f2fs: call f2fs_balance_fs only when node was changed
If user tries to update or read data, we don't need to call f2fs_balance_fs
which triggers f2fs_gc, which increases unnecessary long latency.
Reviewed-by: Chao Yu <chao2.yu@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index 82ecaa30..958d826 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -509,7 +509,6 @@
u64 end_offset;
while (len) {
- f2fs_balance_fs(sbi);
f2fs_lock_op(sbi);
/* When reading holes, we need its node page */
@@ -542,6 +541,9 @@
f2fs_put_dnode(&dn);
f2fs_unlock_op(sbi);
+
+ if (dn.node_changed)
+ f2fs_balance_fs(sbi);
}
return;
@@ -551,6 +553,8 @@
f2fs_put_dnode(&dn);
out:
f2fs_unlock_op(sbi);
+ if (dn.node_changed)
+ f2fs_balance_fs(sbi);
return;
}
@@ -649,6 +653,8 @@
if (create) {
f2fs_unlock_op(sbi);
+ if (dn.node_changed)
+ f2fs_balance_fs(sbi);
f2fs_lock_op(sbi);
}
@@ -706,8 +712,11 @@
put_out:
f2fs_put_dnode(&dn);
unlock_out:
- if (create)
+ if (create) {
f2fs_unlock_op(sbi);
+ if (dn.node_changed)
+ f2fs_balance_fs(sbi);
+ }
out:
trace_f2fs_map_blocks(inode, map, err);
return err;
@@ -1415,8 +1424,6 @@
trace_f2fs_write_begin(inode, pos, len, flags);
- f2fs_balance_fs(sbi);
-
/*
* We should check this at this moment to avoid deadlock on inode page
* and #0 page. The locking rule for inline_data conversion should be:
@@ -1466,6 +1473,17 @@
f2fs_put_dnode(&dn);
f2fs_unlock_op(sbi);
+ if (dn.node_changed && has_not_enough_free_secs(sbi, 0)) {
+ unlock_page(page);
+ f2fs_balance_fs(sbi);
+ lock_page(page);
+ if (page->mapping != mapping) {
+ /* The page got truncated from under us */
+ f2fs_put_page(page, 1);
+ goto repeat;
+ }
+ }
+
f2fs_wait_on_page_writeback(page, DATA);
/* wait for GCed encrypted page writeback */