Merge branch 'for-3.9/core' of git://git.kernel.dk/linux-block

Pull block IO core bits from Jens Axboe: "Below are the core block IO bits for 3.9. It was delayed a few days since my workstation kept crashing every 2-8h after pulling it into current -git, but turns out it is a bug in the new pstate code (divide by zero, will report separately). In any case, it contains: - The big cfq/blkcg update from Tejun and and Vivek. - Additional block and writeback tracepoints from Tejun. - Improvement of the should sort (based on queues) logic in the plug flushing. - _io() variants of the wait_for_completion() interface, using io_schedule() instead of schedule() to contribute to io wait properly. - Various little fixes. You'll get two trivial merge conflicts, which should be easy enough to fix up" Fix up the trivial conflicts due to hlist traversal cleanups (commit b67bfe0d42: "hlist: drop the node parameter from iterators"). * 'for-3.9/core' of git://git.kernel.dk/linux-block: (39 commits) block: remove redundant check to bd_openers() block: use i_size_write() in bd_set_size() cfq: fix lock imbalance with failed allocations drivers/block/swim3.c: fix null pointer dereference block: don't select PERCPU_RWSEM block: account iowait time when waiting for completion of IO request sched: add wait_for_completion_io[_timeout] writeback: add more tracepoints block: add block_{touch|dirty}_buffer tracepoint buffer: make touch_buffer() an exported function block: add @req to bio_{front|back}_merge tracepoints block: add missing block_bio_complete() tracepoint block: Remove should_sort judgement when flush blk_plug block,elevator: use new hashtable implementation cfq-iosched: add hierarchical cfq_group statistics cfq-iosched: collect stats from dead cfqgs cfq-iosched: separate out cfqg_stats_reset() from cfq_pd_reset_stats() blkcg: make blkcg_print_blkgs() grab q locks instead of blkcg lock block: RCU free request_queue blkcg: implement blkg_[rw]stat_recursive_sum() and blkg_[rw]stat_merge() ...
2013-02-28 12:52:24 -08:00
parent 21f3b24da9 de33127d8d
commit ee89f81252
30 changed files with 1246 additions and 258 deletions
--- a/include/trace/events/block.h
+++ b/include/trace/events/block.h
@@ -6,10 +6,61 @@

 #include <linux/blktrace_api.h>
 #include <linux/blkdev.h>
+#include <linux/buffer_head.h>
 #include <linux/tracepoint.h>

 #define RWBS_LEN	8

+DECLARE_EVENT_CLASS(block_buffer,
+
+	TP_PROTO(struct buffer_head *bh),
+
+	TP_ARGS(bh),
+
+	TP_STRUCT__entry (
+		__field(  dev_t,	dev			)
+		__field(  sector_t,	sector			)
+		__field(  size_t,	size			)
+	),
+
+	TP_fast_assign(
+		__entry->dev		= bh->b_bdev->bd_dev;
+		__entry->sector		= bh->b_blocknr;
+		__entry->size		= bh->b_size;
+	),
+
+	TP_printk("%d,%d sector=%llu size=%zu",
+		MAJOR(__entry->dev), MINOR(__entry->dev),
+		(unsigned long long)__entry->sector, __entry->size
+	)
+);
+
+/**
+ * block_touch_buffer - mark a buffer accessed
+ * @bh: buffer_head being touched
+ *
+ * Called from touch_buffer().
+ */
+DEFINE_EVENT(block_buffer, block_touch_buffer,
+
+	TP_PROTO(struct buffer_head *bh),
+
+	TP_ARGS(bh)
+);
+
+/**
+ * block_dirty_buffer - mark a buffer dirty
+ * @bh: buffer_head being dirtied
+ *
+ * Called from mark_buffer_dirty().
+ */
+DEFINE_EVENT(block_buffer, block_dirty_buffer,
+
+	TP_PROTO(struct buffer_head *bh),
+
+	TP_ARGS(bh)
+);
+
 DECLARE_EVENT_CLASS(block_rq_with_error,

 	TP_PROTO(struct request_queue *q, struct request *rq),
@@ -206,7 +257,6 @@ TRACE_EVENT(block_bio_bounce,

 /**
 * block_bio_complete - completed all work on the block operation
- * @q: queue holding the block operation
 * @bio: block operation completed
 * @error: io error value
 *
@@ -215,9 +265,9 @@ TRACE_EVENT(block_bio_bounce,
 */
 TRACE_EVENT(block_bio_complete,

-	TP_PROTO(struct request_queue *q, struct bio *bio, int error),
+	TP_PROTO(struct bio *bio, int error),

-	TP_ARGS(q, bio, error),
+	TP_ARGS(bio, error),

 	TP_STRUCT__entry(
 		__field( dev_t,		dev		)
@@ -228,7 +278,8 @@ TRACE_EVENT(block_bio_complete,
 	),

 	TP_fast_assign(
-		__entry->dev		= bio->bi_bdev->bd_dev;
+		__entry->dev		= bio->bi_bdev ?
+					  bio->bi_bdev->bd_dev : 0;
 		__entry->sector		= bio->bi_sector;
 		__entry->nr_sector	= bio->bi_size >> 9;
 		__entry->error		= error;
@@ -241,11 +292,11 @@ TRACE_EVENT(block_bio_complete,
 		  __entry->nr_sector, __entry->error)
 );

-DECLARE_EVENT_CLASS(block_bio,
+DECLARE_EVENT_CLASS(block_bio_merge,

-	TP_PROTO(struct request_queue *q, struct bio *bio),
+	TP_PROTO(struct request_queue *q, struct request *rq, struct bio *bio),

-	TP_ARGS(q, bio),
+	TP_ARGS(q, rq, bio),

 	TP_STRUCT__entry(
 		__field( dev_t,		dev			)
@@ -272,31 +323,33 @@ DECLARE_EVENT_CLASS(block_bio,
 /**
 * block_bio_backmerge - merging block operation to the end of an existing operation
 * @q: queue holding operation
+ * @rq: request bio is being merged into
 * @bio: new block operation to merge
 *
 * Merging block request @bio to the end of an existing block request
 * in queue @q.
 */
-DEFINE_EVENT(block_bio, block_bio_backmerge,
+DEFINE_EVENT(block_bio_merge, block_bio_backmerge,

-	TP_PROTO(struct request_queue *q, struct bio *bio),
+	TP_PROTO(struct request_queue *q, struct request *rq, struct bio *bio),

-	TP_ARGS(q, bio)
+	TP_ARGS(q, rq, bio)
 );

 /**
 * block_bio_frontmerge - merging block operation to the beginning of an existing operation
 * @q: queue holding operation
+ * @rq: request bio is being merged into
 * @bio: new block operation to merge
 *
 * Merging block IO operation @bio to the beginning of an existing block
 * operation in queue @q.
 */
-DEFINE_EVENT(block_bio, block_bio_frontmerge,
+DEFINE_EVENT(block_bio_merge, block_bio_frontmerge,

-	TP_PROTO(struct request_queue *q, struct bio *bio),
+	TP_PROTO(struct request_queue *q, struct request *rq, struct bio *bio),

-	TP_ARGS(q, bio)
+	TP_ARGS(q, rq, bio)
 );

 /**
@@ -306,11 +359,32 @@ DEFINE_EVENT(block_bio, block_bio_frontmerge,
 *
 * About to place the block IO operation @bio into queue @q.
 */
-DEFINE_EVENT(block_bio, block_bio_queue,
+TRACE_EVENT(block_bio_queue,

 	TP_PROTO(struct request_queue *q, struct bio *bio),

-	TP_ARGS(q, bio)
+	TP_ARGS(q, bio),
+
+	TP_STRUCT__entry(
+		__field( dev_t,		dev			)
+		__field( sector_t,	sector			)
+		__field( unsigned int,	nr_sector		)
+		__array( char,		rwbs,	RWBS_LEN	)
+		__array( char,		comm,	TASK_COMM_LEN	)
+	),
+
+	TP_fast_assign(
+		__entry->dev		= bio->bi_bdev->bd_dev;
+		__entry->sector		= bio->bi_sector;
+		__entry->nr_sector	= bio->bi_size >> 9;
+		blk_fill_rwbs(__entry->rwbs, bio->bi_rw, bio->bi_size);
+		memcpy(__entry->comm, current->comm, TASK_COMM_LEN);
+	),
+
+	TP_printk("%d,%d %s %llu + %u [%s]",
+		  MAJOR(__entry->dev), MINOR(__entry->dev), __entry->rwbs,
+		  (unsigned long long)__entry->sector,
+		  __entry->nr_sector, __entry->comm)
 );

 DECLARE_EVENT_CLASS(block_get_rq,
--- a/include/trace/events/writeback.h
+++ b/include/trace/events/writeback.h
@@ -32,6 +32,115 @@

 struct wb_writeback_work;

+TRACE_EVENT(writeback_dirty_page,
+
+	TP_PROTO(struct page *page, struct address_space *mapping),
+
+	TP_ARGS(page, mapping),
+
+	TP_STRUCT__entry (
+		__array(char, name, 32)
+		__field(unsigned long, ino)
+		__field(pgoff_t, index)
+	),
+
+	TP_fast_assign(
+		strncpy(__entry->name,
+			mapping ? dev_name(mapping->backing_dev_info->dev) : "(unknown)", 32);
+		__entry->ino = mapping ? mapping->host->i_ino : 0;
+		__entry->index = page->index;
+	),
+
+	TP_printk("bdi %s: ino=%lu index=%lu",
+		__entry->name,
+		__entry->ino,
+		__entry->index
+	)
+);
+
+DECLARE_EVENT_CLASS(writeback_dirty_inode_template,
+
+	TP_PROTO(struct inode *inode, int flags),
+
+	TP_ARGS(inode, flags),
+
+	TP_STRUCT__entry (
+		__array(char, name, 32)
+		__field(unsigned long, ino)
+		__field(unsigned long, flags)
+	),
+
+	TP_fast_assign(
+		struct backing_dev_info *bdi = inode->i_mapping->backing_dev_info;
+
+		/* may be called for files on pseudo FSes w/ unregistered bdi */
+		strncpy(__entry->name,
+			bdi->dev ? dev_name(bdi->dev) : "(unknown)", 32);
+		__entry->ino		= inode->i_ino;
+		__entry->flags		= flags;
+	),
+
+	TP_printk("bdi %s: ino=%lu flags=%s",
+		__entry->name,
+		__entry->ino,
+		show_inode_state(__entry->flags)
+	)
+);
+
+DEFINE_EVENT(writeback_dirty_inode_template, writeback_dirty_inode_start,
+
+	TP_PROTO(struct inode *inode, int flags),
+
+	TP_ARGS(inode, flags)
+);
+
+DEFINE_EVENT(writeback_dirty_inode_template, writeback_dirty_inode,
+
+	TP_PROTO(struct inode *inode, int flags),
+
+	TP_ARGS(inode, flags)
+);
+
+DECLARE_EVENT_CLASS(writeback_write_inode_template,
+
+	TP_PROTO(struct inode *inode, struct writeback_control *wbc),
+
+	TP_ARGS(inode, wbc),
+
+	TP_STRUCT__entry (
+		__array(char, name, 32)
+		__field(unsigned long, ino)
+		__field(int, sync_mode)
+	),
+
+	TP_fast_assign(
+		strncpy(__entry->name,
+			dev_name(inode->i_mapping->backing_dev_info->dev), 32);
+		__entry->ino		= inode->i_ino;
+		__entry->sync_mode	= wbc->sync_mode;
+	),
+
+	TP_printk("bdi %s: ino=%lu sync_mode=%d",
+		__entry->name,
+		__entry->ino,
+		__entry->sync_mode
+	)
+);
+
+DEFINE_EVENT(writeback_write_inode_template, writeback_write_inode_start,
+
+	TP_PROTO(struct inode *inode, struct writeback_control *wbc),
+
+	TP_ARGS(inode, wbc)
+);
+
+DEFINE_EVENT(writeback_write_inode_template, writeback_write_inode,
+
+	TP_PROTO(struct inode *inode, struct writeback_control *wbc),
+
+	TP_ARGS(inode, wbc)
+);
+
 DECLARE_EVENT_CLASS(writeback_work_class,
 	TP_PROTO(struct backing_dev_info *bdi, struct wb_writeback_work *work),
 	TP_ARGS(bdi, work),
@@ -479,6 +588,13 @@ DECLARE_EVENT_CLASS(writeback_single_inode_template,
 	)
 );

+DEFINE_EVENT(writeback_single_inode_template, writeback_single_inode_start,
+	TP_PROTO(struct inode *inode,
+		 struct writeback_control *wbc,
+		 unsigned long nr_to_write),
+	TP_ARGS(inode, wbc, nr_to_write)
+);
+
 DEFINE_EVENT(writeback_single_inode_template, writeback_single_inode,
 	TP_PROTO(struct inode *inode,
 		 struct writeback_control *wbc,