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f2fs: call f2fs_balance_fs only when node was changed

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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>
This commit is contained in:
Jaegeuk Kim
2015-12-22 13:23:35 -08:00
parent 3104af35eb
commit 2a34076070
3 changed files with 35 additions and 21 deletions
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26
fs/f2fs/data.c
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@@ -509,7 +509,6 @@ static void __allocate_data_blocks(struct inode *inode, loff_t offset,
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 @@ static void __allocate_data_blocks(struct inode *inode, loff_t offset,
f2fs_put_dnode(&dn);
f2fs_unlock_op(sbi);
if (dn.node_changed)
f2fs_balance_fs(sbi);
}
return;
@@ -551,6 +553,8 @@ sync_out:
f2fs_put_dnode(&dn);
out:
f2fs_unlock_op(sbi);
if (dn.node_changed)
f2fs_balance_fs(sbi);
return;
}
@@ -649,6 +653,8 @@ get_next:
if (create) {
f2fs_unlock_op(sbi);
if (dn.node_changed)
f2fs_balance_fs(sbi);
f2fs_lock_op(sbi);
}
@@ -706,8 +712,11 @@ sync_out:
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 @@ static int f2fs_write_begin(struct file *file, struct address_space *mapping,
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 @@ put_next:
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 */