.patch
bit_spin_lock-use-lock-bitops.patch
reiser4-fix-for-new-aops-patches.patch
-
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