From 48b77ad6084481ef9330a5d2bee289966da0975b Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Fri, 27 Jan 2017 09:35:54 +0100 Subject: [PATCH] block: cleanup tracing A couple tweaks to the tracing code: - trace the request size for all requests - trace request sector and nr_sectors only for fs requests, enforced by helpers - drop SCSI CDB tracing - we have SCSI tracing for this and are going to me the CDB out of the generic struct request soon. With this the tracing code stops to know about BLOCK_PC requests entirely, it's just FS vs passthrough requests now, where the latter includes any driver-private requests. Signed-off-by: Christoph Hellwig Signed-off-by: Jens Axboe --- include/linux/blktrace_api.h | 18 +++++++-------- include/trace/events/block.h | 27 +++++++++------------- kernel/trace/blktrace.c | 43 +++++------------------------------- 3 files changed, 26 insertions(+), 62 deletions(-) diff --git a/include/linux/blktrace_api.h b/include/linux/blktrace_api.h index e417f080219a..a143a67a6f33 100644 --- a/include/linux/blktrace_api.h +++ b/include/linux/blktrace_api.h @@ -110,16 +110,16 @@ struct compat_blk_user_trace_setup { #endif -#if defined(CONFIG_EVENT_TRACING) && defined(CONFIG_BLOCK) - -static inline int blk_cmd_buf_len(struct request *rq) -{ - return (rq->cmd_type == REQ_TYPE_BLOCK_PC) ? rq->cmd_len * 3 : 1; -} - -extern void blk_dump_cmd(char *buf, struct request *rq); extern void blk_fill_rwbs(char *rwbs, unsigned int op, int bytes); -#endif /* CONFIG_EVENT_TRACING && CONFIG_BLOCK */ +static inline sector_t blk_rq_trace_sector(struct request *rq) +{ + return (rq->cmd_type != REQ_TYPE_FS) ? 0 : blk_rq_pos(rq); +} + +static inline unsigned int blk_rq_trace_nr_sectors(struct request *rq) +{ + return (rq->cmd_type != REQ_TYPE_FS) ? 0 : blk_rq_sectors(rq); +} #endif diff --git a/include/trace/events/block.h b/include/trace/events/block.h index 3e02e3a25413..a88ed13446ff 100644 --- a/include/trace/events/block.h +++ b/include/trace/events/block.h @@ -73,19 +73,17 @@ DECLARE_EVENT_CLASS(block_rq_with_error, __field( unsigned int, nr_sector ) __field( int, errors ) __array( char, rwbs, RWBS_LEN ) - __dynamic_array( char, cmd, blk_cmd_buf_len(rq) ) + __dynamic_array( char, cmd, 1 ) ), TP_fast_assign( __entry->dev = rq->rq_disk ? disk_devt(rq->rq_disk) : 0; - __entry->sector = (rq->cmd_type == REQ_TYPE_BLOCK_PC) ? - 0 : blk_rq_pos(rq); - __entry->nr_sector = (rq->cmd_type == REQ_TYPE_BLOCK_PC) ? - 0 : blk_rq_sectors(rq); + __entry->sector = blk_rq_trace_sector(rq); + __entry->nr_sector = blk_rq_trace_nr_sectors(rq); __entry->errors = rq->errors; blk_fill_rwbs(__entry->rwbs, rq->cmd_flags, blk_rq_bytes(rq)); - blk_dump_cmd(__get_str(cmd), rq); + __get_str(cmd)[0] = '\0'; ), TP_printk("%d,%d %s (%s) %llu + %u [%d]", @@ -153,7 +151,7 @@ TRACE_EVENT(block_rq_complete, __field( unsigned int, nr_sector ) __field( int, errors ) __array( char, rwbs, RWBS_LEN ) - __dynamic_array( char, cmd, blk_cmd_buf_len(rq) ) + __dynamic_array( char, cmd, 1 ) ), TP_fast_assign( @@ -163,7 +161,7 @@ TRACE_EVENT(block_rq_complete, __entry->errors = rq->errors; blk_fill_rwbs(__entry->rwbs, rq->cmd_flags, nr_bytes); - blk_dump_cmd(__get_str(cmd), rq); + __get_str(cmd)[0] = '\0'; ), TP_printk("%d,%d %s (%s) %llu + %u [%d]", @@ -186,20 +184,17 @@ DECLARE_EVENT_CLASS(block_rq, __field( unsigned int, bytes ) __array( char, rwbs, RWBS_LEN ) __array( char, comm, TASK_COMM_LEN ) - __dynamic_array( char, cmd, blk_cmd_buf_len(rq) ) + __dynamic_array( char, cmd, 1 ) ), TP_fast_assign( __entry->dev = rq->rq_disk ? disk_devt(rq->rq_disk) : 0; - __entry->sector = (rq->cmd_type == REQ_TYPE_BLOCK_PC) ? - 0 : blk_rq_pos(rq); - __entry->nr_sector = (rq->cmd_type == REQ_TYPE_BLOCK_PC) ? - 0 : blk_rq_sectors(rq); - __entry->bytes = (rq->cmd_type == REQ_TYPE_BLOCK_PC) ? - blk_rq_bytes(rq) : 0; + __entry->sector = blk_rq_trace_sector(rq); + __entry->nr_sector = blk_rq_trace_nr_sectors(rq); + __entry->bytes = blk_rq_bytes(rq); blk_fill_rwbs(__entry->rwbs, rq->cmd_flags, blk_rq_bytes(rq)); - blk_dump_cmd(__get_str(cmd), rq); + __get_str(cmd)[0] = '\0'; memcpy(__entry->comm, current->comm, TASK_COMM_LEN); ), diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c index 95cecbf67f5c..512b34703ac3 100644 --- a/kernel/trace/blktrace.c +++ b/kernel/trace/blktrace.c @@ -712,15 +712,13 @@ static void blk_add_trace_rq(struct request_queue *q, struct request *rq, if (likely(!bt)) return; - if (rq->cmd_type == REQ_TYPE_BLOCK_PC) { + if (rq->cmd_type != REQ_TYPE_FS) what |= BLK_TC_ACT(BLK_TC_PC); - __blk_add_trace(bt, 0, nr_bytes, req_op(rq), rq->cmd_flags, - what, rq->errors, rq->cmd_len, rq->cmd); - } else { + else what |= BLK_TC_ACT(BLK_TC_FS); - __blk_add_trace(bt, blk_rq_pos(rq), nr_bytes, req_op(rq), - rq->cmd_flags, what, rq->errors, 0, NULL); - } + + __blk_add_trace(bt, blk_rq_trace_sector(rq), nr_bytes, req_op(rq), + rq->cmd_flags, what, rq->errors, 0, NULL); } static void blk_add_trace_rq_abort(void *ignore, @@ -972,11 +970,7 @@ void blk_add_driver_data(struct request_queue *q, if (likely(!bt)) return; - if (rq->cmd_type == REQ_TYPE_BLOCK_PC) - __blk_add_trace(bt, 0, blk_rq_bytes(rq), 0, 0, - BLK_TA_DRV_DATA, rq->errors, len, data); - else - __blk_add_trace(bt, blk_rq_pos(rq), blk_rq_bytes(rq), 0, 0, + __blk_add_trace(bt, blk_rq_trace_sector(rq), blk_rq_bytes(rq), 0, 0, BLK_TA_DRV_DATA, rq->errors, len, data); } EXPORT_SYMBOL_GPL(blk_add_driver_data); @@ -1752,31 +1746,6 @@ void blk_trace_remove_sysfs(struct device *dev) #ifdef CONFIG_EVENT_TRACING -void blk_dump_cmd(char *buf, struct request *rq) -{ - int i, end; - int len = rq->cmd_len; - unsigned char *cmd = rq->cmd; - - if (rq->cmd_type != REQ_TYPE_BLOCK_PC) { - buf[0] = '\0'; - return; - } - - for (end = len - 1; end >= 0; end--) - if (cmd[end]) - break; - end++; - - for (i = 0; i < len; i++) { - buf += sprintf(buf, "%s%02x", i == 0 ? "" : " ", cmd[i]); - if (i == end && end != len - 1) { - sprintf(buf, " .."); - break; - } - } -} - void blk_fill_rwbs(char *rwbs, unsigned int op, int bytes) { int i = 0;