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f2fs: reduce competition among node page writes

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We do not need to block on ->node_write among different node page writers e.g.
fsync/flush, unless we have a node page writer from write_checkpoint.
So it's better use rw_semaphore instead of mutex type for ->node_write to
promote performance.

Signed-off-by: Chao Yu <chao2.yu@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Chao Yu
2014-07-03 18:58:39 +08:00
committed by Jaegeuk Kim
parent 65b85ccce0
commit b3582c6892
4 changed files with 7 additions and 7 deletions
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4
fs/f2fs/node.c
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@@ -1231,12 +1231,12 @@ static int f2fs_write_node_page(struct page *page,
if (wbc->for_reclaim)
goto redirty_out;
mutex_lock(&sbi->node_write);
down_read(&sbi->node_write);
set_page_writeback(page);
write_node_page(sbi, page, &fio, nid, ni.blk_addr, &new_addr);
set_node_addr(sbi, &ni, new_addr, is_fsync_dnode(page));
dec_page_count(sbi, F2FS_DIRTY_NODES);
mutex_unlock(&sbi->node_write);
up_read(&sbi->node_write);
unlock_page(page);
return 0;