writeback: split writeback_inodes_wb

[linux-2.6/next.git] / include / trace / events / block.h

#undef TRACE_SYSTEM
#define TRACE_SYSTEM block

#if !defined(_TRACE_BLOCK_H) || defined(TRACE_HEADER_MULTI_READ)
#define _TRACE_BLOCK_H

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

DECLARE_EVENT_CLASS(block_rq_with_error,

        TP_PROTO(struct request_queue *q, struct request *rq),

        TP_ARGS(q, rq),

        TP_STRUCT__entry(
                __field(  dev_t,        dev                     )
                __field(  sector_t,     sector                  )
                __field(  unsigned int, nr_sector               )
                __field(  int,          errors                  )
                __array(  char,         rwbs,   6               )
                __dynamic_array( char,  cmd,    blk_cmd_buf_len(rq)     )
        ),

        TP_fast_assign(
                __entry->dev       = rq->rq_disk ? disk_devt(rq->rq_disk) : 0;
                __entry->sector    = blk_pc_request(rq) ? 0 : blk_rq_pos(rq);
                __entry->nr_sector = blk_pc_request(rq) ? 0 : blk_rq_sectors(rq);
                __entry->errors    = rq->errors;

                blk_fill_rwbs_rq(__entry->rwbs, rq);
                blk_dump_cmd(__get_str(cmd), rq);
        ),

        TP_printk("%d,%d %s (%s) %llu + %u [%d]",
                  MAJOR(__entry->dev), MINOR(__entry->dev),
                  __entry->rwbs, __get_str(cmd),
                  (unsigned long long)__entry->sector,
                  __entry->nr_sector, __entry->errors)
);

/**
 * block_rq_abort - abort block operation request
 * @q: queue containing the block operation request
 * @rq: block IO operation request
 *
 * Called immediately after pending block IO operation request @rq in
 * queue @q is aborted. The fields in the operation request @rq
 * can be examined to determine which device and sectors the pending
 * operation would access.
 */
DEFINE_EVENT(block_rq_with_error, block_rq_abort,

        TP_PROTO(struct request_queue *q, struct request *rq),

        TP_ARGS(q, rq)
);

/**
 * block_rq_requeue - place block IO request back on a queue
 * @q: queue holding operation
 * @rq: block IO operation request
 *
 * The block operation request @rq is being placed back into queue
 * @q.  For some reason the request was not completed and needs to be
 * put back in the queue.
 */
DEFINE_EVENT(block_rq_with_error, block_rq_requeue,

        TP_PROTO(struct request_queue *q, struct request *rq),

        TP_ARGS(q, rq)
);

/**
 * block_rq_complete - block IO operation completed by device driver
 * @q: queue containing the block operation request
 * @rq: block operations request
 *
 * The block_rq_complete tracepoint event indicates that some portion
 * of operation request has been completed by the device driver.  If
 * the @rq->bio is %NULL, then there is absolutely no additional work to
 * do for the request. If @rq->bio is non-NULL then there is
 * additional work required to complete the request.
 */
DEFINE_EVENT(block_rq_with_error, block_rq_complete,

        TP_PROTO(struct request_queue *q, struct request *rq),

        TP_ARGS(q, rq)
);

DECLARE_EVENT_CLASS(block_rq,

        TP_PROTO(struct request_queue *q, struct request *rq),

        TP_ARGS(q, rq),

        TP_STRUCT__entry(
                __field(  dev_t,        dev                     )
                __field(  sector_t,     sector                  )
                __field(  unsigned int, nr_sector               )
                __field(  unsigned int, bytes                   )
                __array(  char,         rwbs,   6               )
                __array(  char,         comm,   TASK_COMM_LEN   )
                __dynamic_array( char,  cmd,    blk_cmd_buf_len(rq)     )
        ),

        TP_fast_assign(
                __entry->dev       = rq->rq_disk ? disk_devt(rq->rq_disk) : 0;
                __entry->sector    = blk_pc_request(rq) ? 0 : blk_rq_pos(rq);
                __entry->nr_sector = blk_pc_request(rq) ? 0 : blk_rq_sectors(rq);
                __entry->bytes     = blk_pc_request(rq) ? blk_rq_bytes(rq) : 0;

                blk_fill_rwbs_rq(__entry->rwbs, rq);
                blk_dump_cmd(__get_str(cmd), rq);
                memcpy(__entry->comm, current->comm, TASK_COMM_LEN);
        ),

        TP_printk("%d,%d %s %u (%s) %llu + %u [%s]",
                  MAJOR(__entry->dev), MINOR(__entry->dev),
                  __entry->rwbs, __entry->bytes, __get_str(cmd),
                  (unsigned long long)__entry->sector,
                  __entry->nr_sector, __entry->comm)
);

/**
 * block_rq_insert - insert block operation request into queue
 * @q: target queue
 * @rq: block IO operation request
 *
 * Called immediately before block operation request @rq is inserted
 * into queue @q.  The fields in the operation request @rq struct can
 * be examined to determine which device and sectors the pending
 * operation would access.
 */
DEFINE_EVENT(block_rq, block_rq_insert,

        TP_PROTO(struct request_queue *q, struct request *rq),

        TP_ARGS(q, rq)
);

/**
 * block_rq_issue - issue pending block IO request operation to device driver
 * @q: queue holding operation
 * @rq: block IO operation operation request
 *
 * Called when block operation request @rq from queue @q is sent to a
 * device driver for processing.
 */
DEFINE_EVENT(block_rq, block_rq_issue,

        TP_PROTO(struct request_queue *q, struct request *rq),

        TP_ARGS(q, rq)
);

/**
 * block_bio_bounce - used bounce buffer when processing block operation
 * @q: queue holding the block operation
 * @bio: block operation
 *
 * A bounce buffer was used to handle the block operation @bio in @q.
 * This occurs when hardware limitations prevent a direct transfer of
 * data between the @bio data memory area and the IO device.  Use of a
 * bounce buffer requires extra copying of data and decreases
 * performance.
 */
TRACE_EVENT(block_bio_bounce,

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

        TP_ARGS(q, bio),

        TP_STRUCT__entry(
                __field( dev_t,         dev                     )
                __field( sector_t,      sector                  )
                __field( unsigned int,  nr_sector               )
                __array( char,          rwbs,   6               )
                __array( char,          comm,   TASK_COMM_LEN   )
        ),

        TP_fast_assign(
                __entry->dev            = bio->bi_bdev ?
                                          bio->bi_bdev->bd_dev : 0;
                __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)
);

/**
 * block_bio_complete - completed all work on the block operation
 * @q: queue holding the block operation
 * @bio: block operation completed
 *
 * This tracepoint indicates there is no further work to do on this
 * block IO operation @bio.
 */
TRACE_EVENT(block_bio_complete,

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

        TP_ARGS(q, bio),

        TP_STRUCT__entry(
                __field( dev_t,         dev             )
                __field( sector_t,      sector          )
                __field( unsigned,      nr_sector       )
                __field( int,           error           )
                __array( char,          rwbs,   6       )
        ),

        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);
        ),

        TP_printk("%d,%d %s %llu + %u [%d]",
                  MAJOR(__entry->dev), MINOR(__entry->dev), __entry->rwbs,
                  (unsigned long long)__entry->sector,
                  __entry->nr_sector, __entry->error)
);

DECLARE_EVENT_CLASS(block_bio,

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

        TP_ARGS(q, bio),

        TP_STRUCT__entry(
                __field( dev_t,         dev                     )
                __field( sector_t,      sector                  )
                __field( unsigned int,  nr_sector               )
                __array( char,          rwbs,   6               )
                __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)
);

/**
 * block_bio_backmerge - merging block operation to the end of an existing operation
 * @q: queue holding operation
 * @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,

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

        TP_ARGS(q, bio)
);

/**
 * block_bio_frontmerge - merging block operation to the beginning of an existing operation
 * @q: queue holding operation
 * @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,

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

        TP_ARGS(q, bio)
);

/**
 * block_bio_queue - putting new block IO operation in queue
 * @q: queue holding operation
 * @bio: new block operation
 *
 * About to place the block IO operation @bio into queue @q.
 */
DEFINE_EVENT(block_bio, block_bio_queue,

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

        TP_ARGS(q, bio)
);

DECLARE_EVENT_CLASS(block_get_rq,

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

        TP_ARGS(q, bio, rw),

        TP_STRUCT__entry(
                __field( dev_t,         dev                     )
                __field( sector_t,      sector                  )
                __field( unsigned int,  nr_sector               )
                __array( char,          rwbs,   6               )
                __array( char,          comm,   TASK_COMM_LEN   )
        ),

        TP_fast_assign(
                __entry->dev            = bio ? bio->bi_bdev->bd_dev : 0;
                __entry->sector         = bio ? bio->bi_sector : 0;
                __entry->nr_sector      = bio ? bio->bi_size >> 9 : 0;
                blk_fill_rwbs(__entry->rwbs,
                              bio ? bio->bi_rw : 0, __entry->nr_sector);
                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)
);

/**
 * block_getrq - get a free request entry in queue for block IO operations
 * @q: queue for operations
 * @bio: pending block IO operation
 * @rw: low bit indicates a read (%0) or a write (%1)
 *
 * A request struct for queue @q has been allocated to handle the
 * block IO operation @bio.
 */
DEFINE_EVENT(block_get_rq, block_getrq,

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

        TP_ARGS(q, bio, rw)
);

/**
 * block_sleeprq - waiting to get a free request entry in queue for block IO operation
 * @q: queue for operation
 * @bio: pending block IO operation
 * @rw: low bit indicates a read (%0) or a write (%1)
 *
 * In the case where a request struct cannot be provided for queue @q
 * the process needs to wait for an request struct to become
 * available.  This tracepoint event is generated each time the
 * process goes to sleep waiting for request struct become available.
 */
DEFINE_EVENT(block_get_rq, block_sleeprq,

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

        TP_ARGS(q, bio, rw)
);

/**
 * block_plug - keep operations requests in request queue
 * @q: request queue to plug
 *
 * Plug the request queue @q.  Do not allow block operation requests
 * to be sent to the device driver. Instead, accumulate requests in
 * the queue to improve throughput performance of the block device.
 */
TRACE_EVENT(block_plug,

        TP_PROTO(struct request_queue *q),

        TP_ARGS(q),

        TP_STRUCT__entry(
                __array( char,          comm,   TASK_COMM_LEN   )
        ),

        TP_fast_assign(
                memcpy(__entry->comm, current->comm, TASK_COMM_LEN);
        ),

        TP_printk("[%s]", __entry->comm)
);

DECLARE_EVENT_CLASS(block_unplug,

        TP_PROTO(struct request_queue *q),

        TP_ARGS(q),

        TP_STRUCT__entry(
                __field( int,           nr_rq                   )
                __array( char,          comm,   TASK_COMM_LEN   )
        ),

        TP_fast_assign(
                __entry->nr_rq  = q->rq.count[READ] + q->rq.count[WRITE];
                memcpy(__entry->comm, current->comm, TASK_COMM_LEN);
        ),

        TP_printk("[%s] %d", __entry->comm, __entry->nr_rq)
);

/**
 * block_unplug_timer - timed release of operations requests in queue to device driver
 * @q: request queue to unplug
 *
 * Unplug the request queue @q because a timer expired and allow block
 * operation requests to be sent to the device driver.
 */
DEFINE_EVENT(block_unplug, block_unplug_timer,

        TP_PROTO(struct request_queue *q),

        TP_ARGS(q)
);

/**
 * block_unplug_io - release of operations requests in request queue
 * @q: request queue to unplug
 *
 * Unplug request queue @q because device driver is scheduled to work
 * on elements in the request queue.
 */
DEFINE_EVENT(block_unplug, block_unplug_io,

        TP_PROTO(struct request_queue *q),

        TP_ARGS(q)
);

/**
 * block_split - split a single bio struct into two bio structs
 * @q: queue containing the bio
 * @bio: block operation being split
 * @new_sector: The starting sector for the new bio
 *
 * The bio request @bio in request queue @q needs to be split into two
 * bio requests. The newly created @bio request starts at
 * @new_sector. This split may be required due to hardware limitation
 * such as operation crossing device boundaries in a RAID system.
 */
TRACE_EVENT(block_split,

        TP_PROTO(struct request_queue *q, struct bio *bio,
                 unsigned int new_sector),

        TP_ARGS(q, bio, new_sector),

        TP_STRUCT__entry(
                __field( dev_t,         dev                             )
                __field( sector_t,      sector                          )
                __field( sector_t,      new_sector                      )
                __array( char,          rwbs,           6               )
                __array( char,          comm,           TASK_COMM_LEN   )
        ),

        TP_fast_assign(
                __entry->dev            = bio->bi_bdev->bd_dev;
                __entry->sector         = bio->bi_sector;
                __entry->new_sector     = new_sector;
                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 / %llu [%s]",
                  MAJOR(__entry->dev), MINOR(__entry->dev), __entry->rwbs,
                  (unsigned long long)__entry->sector,
                  (unsigned long long)__entry->new_sector,
                  __entry->comm)
);

/**
 * block_remap - map request for a partition to the raw device
 * @q: queue holding the operation
 * @bio: revised operation
 * @dev: device for the operation
 * @from: original sector for the operation
 *
 * An operation for a partition on a block device has been mapped to the
 * raw block device.
 */
TRACE_EVENT(block_remap,

        TP_PROTO(struct request_queue *q, struct bio *bio, dev_t dev,
                 sector_t from),

        TP_ARGS(q, bio, dev, from),

        TP_STRUCT__entry(
                __field( dev_t,         dev             )
                __field( sector_t,      sector          )
                __field( unsigned int,  nr_sector       )
                __field( dev_t,         old_dev         )
                __field( sector_t,      old_sector      )
                __array( char,          rwbs,   6       )
        ),

        TP_fast_assign(
                __entry->dev            = bio->bi_bdev->bd_dev;
                __entry->sector         = bio->bi_sector;
                __entry->nr_sector      = bio->bi_size >> 9;
                __entry->old_dev        = dev;
                __entry->old_sector     = from;
                blk_fill_rwbs(__entry->rwbs, bio->bi_rw, bio->bi_size);
        ),

        TP_printk("%d,%d %s %llu + %u <- (%d,%d) %llu",
                  MAJOR(__entry->dev), MINOR(__entry->dev), __entry->rwbs,
                  (unsigned long long)__entry->sector,
                  __entry->nr_sector,
                  MAJOR(__entry->old_dev), MINOR(__entry->old_dev),
                  (unsigned long long)__entry->old_sector)
);

/**
 * block_rq_remap - map request for a block operation request
 * @q: queue holding the operation
 * @rq: block IO operation request
 * @dev: device for the operation
 * @from: original sector for the operation
 *
 * The block operation request @rq in @q has been remapped.  The block
 * operation request @rq holds the current information and @from hold
 * the original sector.
 */
TRACE_EVENT(block_rq_remap,

        TP_PROTO(struct request_queue *q, struct request *rq, dev_t dev,
                 sector_t from),

        TP_ARGS(q, rq, dev, from),

        TP_STRUCT__entry(
                __field( dev_t,         dev             )
                __field( sector_t,      sector          )
                __field( unsigned int,  nr_sector       )
                __field( dev_t,         old_dev         )
                __field( sector_t,      old_sector      )
                __array( char,          rwbs,   6       )
        ),

        TP_fast_assign(
                __entry->dev            = disk_devt(rq->rq_disk);
                __entry->sector         = blk_rq_pos(rq);
                __entry->nr_sector      = blk_rq_sectors(rq);
                __entry->old_dev        = dev;
                __entry->old_sector     = from;
                blk_fill_rwbs_rq(__entry->rwbs, rq);
        ),

        TP_printk("%d,%d %s %llu + %u <- (%d,%d) %llu",
                  MAJOR(__entry->dev), MINOR(__entry->dev), __entry->rwbs,
                  (unsigned long long)__entry->sector,
                  __entry->nr_sector,
                  MAJOR(__entry->old_dev), MINOR(__entry->old_dev),
                  (unsigned long long)__entry->old_sector)
);

#endif /* _TRACE_BLOCK_H */

/* This part must be outside protection */
#include <trace/define_trace.h>