writeback: Add tracing to balance_dirty_pages

[linux-2.6-microblaze.git] / fs / fs-writeback.c

diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
index 73acab4..bf10cbf 100644 (file)
--- a/fs/fs-writeback.c
+++ b/fs/fs-writeback.c
@@ -656,10 +656,14 @@ static long wb_writeback(struct bdi_writeback *wb,
                wbc.more_io = 0;
                wbc.nr_to_write = MAX_WRITEBACK_PAGES;
                wbc.pages_skipped = 0;
+
+               trace_wbc_writeback_start(&wbc, wb->bdi);
                if (work->sb)
                        __writeback_inodes_sb(work->sb, wb, &wbc);
                else
                        writeback_inodes_wb(wb, &wbc);
+               trace_wbc_writeback_written(&wbc, wb->bdi);
+
                work->nr_pages -= MAX_WRITEBACK_PAGES - wbc.nr_to_write;
                wrote += MAX_WRITEBACK_PAGES - wbc.nr_to_write;
 
@@ -687,6 +691,7 @@ static long wb_writeback(struct bdi_writeback *wb,
                if (!list_empty(&wb->b_more_io))  {
                        inode = list_entry(wb->b_more_io.prev,
                                                struct inode, i_list);
+                       trace_wbc_writeback_wait(&wbc, wb->bdi);
                        inode_wait_for_writeback(inode);
                }
                spin_unlock(&inode_lock);