diff options
| author | Matthew Wilcox <willy@linux.intel.com> | 2016-03-17 14:22:06 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-03-17 15:09:34 -0700 |
| commit | 7165092fe5ca70bae722ac6cd78421cfd0eec18d (patch) | |
| tree | 93714621a6b7e4c7ba20677a5c7f408795132e8c /mm/shmem.c | |
| parent | 2cf938aae17203426a89b5955bd1c9668657bfa8 (diff) | |
| download | lwn-7165092fe5ca70bae722ac6cd78421cfd0eec18d.tar.gz lwn-7165092fe5ca70bae722ac6cd78421cfd0eec18d.zip | |
radix-tree,shmem: introduce radix_tree_iter_next()
shmem likes to occasionally drop the lock, schedule, then reacqire the
lock and continue with the iteration from the last place it left off.
This is currently done with a pretty ugly goto. Introduce
radix_tree_iter_next() and use it throughout shmem.c.
[koct9i@gmail.com: fix bug in radix_tree_iter_next() for tagged iteration]
Signed-off-by: Matthew Wilcox <willy@linux.intel.com>
Cc: Hugh Dickins <hughd@google.com>
Signed-off-by: Konstantin Khlebnikov <koct9i@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/shmem.c')
| -rw-r--r-- | mm/shmem.c | 12 |
1 files changed, 3 insertions, 9 deletions
diff --git a/mm/shmem.c b/mm/shmem.c index 91c0dadf48d3..9428c51ab2d6 100644 --- a/mm/shmem.c +++ b/mm/shmem.c @@ -376,7 +376,6 @@ unsigned long shmem_partial_swap_usage(struct address_space *mapping, rcu_read_lock(); -restart: radix_tree_for_each_slot(slot, &mapping->page_tree, &iter, start) { if (iter.index >= end) break; @@ -393,8 +392,7 @@ restart: if (need_resched()) { cond_resched_rcu(); - start = iter.index + 1; - goto restart; + slot = radix_tree_iter_next(&iter); } } @@ -1944,7 +1942,6 @@ static void shmem_tag_pins(struct address_space *mapping) start = 0; rcu_read_lock(); -restart: radix_tree_for_each_slot(slot, &mapping->page_tree, &iter, start) { page = radix_tree_deref_slot(slot); if (!page || radix_tree_exception(page)) { @@ -1961,8 +1958,7 @@ restart: if (need_resched()) { cond_resched_rcu(); - start = iter.index + 1; - goto restart; + slot = radix_tree_iter_next(&iter); } } rcu_read_unlock(); @@ -1999,7 +1995,6 @@ static int shmem_wait_for_pins(struct address_space *mapping) start = 0; rcu_read_lock(); -restart: radix_tree_for_each_tagged(slot, &mapping->page_tree, &iter, start, SHMEM_TAG_PINNED) { @@ -2033,8 +2028,7 @@ restart: continue_resched: if (need_resched()) { cond_resched_rcu(); - start = iter.index + 1; - goto restart; + slot = radix_tree_iter_next(&iter); } } rcu_read_unlock(); |