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-rw-r--r--fs/fs-writeback.c38
1 files changed, 30 insertions, 8 deletions
diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
index c8471b3ddccf..73acab4dc2b7 100644
--- a/fs/fs-writeback.c
+++ b/fs/fs-writeback.c
@@ -26,15 +26,9 @@
#include <linux/blkdev.h>
#include <linux/backing-dev.h>
#include <linux/buffer_head.h>
+#include <linux/tracepoint.h>
#include "internal.h"
-#define inode_to_bdi(inode) ((inode)->i_mapping->backing_dev_info)
-
-/*
- * We don't actually have pdflush, but this one is exported though /proc...
- */
-int nr_pdflush_threads;
-
/*
* Passed into wb_writeback(), essentially a subset of writeback_control
*/
@@ -50,6 +44,21 @@ struct wb_writeback_work {
struct completion *done; /* set if the caller waits */
};
+/*
+ * Include the creation of the trace points after defining the
+ * wb_writeback_work structure so that the definition remains local to this
+ * file.
+ */
+#define CREATE_TRACE_POINTS
+#include <trace/events/writeback.h>
+
+#define inode_to_bdi(inode) ((inode)->i_mapping->backing_dev_info)
+
+/*
+ * We don't actually have pdflush, but this one is exported though /proc...
+ */
+int nr_pdflush_threads;
+
/**
* writeback_in_progress - determine whether there is writeback in progress
* @bdi: the device's backing_dev_info structure.
@@ -65,6 +74,8 @@ int writeback_in_progress(struct backing_dev_info *bdi)
static void bdi_queue_work(struct backing_dev_info *bdi,
struct wb_writeback_work *work)
{
+ trace_writeback_queue(bdi, work);
+
spin_lock(&bdi->wb_lock);
list_add_tail(&work->list, &bdi->work_list);
spin_unlock(&bdi->wb_lock);
@@ -74,6 +85,7 @@ static void bdi_queue_work(struct backing_dev_info *bdi,
* it gets created and wakes up, we'll run this work.
*/
if (unlikely(!bdi->wb.task)) {
+ trace_writeback_nothread(bdi, work);
wake_up_process(default_backing_dev_info.wb.task);
} else {
struct bdi_writeback *wb = &bdi->wb;
@@ -95,8 +107,10 @@ __bdi_start_writeback(struct backing_dev_info *bdi, long nr_pages,
*/
work = kzalloc(sizeof(*work), GFP_ATOMIC);
if (!work) {
- if (bdi->wb.task)
+ if (bdi->wb.task) {
+ trace_writeback_nowork(bdi);
wake_up_process(bdi->wb.task);
+ }
return;
}
@@ -751,6 +765,8 @@ long wb_do_writeback(struct bdi_writeback *wb, int force_wait)
if (force_wait)
work->sync_mode = WB_SYNC_ALL;
+ trace_writeback_exec(bdi, work);
+
wrote += wb_writeback(wb, work);
/*
@@ -805,9 +821,13 @@ int bdi_writeback_thread(void *data)
smp_mb__after_clear_bit();
wake_up_bit(&bdi->state, BDI_pending);
+ trace_writeback_thread_start(bdi);
+
while (!kthread_should_stop()) {
pages_written = wb_do_writeback(wb, 0);
+ trace_writeback_pages_written(pages_written);
+
if (pages_written)
last_active = jiffies;
else if (wait_jiffies != -1UL) {
@@ -845,6 +865,8 @@ int bdi_writeback_thread(void *data)
*/
if (!list_empty(&bdi->work_list))
wb_do_writeback(wb, 1);
+
+ trace_writeback_thread_stop(bdi);
return 0;
}