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tracing/events: convert block trace points to TRACE_EVENT()
TRACE_EVENT is a more generic way to define tracepoints. Doing so adds
these new capabilities to this tracepoint:
- zero-copy and per-cpu splice() tracing
- binary tracing without printf overhead
- structured logging records exposed under /debug/tracing/events
- trace events embedded in function tracer output and other plugins
- user-defined, per tracepoint filter expressions
...
Cons:
- no dev_t info for the output of plug, unplug_timer and unplug_io events.
no dev_t info for getrq and sleeprq events if bio == NULL.
no dev_t info for rq_abort,...,rq_requeue events if rq->rq_disk == NULL.
This is mainly because we can't get the deivce from a request queue.
But this may change in the future.
- A packet command is converted to a string in TP_assign, not TP_print.
While blktrace do the convertion just before output.
Since pc requests should be rather rare, this is not a big issue.
- In blktrace, an event can have 2 different print formats, but a TRACE_EVENT
has a unique format, which means we have some unused data in a trace entry.
The overhead is minimized by using __dynamic_array() instead of __array().
I've benchmarked the ioctl blktrace vs the splice based TRACE_EVENT tracing:
dd dd + ioctl blktrace dd + TRACE_EVENT (splice)
1 7.36s, 42.7 MB/s 7.50s, 42.0 MB/s 7.41s, 42.5 MB/s
2 7.43s, 42.3 MB/s 7.48s, 42.1 MB/s 7.43s, 42.4 MB/s
3 7.38s, 42.6 MB/s 7.45s, 42.2 MB/s 7.41s, 42.5 MB/s
So the overhead of tracing is very small, and no regression when using
those trace events vs blktrace.
And the binary output of TRACE_EVENT is much smaller than blktrace:
# ls -l -h
-rw-r--r-- 1 root root 8.8M 06-09 13:24 sda.blktrace.0
-rw-r--r-- 1 root root 195K 06-09 13:24 sda.blktrace.1
-rw-r--r-- 1 root root 2.7M 06-09 13:25 trace_splice.out
Following are some comparisons between TRACE_EVENT and blktrace:
plug:
kjournald-480 [000] 303.084981: block_plug: [kjournald]
kjournald-480 [000] 303.084981: 8,0 P N [kjournald]
unplug_io:
kblockd/0-118 [000] 300.052973: block_unplug_io: [kblockd/0] 1
kblockd/0-118 [000] 300.052974: 8,0 U N [kblockd/0] 1
remap:
kjournald-480 [000] 303.085042: block_remap: 8,0 W 102736992 + 8 <- (8,8) 33384
kjournald-480 [000] 303.085043: 8,0 A W 102736992 + 8 <- (8,8) 33384
bio_backmerge:
kjournald-480 [000] 303.085086: block_bio_backmerge: 8,0 W 102737032 + 8 [kjournald]
kjournald-480 [000] 303.085086: 8,0 M W 102737032 + 8 [kjournald]
getrq:
kjournald-480 [000] 303.084974: block_getrq: 8,0 W 102736984 + 8 [kjournald]
kjournald-480 [000] 303.084975: 8,0 G W 102736984 + 8 [kjournald]
bash-2066 [001] 1072.953770: 8,0 G N [bash]
bash-2066 [001] 1072.953773: block_getrq: 0,0 N 0 + 0 [bash]
rq_complete:
konsole-2065 [001] 300.053184: block_rq_complete: 8,0 W () 103669040 + 16 [0]
konsole-2065 [001] 300.053191: 8,0 C W 103669040 + 16 [0]
ksoftirqd/1-7 [001] 1072.953811: 8,0 C N (5a 00 08 00 00 00 00 00 24 00) [0]
ksoftirqd/1-7 [001] 1072.953813: block_rq_complete: 0,0 N (5a 00 08 00 00 00 00 00 24 00) 0 + 0 [0]
rq_insert:
kjournald-480 [000] 303.084985: block_rq_insert: 8,0 W 0 () 102736984 + 8 [kjournald]
kjournald-480 [000] 303.084986: 8,0 I W 102736984 + 8 [kjournald]
Changelog from v2 -> v3:
- use the newly introduced __dynamic_array().
Changelog from v1 -> v2:
- use __string() instead of __array() to minimize the memory required
to store hex dump of rq->cmd().
- support large pc requests.
- add missing blk_fill_rwbs_rq() in block_rq_requeue TRACE_EVENT.
- some cleanups.
Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
LKML-Reference: <4A2DF669.5070905@cn.fujitsu.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Li Zefan
Steven Rostedt
parent
f57a8a1911
commit
55782138e4
@ -28,22 +28,14 @@
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#include <linux/task_io_accounting_ops.h>
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#include <linux/blktrace_api.h>
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#include <linux/fault-inject.h>
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#include <trace/block.h>
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#define CREATE_TRACE_POINTS
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#include <trace/events/block.h>
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#include "blk.h"
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DEFINE_TRACE(block_plug);
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DEFINE_TRACE(block_unplug_io);
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DEFINE_TRACE(block_unplug_timer);
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DEFINE_TRACE(block_getrq);
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DEFINE_TRACE(block_sleeprq);
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DEFINE_TRACE(block_rq_requeue);
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DEFINE_TRACE(block_bio_backmerge);
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DEFINE_TRACE(block_bio_frontmerge);
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DEFINE_TRACE(block_bio_queue);
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DEFINE_TRACE(block_rq_complete);
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DEFINE_TRACE(block_remap); /* Also used in drivers/md/dm.c */
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EXPORT_TRACEPOINT_SYMBOL_GPL(block_remap);
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EXPORT_TRACEPOINT_SYMBOL_GPL(block_bio_complete);
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static int __make_request(struct request_queue *q, struct bio *bio);
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@ -33,17 +33,16 @@
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#include <linux/compiler.h>
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#include <linux/delay.h>
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#include <linux/blktrace_api.h>
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#include <trace/block.h>
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#include <linux/hash.h>
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#include <linux/uaccess.h>
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#include <trace/events/block.h>
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#include "blk.h"
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static DEFINE_SPINLOCK(elv_list_lock);
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static LIST_HEAD(elv_list);
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DEFINE_TRACE(block_rq_abort);
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/*
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* Merge hash stuff.
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*/
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@ -55,9 +54,6 @@ static const int elv_hash_shift = 6;
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#define rq_hash_key(rq) ((rq)->sector + (rq)->nr_sectors)
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#define ELV_ON_HASH(rq) (!hlist_unhashed(&(rq)->hash))
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DEFINE_TRACE(block_rq_insert);
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DEFINE_TRACE(block_rq_issue);
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/*
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* Query io scheduler to see if the current process issuing bio may be
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* merged with rq.
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@ -20,7 +20,8 @@
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#include <linux/idr.h>
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#include <linux/hdreg.h>
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#include <linux/blktrace_api.h>
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#include <trace/block.h>
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#include <trace/events/block.h>
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#define DM_MSG_PREFIX "core"
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@ -53,8 +54,6 @@ struct dm_target_io {
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union map_info info;
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};
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DEFINE_TRACE(block_bio_complete);
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/*
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* For request-based dm.
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* One of these is allocated per request.
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3
fs/bio.c
3
fs/bio.c
@ -26,10 +26,9 @@
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#include <linux/mempool.h>
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#include <linux/workqueue.h>
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#include <linux/blktrace_api.h>
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#include <trace/block.h>
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#include <scsi/sg.h> /* for struct sg_iovec */
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DEFINE_TRACE(block_split);
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#include <trace/events/block.h>
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/*
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* Test patch to inline a certain number of bi_io_vec's inside the bio
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@ -218,5 +218,18 @@ static inline int blk_trace_init_sysfs(struct device *dev)
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#endif /* CONFIG_BLK_DEV_IO_TRACE */
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#ifdef CONFIG_EVENT_TRACING
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static inline int blk_cmd_buf_len(struct request *rq)
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{
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return blk_pc_request(rq) ? rq->cmd_len * 3 : 1;
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}
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extern void blk_dump_cmd(char *buf, struct request *rq);
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extern void blk_fill_rwbs(char *rwbs, u32 rw, int bytes);
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extern void blk_fill_rwbs_rq(char *rwbs, struct request *rq);
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#endif /* CONFIG_EVENT_TRACING */
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#endif /* __KERNEL__ */
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#endif
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@ -1,76 +0,0 @@
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#ifndef _TRACE_BLOCK_H
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#define _TRACE_BLOCK_H
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#include <linux/blkdev.h>
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#include <linux/tracepoint.h>
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DECLARE_TRACE(block_rq_abort,
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TP_PROTO(struct request_queue *q, struct request *rq),
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TP_ARGS(q, rq));
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DECLARE_TRACE(block_rq_insert,
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TP_PROTO(struct request_queue *q, struct request *rq),
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TP_ARGS(q, rq));
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DECLARE_TRACE(block_rq_issue,
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TP_PROTO(struct request_queue *q, struct request *rq),
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TP_ARGS(q, rq));
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DECLARE_TRACE(block_rq_requeue,
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TP_PROTO(struct request_queue *q, struct request *rq),
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TP_ARGS(q, rq));
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DECLARE_TRACE(block_rq_complete,
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TP_PROTO(struct request_queue *q, struct request *rq),
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TP_ARGS(q, rq));
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DECLARE_TRACE(block_bio_bounce,
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TP_PROTO(struct request_queue *q, struct bio *bio),
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TP_ARGS(q, bio));
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DECLARE_TRACE(block_bio_complete,
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TP_PROTO(struct request_queue *q, struct bio *bio),
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TP_ARGS(q, bio));
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DECLARE_TRACE(block_bio_backmerge,
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TP_PROTO(struct request_queue *q, struct bio *bio),
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TP_ARGS(q, bio));
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DECLARE_TRACE(block_bio_frontmerge,
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TP_PROTO(struct request_queue *q, struct bio *bio),
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TP_ARGS(q, bio));
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DECLARE_TRACE(block_bio_queue,
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TP_PROTO(struct request_queue *q, struct bio *bio),
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TP_ARGS(q, bio));
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DECLARE_TRACE(block_getrq,
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TP_PROTO(struct request_queue *q, struct bio *bio, int rw),
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TP_ARGS(q, bio, rw));
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DECLARE_TRACE(block_sleeprq,
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TP_PROTO(struct request_queue *q, struct bio *bio, int rw),
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TP_ARGS(q, bio, rw));
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DECLARE_TRACE(block_plug,
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TP_PROTO(struct request_queue *q),
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TP_ARGS(q));
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DECLARE_TRACE(block_unplug_timer,
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TP_PROTO(struct request_queue *q),
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TP_ARGS(q));
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DECLARE_TRACE(block_unplug_io,
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TP_PROTO(struct request_queue *q),
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TP_ARGS(q));
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DECLARE_TRACE(block_split,
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TP_PROTO(struct request_queue *q, struct bio *bio, unsigned int pdu),
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TP_ARGS(q, bio, pdu));
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DECLARE_TRACE(block_remap,
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TP_PROTO(struct request_queue *q, struct bio *bio, dev_t dev,
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sector_t from),
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TP_ARGS(q, bio, dev, from));
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#endif
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483
include/trace/events/block.h
Normal file
483
include/trace/events/block.h
Normal file
@ -0,0 +1,483 @@
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#if !defined(_TRACE_BLOCK_H) || defined(TRACE_HEADER_MULTI_READ)
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#define _TRACE_BLOCK_H
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#include <linux/blktrace_api.h>
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#include <linux/blkdev.h>
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#include <linux/tracepoint.h>
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#undef TRACE_SYSTEM
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#define TRACE_SYSTEM block
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TRACE_EVENT(block_rq_abort,
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TP_PROTO(struct request_queue *q, struct request *rq),
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TP_ARGS(q, rq),
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TP_STRUCT__entry(
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__field( dev_t, dev )
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__field( sector_t, sector )
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__field( unsigned int, nr_sector )
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__field( int, errors )
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__array( char, rwbs, 6 )
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__dynamic_array( char, cmd, blk_cmd_buf_len(rq) )
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),
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TP_fast_assign(
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__entry->dev = rq->rq_disk ? disk_devt(rq->rq_disk) : 0;
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__entry->sector = blk_pc_request(rq) ? 0 : rq->hard_sector;
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__entry->nr_sector = blk_pc_request(rq) ?
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0 : rq->hard_nr_sectors;
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__entry->errors = rq->errors;
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blk_fill_rwbs_rq(__entry->rwbs, rq);
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blk_dump_cmd(__get_str(cmd), rq);
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),
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TP_printk("%d,%d %s (%s) %llu + %u [%d]",
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MAJOR(__entry->dev), MINOR(__entry->dev),
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__entry->rwbs, __get_str(cmd),
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__entry->sector, __entry->nr_sector, __entry->errors)
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);
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TRACE_EVENT(block_rq_insert,
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TP_PROTO(struct request_queue *q, struct request *rq),
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TP_ARGS(q, rq),
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TP_STRUCT__entry(
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__field( dev_t, dev )
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__field( sector_t, sector )
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__field( unsigned int, nr_sector )
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__field( unsigned int, bytes )
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__array( char, rwbs, 6 )
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__array( char, comm, TASK_COMM_LEN )
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__dynamic_array( char, cmd, blk_cmd_buf_len(rq) )
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),
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TP_fast_assign(
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__entry->dev = rq->rq_disk ? disk_devt(rq->rq_disk) : 0;
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__entry->sector = blk_pc_request(rq) ? 0 : rq->hard_sector;
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__entry->nr_sector = blk_pc_request(rq) ?
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0 : rq->hard_nr_sectors;
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__entry->bytes = blk_pc_request(rq) ? rq->data_len : 0;
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blk_fill_rwbs_rq(__entry->rwbs, rq);
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blk_dump_cmd(__get_str(cmd), rq);
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memcpy(__entry->comm, current->comm, TASK_COMM_LEN);
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),
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TP_printk("%d,%d %s %u (%s) %llu + %u [%s]",
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MAJOR(__entry->dev), MINOR(__entry->dev),
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__entry->rwbs, __entry->bytes, __get_str(cmd),
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__entry->sector, __entry->nr_sector, __entry->comm)
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);
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TRACE_EVENT(block_rq_issue,
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TP_PROTO(struct request_queue *q, struct request *rq),
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TP_ARGS(q, rq),
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TP_STRUCT__entry(
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__field( dev_t, dev )
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__field( sector_t, sector )
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__field( unsigned int, nr_sector )
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__field( unsigned int, bytes )
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__array( char, rwbs, 6 )
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__array( char, comm, TASK_COMM_LEN )
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__dynamic_array( char, cmd, blk_cmd_buf_len(rq) )
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),
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TP_fast_assign(
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__entry->dev = rq->rq_disk ? disk_devt(rq->rq_disk) : 0;
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__entry->sector = blk_pc_request(rq) ? 0 : rq->hard_sector;
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__entry->nr_sector = blk_pc_request(rq) ?
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0 : rq->hard_nr_sectors;
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__entry->bytes = blk_pc_request(rq) ? rq->data_len : 0;
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blk_fill_rwbs_rq(__entry->rwbs, rq);
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blk_dump_cmd(__get_str(cmd), rq);
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memcpy(__entry->comm, current->comm, TASK_COMM_LEN);
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),
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TP_printk("%d,%d %s %u (%s) %llu + %u [%s]",
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MAJOR(__entry->dev), MINOR(__entry->dev),
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__entry->rwbs, __entry->bytes, __get_str(cmd),
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__entry->sector, __entry->nr_sector, __entry->comm)
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);
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TRACE_EVENT(block_rq_requeue,
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TP_PROTO(struct request_queue *q, struct request *rq),
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TP_ARGS(q, rq),
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TP_STRUCT__entry(
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__field( dev_t, dev )
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__field( sector_t, sector )
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__field( unsigned int, nr_sector )
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__field( int, errors )
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__array( char, rwbs, 6 )
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__dynamic_array( char, cmd, blk_cmd_buf_len(rq) )
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),
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TP_fast_assign(
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__entry->dev = rq->rq_disk ? disk_devt(rq->rq_disk) : 0;
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__entry->sector = blk_pc_request(rq) ? 0 : rq->hard_sector;
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__entry->nr_sector = blk_pc_request(rq) ?
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0 : rq->hard_nr_sectors;
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__entry->errors = rq->errors;
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blk_fill_rwbs_rq(__entry->rwbs, rq);
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blk_dump_cmd(__get_str(cmd), rq);
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),
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TP_printk("%d,%d %s (%s) %llu + %u [%d]",
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MAJOR(__entry->dev), MINOR(__entry->dev),
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__entry->rwbs, __get_str(cmd),
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__entry->sector, __entry->nr_sector, __entry->errors)
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);
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TRACE_EVENT(block_rq_complete,
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TP_PROTO(struct request_queue *q, struct request *rq),
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TP_ARGS(q, rq),
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TP_STRUCT__entry(
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__field( dev_t, dev )
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__field( sector_t, sector )
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__field( unsigned int, nr_sector )
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__field( int, errors )
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__array( char, rwbs, 6 )
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__dynamic_array( char, cmd, blk_cmd_buf_len(rq) )
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),
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TP_fast_assign(
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__entry->dev = rq->rq_disk ? disk_devt(rq->rq_disk) : 0;
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__entry->sector = blk_pc_request(rq) ? 0 : rq->hard_sector;
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__entry->nr_sector = blk_pc_request(rq) ?
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0 : rq->hard_nr_sectors;
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__entry->errors = rq->errors;
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blk_fill_rwbs_rq(__entry->rwbs, rq);
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blk_dump_cmd(__get_str(cmd), rq);
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),
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TP_printk("%d,%d %s (%s) %llu + %u [%d]",
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MAJOR(__entry->dev), MINOR(__entry->dev),
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__entry->rwbs, __get_str(cmd),
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__entry->sector, __entry->nr_sector, __entry->errors)
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);
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TRACE_EVENT(block_bio_bounce,
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TP_PROTO(struct request_queue *q, struct bio *bio),
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TP_ARGS(q, bio),
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TP_STRUCT__entry(
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__field( dev_t, dev )
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__field( sector_t, sector )
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__field( unsigned int, nr_sector )
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__array( char, rwbs, 6 )
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__array( char, comm, TASK_COMM_LEN )
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),
|
||||
|
||||
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,
|
||||
__entry->sector, __entry->nr_sector, __entry->comm)
|
||||
);
|
||||
|
||||
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,
|
||||
__entry->sector, __entry->nr_sector, __entry->error)
|
||||
);
|
||||
|
||||
TRACE_EVENT(block_bio_backmerge,
|
||||
|
||||
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,
|
||||
__entry->sector, __entry->nr_sector, __entry->comm)
|
||||
);
|
||||
|
||||
TRACE_EVENT(block_bio_frontmerge,
|
||||
|
||||
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 )
|
||||
__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,
|
||||
__entry->sector, __entry->nr_sector, __entry->comm)
|
||||
);
|
||||
|
||||
TRACE_EVENT(block_bio_queue,
|
||||
|
||||
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,
|
||||
__entry->sector, __entry->nr_sector, __entry->comm)
|
||||
);
|
||||
|
||||
TRACE_EVENT(block_getrq,
|
||||
|
||||
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,
|
||||
__entry->sector, __entry->nr_sector, __entry->comm)
|
||||
);
|
||||
|
||||
TRACE_EVENT(block_sleeprq,
|
||||
|
||||
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,
|
||||
__entry->sector, __entry->nr_sector, __entry->comm)
|
||||
);
|
||||
|
||||
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)
|
||||
);
|
||||
|
||||
TRACE_EVENT(block_unplug_timer,
|
||||
|
||||
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)
|
||||
);
|
||||
|
||||
TRACE_EVENT(block_unplug_io,
|
||||
|
||||
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)
|
||||
);
|
||||
|
||||
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,
|
||||
__entry->sector, __entry->new_sector, __entry->comm)
|
||||
);
|
||||
|
||||
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,
|
||||
__entry->sector, __entry->nr_sector,
|
||||
MAJOR(__entry->old_dev), MINOR(__entry->old_dev),
|
||||
__entry->old_sector)
|
||||
);
|
||||
|
||||
#endif /* _TRACE_BLOCK_H */
|
||||
|
||||
/* This part must be outside protection */
|
||||
#include <trace/define_trace.h>
|
||||
|
||||
@ -45,7 +45,10 @@ obj-$(CONFIG_HW_BRANCH_TRACER) += trace_hw_branches.o
|
||||
obj-$(CONFIG_POWER_TRACER) += trace_power.o
|
||||
obj-$(CONFIG_KMEMTRACE) += kmemtrace.o
|
||||
obj-$(CONFIG_WORKQUEUE_TRACER) += trace_workqueue.o
|
||||
obj-$(CONFIG_BLK_DEV_IO_TRACE) += blktrace.o
|
||||
obj-$(CONFIG_BLK_DEV_IO_TRACE) += blktrace.o
|
||||
ifeq ($(CONFIG_BLOCK),y)
|
||||
obj-$(CONFIG_EVENT_TRACING) += blktrace.o
|
||||
endif
|
||||
obj-$(CONFIG_EVENT_TRACING) += trace_events.o
|
||||
obj-$(CONFIG_EVENT_TRACING) += trace_export.o
|
||||
obj-$(CONFIG_FTRACE_SYSCALLS) += trace_syscalls.o
|
||||
|
||||
@ -23,10 +23,14 @@
|
||||
#include <linux/mutex.h>
|
||||
#include <linux/debugfs.h>
|
||||
#include <linux/time.h>
|
||||
#include <trace/block.h>
|
||||
#include <linux/uaccess.h>
|
||||
|
||||
#include <trace/events/block.h>
|
||||
|
||||
#include "trace_output.h"
|
||||
|
||||
#ifdef CONFIG_BLK_DEV_IO_TRACE
|
||||
|
||||
static unsigned int blktrace_seq __read_mostly = 1;
|
||||
|
||||
static struct trace_array *blk_tr;
|
||||
@ -1658,3 +1662,75 @@ int blk_trace_init_sysfs(struct device *dev)
|
||||
return sysfs_create_group(&dev->kobj, &blk_trace_attr_group);
|
||||
}
|
||||
|
||||
#endif /* CONFIG_BLK_DEV_IO_TRACE */
|
||||
|
||||
#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 (!blk_pc_request(rq)) {
|
||||
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, u32 rw, int bytes)
|
||||
{
|
||||
int i = 0;
|
||||
|
||||
if (rw & WRITE)
|
||||
rwbs[i++] = 'W';
|
||||
else if (rw & 1 << BIO_RW_DISCARD)
|
||||
rwbs[i++] = 'D';
|
||||
else if (bytes)
|
||||
rwbs[i++] = 'R';
|
||||
else
|
||||
rwbs[i++] = 'N';
|
||||
|
||||
if (rw & 1 << BIO_RW_AHEAD)
|
||||
rwbs[i++] = 'A';
|
||||
if (rw & 1 << BIO_RW_BARRIER)
|
||||
rwbs[i++] = 'B';
|
||||
if (rw & 1 << BIO_RW_SYNCIO)
|
||||
rwbs[i++] = 'S';
|
||||
if (rw & 1 << BIO_RW_META)
|
||||
rwbs[i++] = 'M';
|
||||
|
||||
rwbs[i] = '\0';
|
||||
}
|
||||
|
||||
void blk_fill_rwbs_rq(char *rwbs, struct request *rq)
|
||||
{
|
||||
int rw = rq->cmd_flags & 0x03;
|
||||
int bytes;
|
||||
|
||||
if (blk_discard_rq(rq))
|
||||
rw |= (1 << BIO_RW_DISCARD);
|
||||
|
||||
if (blk_pc_request(rq))
|
||||
bytes = rq->data_len;
|
||||
else
|
||||
bytes = rq->hard_nr_sectors << 9;
|
||||
|
||||
blk_fill_rwbs(rwbs, rw, bytes);
|
||||
}
|
||||
|
||||
#endif /* CONFIG_EVENT_TRACING */
|
||||
|
||||
|
||||
@ -14,16 +14,15 @@
|
||||
#include <linux/hash.h>
|
||||
#include <linux/highmem.h>
|
||||
#include <linux/blktrace_api.h>
|
||||
#include <trace/block.h>
|
||||
#include <asm/tlbflush.h>
|
||||
|
||||
#include <trace/events/block.h>
|
||||
|
||||
#define POOL_SIZE 64
|
||||
#define ISA_POOL_SIZE 16
|
||||
|
||||
static mempool_t *page_pool, *isa_page_pool;
|
||||
|
||||
DEFINE_TRACE(block_bio_bounce);
|
||||
|
||||
#ifdef CONFIG_HIGHMEM
|
||||
static __init int init_emergency_pool(void)
|
||||
{
|
||||
|
||||
Loading…
Reference in New Issue
Block a user