From: Nick Piggin Date: Wed, 17 Oct 2007 06:26:02 +0000 (-0700) Subject: mm: document tree_lock->zone.lock lockorder X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=7a4050791b23c55a451974027d41d72a9b78039b;p=deliverable%2Flinux.git mm: document tree_lock->zone.lock lockorder zone->lock is quite an "inner" lock and mostly constrained to page alloc as well, so like slab locks, it probably isn't something that is critically important to document here. However unlike slab locks, zone lock could be used more widely in future, and page_alloc.c might possibly have more business to do tricky things with pagecache than does slab. So... I don't think it hurts to document it. Signed-off-by: Nick Piggin Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/mm/filemap.c b/mm/filemap.c index c6049e947cd9..4fb1546bbad6 100644 --- a/mm/filemap.c +++ b/mm/filemap.c @@ -63,6 +63,7 @@ generic_file_direct_IO(int rw, struct kiocb *iocb, const struct iovec *iov, * ->private_lock (__free_pte->__set_page_dirty_buffers) * ->swap_lock (exclusive_swap_page, others) * ->mapping->tree_lock + * ->zone.lock * * ->i_mutex * ->i_mmap_lock (truncate->unmap_mapping_range) diff --git a/mm/rmap.c b/mm/rmap.c index f6e85d7a7e45..8990f909492f 100644 --- a/mm/rmap.c +++ b/mm/rmap.c @@ -36,6 +36,7 @@ * mapping->tree_lock (widely used, in set_page_dirty, * in arch-dependent flush_dcache_mmap_lock, * within inode_lock in __sync_single_inode) + * zone->lock (within radix tree node alloc) */ #include