1. Article purpose[edit source]
This article provides the basic information needed to start using the Linux® tool: blktrace[1] (block tracer).
2. Introduction[edit source]
The following table provides a brief description of the tool, as well as its availability depending on the software packages:
: this tool is either present (ready to use or to be activated), or can be integrated and activated on the software package.
: this tool is not present and cannot be integrated, or it is present but cannot be activated on the software package.
| Tool | STM32MPU Embedded Software distribution | STM32MPU Embedded Softwaredistribution for Android™ | ||||||
|---|---|---|---|---|---|---|---|---|
| Name | Category | Purpose | Starter Package | Developer Package | Distribution Package | Starter Package | Developer Package | Distribution Package |
| blktrace | Tracing tools | blktrace[1] generates traces of the I/O traffic on block devices (SD card, USB, eMMC...) | |
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The blktrace tool is composed of three main components:
- a kernel
- a utility to record the I/O trace information from the kernel on the user space
- utilities to analyze and view the trace information.
blkparse[2] is also associated to blktrace. It takes the raw output from the blktrace utility and converts it to a nicely formatted and easy-to-read form.
3. Installing the trace and debug tool on your target board[edit source]
It consists of placing the blktrace binary in the rootfs, and modifying the Linux kernel configuration.
In order to use blktrace, the Linux kernel configuration must activate CONFIG_BLK_DEV_IO_TRACE using the Linux kernel menuconfig tool:
Symbol: BLK_DEV_IO_TRACE Location: Kernel Hacking ---> [*] Tracers ---> [*] Support for tracing block I/O actions
3.1. Using the STM32MPU Embedded Software distribution[edit source]
The blktrace binary is available by default in all STM32MPU Embedded Software Packages:
which blktrace /usr/bin/blktrace
It is integrated in weston image distribution through openembedded-core package: openembedded-core/meta/recipes-core/packagegroups/packagegroup-core-tools-profile.bb.
RRECOMMENDS_${PN} = "\
${PERF} \
trace-cmd \
blktrace \
${PROFILE_TOOLS_X} \
${PROFILE_TOOLS_SYSTEMD} \
"
3.1.1. Starter Package[edit source]
Not applicable as Linux kernel configuration cannot be updated.
3.1.2. Developer Package[edit source]
To enable CONFIG_BLK_DEV_IO_TRACE in Linux kernel configuration, please refer to the Menuconfig or how to configure kernel. This article provides instructions for modifying the configuration and recompiling the Linux kernel image in the Developer Package context.
3.1.3. Distribution Package[edit source]
To enable CONFIG_BLK_DEV_IO_TRACE in Linux® kernel configuration, please refer to the Menuconfig or how to configure kernel. This article provides instructions for modifying the configuration and recompiling the Linux kernel image in the Distribution Package context.
3.2. Using the STM32MPU Embedded software for Android™[edit source]
4. Getting started[edit source]
To start with blktrace, trace I/O traffic on a mounted block device (illustrated with the example of the block device /dev/mmcblk0p6, which is mounted as /usr/local):
mount | grep mmcblk
/dev/mmcblk0p5 on / type ext4 (rw,relatime,data=ordered)
/dev/mmcblk0p4 on /boot type ext4 (rw,relatime,data=ordered)
/dev/mmcblk0p6 on /usr/local type ext4 (rw,relatime,data=ordered)
- Launch the blktrace tool in background:
blktrace -d /dev/mmcblk0p6 &
- Read /usr/local content (it generates read access to the associated block device):
ls -la /usr/local
- Put blktrace activity in foreground and then stop it by pressing Ctrl+C:
fg blktrace -d /dev/mmcblk0p6 <Ctrl-C> ^C=== mmcblk0p6 === CPU 0: 98 events, 5 KiB data CPU 1: 79 events, 4 KiB data Total: 177 events (dropped 0), 9 KiB data
For detailed guidelines on blktrace usage, refer to the man page [1] or to the help information:
blktrace --help Usage: blktrace -d <dev> | --dev=<dev> [ -r <debugfs path> | --relay=<debugfs path> ] [ -o <file> | --output=<file>] [ -D <dir> | --output-dir=<dir> [ -w
To get started with blktrace, you can also refer to the Yocto Project wiki page for blktrace[3], which provides additional details as well as an example.
5. To go further[edit source]
5.1. blkparse usage[edit source]
In addition to displaying information for the user on the console, blktrace also creates trace files (one per CPU), which can be viewed using blkparse. These files are stored under the current path directory.
blkparse mmcblk0p6 Input file mmcblk0p6.blktrace.0 added Input file mmcblk0p6.blktrace.1 added 179,6 0 1 0.000000000 99 P N [jbd2/mmcblk0p5-] 179,6 0 0 0.000337792 0 m N cfq99SN insert_request 179,6 0 0 0.000344292 0 m N cfq99SN add_to_rr 179,6 0 0 0.000366250 0 m N cfq99SN insert_request 179,6 0 0 0.000374792 0 m N cfq99SN insert_request 179,6 0 0 0.000382458 0 m N cfq99SN insert_request 179,6 0 0 0.000390167 0 m N cfq99SN insert_request 179,6 0 2 0.000396625 99 U N [jbd2/mmcblk0p5-] 5 179,6 0 0 0.000452542 0 m N cfq workload slice:150000000 179,6 0 0 0.000460750 0 m N cfq99SN set_active wl_class:0 wl_type:1 179,6 0 0 0.000469083 0 m N cfq99SN dispatch_insert 179,6 0 0 0.000478500 0 m N cfq99SN dispatched a request 179,6 0 0 0.000484583 0 m N cfq99SN activate rq, drv=1 179,6 0 0 0.000747292 0 m N cfq99SN dispatch_insert 179,6 0 0 0.000755042 0 m N cfq99SN dispatched a request 179,6 0 0 0.000759708 0 m N cfq99SN activate rq, drv=2 179,6 0 0 0.004197583 0 m N cfq99SN complete rqnoidle 1 179,6 0 0 0.004206958 0 m N cfq99SN set_slice=120000000 179,6 0 0 0.004231917 0 m N cfq99SN dispatch_insert 179,6 0 0 0.004239208 0 m N cfq99SN dispatched a request 179,6 0 0 0.004243958 0 m N cfq99SN activate rq, drv=2 179,6 0 0 0.006287958 0 m N cfq99SN complete rqnoidle 1 179,6 0 0 0.006305208 0 m N cfq99SN dispatch_insert 179,6 0 0 0.006310542 0 m N cfq99SN dispatched a request 179,6 0 0 0.006315417 0 m N cfq99SN activate rq, drv=2 179,6 0 0 0.008340833 0 m N cfq99SN complete rqnoidle 1 179,6 0 0 0.008359000 0 m N cfq99SN dispatch_insert 179,6 0 0 0.008365083 0 m N cfq99SN dispatched a request 179,6 0 0 0.008370000 0 m N cfq99SN activate rq, drv=2 179,6 0 0 0.011504375 0 m N cfq99SN complete rqnoidle 1 179,6 0 0 0.014671667 0 m N cfq99SN insert_request 179,6 0 0 0.014727458 0 m N cfq99SN complete rqnoidle 1 179,6 0 0 0.014731250 0 m N cfq schedule dispatch 179,6 0 0 0.014808000 0 m N cfq99SN dispatch_insert 179,6 0 0 0.014813875 0 m N cfq99SN dispatched a request 179,6 0 0 0.014819958 0 m N cfq99SN activate rq, drv=1 179,6 0 0 0.017068708 0 m N cfq99SN complete rqnoidle 1 179,6 0 0 0.017078375 0 m N cfq schedule dispatch 179,0 0 3 5.759777419 193 A WS 1706892 + 2 <- (179,6) 32778 179,6 0 4 5.759784878 193 Q WS 1706892 + 2 [jbd2/mmcblk0p6-] 179,6 0 5 5.759849336 193 G WS 1706892 + 2 [jbd2/mmcblk0p6-] 179,6 0 6 5.759854253 193 P N [jbd2/mmcblk0p6-] 179,6 1 1 5.759855044 99 P N [jbd2/mmcblk0p5-] 179,0 0 7 5.759887628 193 A WS 1706894 + 2 <- (179,6) 32780 179,6 0 8 5.759893919 193 Q WS 1706894 + 2 [jbd2/mmcblk0p6-] 179,6 0 9 5.759947753 193 G WS 1706894 + 2 [jbd2/mmcblk0p6-] 179,6 1 0 5.759975503 0 m N cfq99SN insert_request 179,6 1 0 5.759990336 0 m N cfq99SN insert_request 179,6 1 2 5.759999253 99 U N [jbd2/mmcblk0p5-] 2 179,6 0 10 5.760024669 193 I WS 1706892 + 2 [jbd2/mmcblk0p6-] 179,6 0 0 5.760035461 0 m N cfq193SN insert_request 179,6 0 0 5.760041711 0 m N cfq193SN add_to_rr 179,6 0 0 5.760053169 0 m N cfq193SN preempt 179,6 0 0 5.760059253 0 m N cfq99SN slice expired t=1 179,6 0 0 5.760066503 0 m N cfq99SN resid=-5635859836 179,6 0 0 5.760081503 0 m N cfq99SN sl_used=120000000 disp=6 charge=120000000 iops=0 sect=12 179,6 0 11 5.760087294 193 I WS 1706894 + 2 [jbd2/mmcblk0p6-] 179,6 0 0 5.760091586 0 m N cfq193SN insert_request 179,6 0 12 5.760096294 193 U N [jbd2/mmcblk0p6-] 2 179,6 1 0 5.760111211 0 m N cfq workload slice:300000000 179,6 1 0 5.760118086 0 m N cfq193SN set_active wl_class:0 wl_type:1 179,6 1 0 5.760125669 0 m N cfq193SN dispatch_insert 179,6 1 0 5.760133128 0 m N cfq193SN dispatched a request 179,6 1 0 5.760137711 0 m N cfq193SN activate rq, drv=1 179,6 1 3 5.760145253 80 D WS 1706892 + 2 [mmcqd/0] 179,6 1 0 5.760393003 0 m N cfq193SN dispatch_insert 179,6 1 0 5.760399961 0 m N cfq193SN dispatched a request 179,6 1 0 5.760404128 0 m N cfq193SN activate rq, drv=2 179,6 1 4 5.760408211 80 D WS 1706894 + 2 [mmcqd/0] 179,6 1 5 5.764367836 80 C WS 1706892 + 2 [0] 179,6 1 0 5.764403128 0 m N cfq193SN complete rqnoidle 1 179,6 1 0 5.764412461 0 m N cfq193SN set_slice=120000000 179,6 1 0 5.764439169 0 m N cfq193SN slice expired t=0 179,6 1 0 5.764450253 0 m N cfq193SN sl_used=33750 disp=2 charge=33750 iops=0 sect=4 179,6 1 0 5.764456836 0 m N cfq193SN del_from_rr 179,6 1 0 5.764464711 0 m N cfq99SN set_active wl_class:0 wl_type:1 179,6 1 0 5.764470211 0 m N cfq99SN dispatch_insert 179,6 1 0 5.764475669 0 m N cfq99SN dispatched a request 179,6 1 0 5.764479378 0 m N cfq99SN activate rq, drv=2 179,6 1 6 5.767516794 80 C WS 1706894 + 2 [0] 179,6 1 0 5.767546961 0 m N cfq193SN complete rqnoidle 1 179,6 1 0 5.767564836 0 m N cfq99SN dispatch_insert 179,6 1 0 5.767571086 0 m N cfq99SN dispatched a request 179,6 1 0 5.767575628 0 m N cfq99SN activate rq, drv=2 179,0 0 13 5.767654378 193 A FWFS 1706896 + 2 <- (179,6) 32782 179,6 0 14 5.767662669 193 Q WS 1706896 + 2 [jbd2/mmcblk0p6-] 179,6 0 15 5.767726461 193 G WS 1706896 + 2 [jbd2/mmcblk0p6-] 179,6 0 16 5.767734169 193 I WS 1706896 + 2 [jbd2/mmcblk0p6-] 179,6 0 0 5.767744003 0 m N cfq193SN insert_request 179,6 0 0 5.767750253 0 m N cfq193SN add_to_rr 179,6 0 0 5.767760628 0 m N cfq193SN preempt 179,6 0 0 5.767764336 0 m N cfq99SN slice expired t=1 179,6 0 0 5.767770044 0 m N cfq99SN resid=120000000 179,6 0 0 5.767781378 0 m N cfq99SN sl_used=10000000 disp=2 charge=10000000 iops=0 sect=4 179,6 0 0 5.767784378 0 m N cfq99SN del_from_rr 179,6 1 0 5.772038836 0 m N cfq99SN complete rqnoidle 1 179,6 1 0 5.772064253 0 m N cfq193SN set_active wl_class:0 wl_type:1 179,6 1 0 5.772070878 0 m N cfq193SN dispatch_insert 179,6 1 0 5.772077044 0 m N cfq193SN dispatched a request 179,6 1 0 5.772081878 0 m N cfq193SN activate rq, drv=2 179,6 1 7 5.772085086 80 D WS 1706896 + 2 [mmcqd/0] 179,6 1 0 5.774473336 0 m N cfq99SN insert_request 179,6 1 0 5.774481419 0 m N cfq99SN add_to_rr 179,6 1 0 5.774490461 0 m N cfq99SN preempt 179,6 1 0 5.774496211 0 m N cfq193SN slice expired t=1 179,6 1 0 5.774502586 0 m N cfq193SN resid=120000000 179,6 1 0 5.774515044 0 m N cfq193SN sl_used=10000000 disp=1 charge=10000000 iops=0 sect=2 179,6 1 0 5.774519128 0 m N cfq193SN del_from_rr 179,6 1 0 5.774558711 0 m N cfq99SN complete rqnoidle 1 179,6 1 0 5.774577211 0 m N cfq99SN set_active wl_class:0 wl_type:1 179,6 1 0 5.774583919 0 m N cfq99SN dispatch_insert 179,6 1 0 5.774590253 0 m N cfq99SN dispatched a request 179,6 1 0 5.774595086 0 m N cfq99SN activate rq, drv=2 179,6 1 8 5.777926544 80 C WS 1706896 + 2 [0] 179,6 1 0 5.777956461 0 m N cfq193SN complete rqnoidle 1 179,6 1 0 5.782932794 0 m N cfq99SN complete rqnoidle 1 179,6 1 0 5.782943419 0 m N cfq99SN set_slice=120000000 179,6 1 0 5.782949919 0 m N cfq schedule dispatch CPU0 (mmcblk0p6): Reads Queued: 0, 0KiB Writes Queued: 3, 3KiB Read Dispatches: 0, 0KiB Write Dispatches: 0, 0KiB Reads Requeued: 0 Writes Requeued: 0 Reads Completed: 0, 0KiB Writes Completed: 0, 0KiB Read Merges: 0, 0KiB Write Merges: 0, 0KiB Read depth: 0 Write depth: 2 IO unplugs: 2 Timer unplugs: 0 CPU1 (mmcblk0p6): Reads Queued: 0, 0KiB Writes Queued: 0, 0KiB Read Dispatches: 0, 0KiB Write Dispatches: 3, 3KiB Reads Requeued: 0 Writes Requeued: 0 Reads Completed: 0, 0KiB Writes Completed: 3, 3KiB Read Merges: 0, 0KiB Write Merges: 0, 0KiB Read depth: 0 Write depth: 2 IO unplugs: 1 Timer unplugs: 0 Total (mmcblk0p6): Reads Queued: 0, 0KiB Writes Queued: 3, 3KiB Read Dispatches: 0, 0KiB Write Dispatches: 3, 3KiB Reads Requeued: 0 Writes Requeued: 0 Reads Completed: 0, 0KiB Writes Completed: 3, 3KiB Read Merges: 0, 0KiB Write Merges: 0, 0KiB IO unplugs: 3 Timer unplugs: 0 Throughput (R/W): 0KiB/s / 0KiB/s Events (mmcblk0p6): 118 entries Skips: 0 forward (0 - 0.0%)
5.2. ftrace usage[edit source]
As soon as the Linux kernel configuration CONFIG_BLK_DEV_IO_TRACE is active, the block layer (blk) action can be traced by using ftrace:
- In this case, only the blk tracer may be configured for ftrace, as shown by the results of the following command:
mount -t tracefs nodev /sys/kernel/tracing
cat /sys/kernel/tracing/available_tracers
blk nop
- To get more ftrace tracers (such as. "function"), additional Linux kernel configuration options must be activated through the Distribution Package, as explained in the ftrace article.
By taking previous example on /usr/local read content (mount point to mcblk0p6):
echo 1 > /sys/block/mmcblk0/mmcblk0p6/trace/enable echo blk > /sys/kernel/tracing/current_tracer ls -la /usr/local cat /sys/kernel/tracing/trace_pipe
jbd2/mmcblk0p5--97 [001] ...1 100.412943: 179,0 A WS 415902 + 2 <- (179,5) 278652
jbd2/mmcblk0p6--196 [000] ...1 100.412943: 179,0 A WS 1706892 + 2 <- (179,6) 32778
jbd2/mmcblk0p5--97 [001] ...1 100.412974: 179,0 Q WS 415902 + 2 [jbd2/mmcblk0p5-]
jbd2/mmcblk0p6--196 [000] ...1 100.412987: 179,0 Q WS 1706892 + 2 [jbd2/mmcblk0p6-]
jbd2/mmcblk0p5--97 [001] ...1 100.413012: 179,0 G WS 415902 + 2 [jbd2/mmcblk0p5-]
jbd2/mmcblk0p6--196 [000] ...1 100.413012: 179,0 G WS 1706892 + 2 [jbd2/mmcblk0p6-]
jbd2/mmcblk0p6--196 [000] ...1 100.413018: 179,0 P N [jbd2/mmcblk0p6-]
jbd2/mmcblk0p5--97 [001] ...1 100.413019: 179,0 P N [jbd2/mmcblk0p5-]
jbd2/mmcblk0p5--97 [001] ...1 100.413034: 179,0 A WS 415904 + 2 <- (179,5) 278654
jbd2/mmcblk0p6--196 [000] ...1 100.413034: 179,0 A WS 1706894 + 2 <- (179,6) 32780
jbd2/mmcblk0p5--97 [001] ...1 100.413040: 179,0 Q WS 415904 + 2 [jbd2/mmcblk0p5-]
jbd2/mmcblk0p6--196 [000] ...1 100.413040: 179,0 Q WS 1706894 + 2 [jbd2/mmcblk0p6-]
jbd2/mmcblk0p5--97 [001] ...1 100.413054: 179,0 G WS 415904 + 2 [jbd2/mmcblk0p5-]
jbd2/mmcblk0p6--196 [000] ...1 100.413056: 179,0 G WS 1706894 + 2 [jbd2/mmcblk0p6-]
jbd2/mmcblk0p6--196 [000] ...2 100.413071: 179,0 I WS 1706892 + 2 [jbd2/mmcblk0p6-]
jbd2/mmcblk0p6--196 [000] ...1 100.413092: 179,0 m N cfq196SN insert_request
jbd2/mmcblk0p6--196 [000] ...2 100.413104: 179,0 I WS 1706894 + 2 [jbd2/mmcblk0p6-]
jbd2/mmcblk0p6--196 [000] ...1 100.413111: 179,0 m N cfq196SN insert_request
jbd2/mmcblk0p6--196 [000] ...2 100.413118: 179,0 U N [jbd2/mmcblk0p6-] 2
jbd2/mmcblk0p5--97 [001] ...2 100.413135: 179,0 I WS 415902 + 2 [jbd2/mmcblk0p5-]
jbd2/mmcblk0p5--97 [001] ...1 100.413144: 179,0 m N cfq97SN insert_request
jbd2/mmcblk0p5--97 [001] ...1 100.413151: 179,0 m N cfq97SN add_to_rr
jbd2/mmcblk0p5--97 [001] ...1 100.413162: 179,0 m N cfq97SN preempt
jbd2/mmcblk0p5--97 [001] ...1 100.413168: 179,0 m N cfq196SN slice expired t=1
jbd2/mmcblk0p5--97 [001] ...1 100.413176: 179,0 m N cfq196SN resid=-32494149849
jbd2/mmcblk0p5--97 [001] ...1 100.413191: 179,0 m N cfq196SN sl_used=120000000 disp=1 charge=120000000 iops=0 sect=2
jbd2/mmcblk0p5--97 [001] ...2 100.413199: 179,0 I WS 415904 + 2 [jbd2/mmcblk0p5-]
jbd2/mmcblk0p5--97 [001] ...1 100.413205: 179,0 m N cfq97SN insert_request
jbd2/mmcblk0p5--97 [001] ...2 100.413211: 179,0 U N [jbd2/mmcblk0p5-] 2
mmcqd/0-80 [000] ...1 100.413224: 179,0 m N cfq workload slice:200000000
mmcqd/0-80 [000] ...1 100.413232: 179,0 m N cfq97SN set_active wl_class:0 wl_type:1
mmcqd/0-80 [000] ...1 100.413241: 179,0 m N cfq97SN dispatch_insert
mmcqd/0-80 [000] ...1 100.413250: 179,0 m N cfq97SN dispatched a request
mmcqd/0-80 [000] ...1 100.413256: 179,0 m N cfq97SN activate rq, drv=1
mmcqd/0-80 [000] ...2 100.413261: 179,0 D WS 415902 + 2 [mmcqd/0]
mmcqd/0-80 [000] ...1 100.413515: 179,0 m N cfq97SN dispatch_insert
mmcqd/0-80 [000] ...1 100.413524: 179,0 m N cfq97SN dispatched a request
mmcqd/0-80 [000] ...1 100.413530: 179,0 m N cfq97SN activate rq, drv=2
mmcqd/0-80 [000] ...2 100.413534: 179,0 D WS 415904 + 2 [mmcqd/0]
mmcqd/0-80 [000] ...1 100.417441: 179,0 C WS 415902 + 2 [0]
mmcqd/0-80 [000] ...1 100.417482: 179,0 m N cfq97SN complete rqnoidle 1
mmcqd/0-80 [000] ...1 100.417494: 179,0 m N cfq97SN set_slice=120000000
mmcqd/0-80 [000] ...1 100.417526: 179,0 m N cfq97SN slice expired t=0
mmcqd/0-80 [000] ...1 100.417539: 179,0 m N cfq97SN sl_used=40584 disp=2 charge=40584 iops=0 sect=4
mmcqd/0-80 [000] ...1 100.417545: 179,0 m N cfq97SN del_from_rr
mmcqd/0-80 [000] ...1 100.417555: 179,0 m N cfq196SN set_active wl_class:0 wl_type:1
mmcqd/0-80 [000] ...1 100.417561: 179,0 m N cfq196SN dispatch_insert
mmcqd/0-80 [000] ...1 100.417569: 179,0 m N cfq196SN dispatched a request
mmcqd/0-80 [000] ...1 100.417575: 179,0 m N cfq196SN activate rq, drv=2
mmcqd/0-80 [000] ...2 100.417579: 179,0 D WS 1706892 + 2 [mmcqd/0]
mmcqd/0-80 [000] ...1 100.419353: 179,0 C WS 415904 + 2 [0]
mmcqd/0-80 [000] ...1 100.419380: 179,0 m N cfq97SN complete rqnoidle 1
mmcqd/0-80 [000] ...1 100.419393: 179,0 m N cfq196SN dispatch_insert
mmcqd/0-80 [000] ...1 100.419400: 179,0 m N cfq196SN dispatched a request
mmcqd/0-80 [000] ...1 100.419405: 179,0 m N cfq196SN activate rq, drv=2
mmcqd/0-80 [000] ...2 100.419409: 179,0 D WS 1706894 + 2 [mmcqd/0]
jbd2/mmcblk0p5--97 [001] ...1 100.419431: 179,0 A FWFS 415906 + 2 <- (179,5) 278656
jbd2/mmcblk0p5--97 [001] ...1 100.419440: 179,0 Q WS 415906 + 2 [jbd2/mmcblk0p5-]
jbd2/mmcblk0p5--97 [001] ...1 100.419465: 179,0 G WS 415906 + 2 [jbd2/mmcblk0p5-]
jbd2/mmcblk0p5--97 [001] ...2 100.419475: 179,0 I WS 415906 + 2 [jbd2/mmcblk0p5-]
jbd2/mmcblk0p5--97 [001] ...1 100.419484: 179,0 m N cfq97SN insert_request
jbd2/mmcblk0p5--97 [001] ...1 100.419491: 179,0 m N cfq97SN add_to_rr
jbd2/mmcblk0p5--97 [001] ...1 100.419502: 179,0 m N cfq97SN preempt
jbd2/mmcblk0p5--97 [001] ...1 100.419507: 179,0 m N cfq196SN slice expired t=1
jbd2/mmcblk0p5--97 [001] ...1 100.419514: 179,0 m N cfq196SN resid=120000000
jbd2/mmcblk0p5--97 [001] ...1 100.419526: 179,0 m N cfq196SN sl_used=10000000 disp=2 charge=10000000 iops=0 sect=4
jbd2/mmcblk0p5--97 [001] ...1 100.419530: 179,0 m N cfq196SN del_from_rr
mmcqd/0-80 [000] ...1 100.424339: 179,0 C WS 1706892 + 2 [0]
mmcqd/0-80 [000] ...1 100.424367: 179,0 m N cfq196SN complete rqnoidle 1
mmcqd/0-80 [000] ...1 100.424388: 179,0 m N cfq97SN set_active wl_class:0 wl_type:1
mmcqd/0-80 [000] ...1 100.424396: 179,0 m N cfq97SN dispatch_insert
mmcqd/0-80 [000] ...1 100.424404: 179,0 m N cfq97SN dispatched a request
mmcqd/0-80 [000] ...1 100.424409: 179,0 m N cfq97SN activate rq, drv=2
mmcqd/0-80 [000] ...2 100.424413: 179,0 D WS 415906 + 2 [mmcqd/0]
mmcqd/0-80 [000] ...1 100.427349: 179,0 C WS 1706894 + 2 [0]
mmcqd/0-80 [000] ...1 100.427382: 179,0 m N cfq196SN complete rqnoidle 1
jbd2/mmcblk0p6--196 [000] ...1 100.427441: 179,0 A FWFS 1706896 + 2 <- (179,6) 32782
jbd2/mmcblk0p6--196 [000] ...1 100.427458: 179,0 Q WS 1706896 + 2 [jbd2/mmcblk0p6-]
jbd2/mmcblk0p6--196 [000] ...1 100.427482: 179,0 G WS 1706896 + 2 [jbd2/mmcblk0p6-]
jbd2/mmcblk0p6--196 [000] ...2 100.427492: 179,0 I WS 1706896 + 2 [jbd2/mmcblk0p6-]
jbd2/mmcblk0p6--196 [000] ...1 100.427499: 179,0 m N cfq196SN insert_request
jbd2/mmcblk0p6--196 [000] ...1 100.427505: 179,0 m N cfq196SN add_to_rr
jbd2/mmcblk0p6--196 [000] ...1 100.427516: 179,0 m N cfq196SN preempt
jbd2/mmcblk0p6--196 [000] ...1 100.427521: 179,0 m N cfq97SN slice expired t=1
jbd2/mmcblk0p6--196 [000] ...1 100.427528: 179,0 m N cfq97SN resid=120000000
jbd2/mmcblk0p6--196 [000] ...1 100.427545: 179,0 m N cfq97SN sl_used=10000000 disp=1 charge=10000000 iops=0 sect=2
jbd2/mmcblk0p6--196 [000] ...1 100.427550: 179,0 m N cfq97SN del_from_rr
mmcqd/0-80 [000] ...1 100.427598: 179,0 m N cfq196SN set_active wl_class:0 wl_type:1
mmcqd/0-80 [000] ...1 100.427605: 179,0 m N cfq196SN dispatch_insert
mmcqd/0-80 [000] ...1 100.427612: 179,0 m N cfq196SN dispatched a request
mmcqd/0-80 [000] ...1 100.427618: 179,0 m N cfq196SN activate rq, drv=2
mmcqd/0-80 [000] ...2 100.427622: 179,0 D WS 1706896 + 2 [mmcqd/0]
mmcqd/0-80 [000] ...1 100.431133: 179,0 C WS 415906 + 2 [0]
mmcqd/0-80 [000] ...1 100.431164: 179,0 m N cfq97SN complete rqnoidle 1
mmcqd/0-80 [000] ...1 100.434921: 179,0 C WS 1706896 + 2 [0]
mmcqd/0-80 [000] ...1 100.434951: 179,0 m N cfq196SN complete rqnoidle 1
mmcqd/0-80 [000] ...1 100.434962: 179,0 m N cfq196SN set_slice=120000000
mmcqd/0-80 [000] ...1 100.434969: 179,0 m N cfq schedule dispatch
kworker/u4:1-65 [001] ...1 101.612916: 179,0 A WM 137922 + 2 <- (179,5) 672
kworker/u4:1-65 [001] ...1 101.612949: 179,0 Q WM 137922 + 2 [kworker/u4:1]
kworker/u4:1-65 [001] ...1 101.613001: 179,0 G WM 137922 + 2 [kworker/u4:1]
kworker/u4:1-65 [001] ...1 101.613012: 179,0 P N [kworker/u4:1]
kworker/u4:1-65 [001] ...1 101.613071: 179,0 A WM 1674662 + 2 <- (179,6) 548
kworker/u4:1-65 [001] ...1 101.613077: 179,0 Q WM 1674662 + 2 [kworker/u4:1]
kworker/u4:1-65 [001] ...1 101.613093: 179,0 G WM 1674662 + 2 [kworker/u4:1]
kworker/u4:1-65 [001] ...2 101.613119: 179,0 I WM 137922 + 2 [kworker/u4:1]
kworker/u4:1-65 [001] ...1 101.613131: 179,0 m N cfq200A insert_request
kworker/u4:1-65 [001] ...1 101.613139: 179,0 m N cfq200A add_to_rr
kworker/u4:1-65 [001] ...1 101.613152: 179,0 m N cfq200A preempt
kworker/u4:1-65 [001] ...1 101.613157: 179,0 m N cfq196SN slice expired t=1
kworker/u4:1-65 [001] ...1 101.613164: 179,0 m N cfq196SN resid=-1058203000
kworker/u4:1-65 [001] ...1 101.613179: 179,0 m N cfq196SN sl_used=120000000 disp=1 charge=120000000 iops=0 sect=2
kworker/u4:1-65 [001] ...1 101.613185: 179,0 m N cfq196SN del_from_rr
kworker/u4:1-65 [001] ...2 101.613198: 179,0 I WM 1674662 + 2 [kworker/u4:1]
kworker/u4:1-65 [001] ...1 101.613206: 179,0 m N cfq200A insert_request
kworker/u4:1-65 [001] ...2 101.613214: 179,0 U N [kworker/u4:1] 2
mmcqd/0-80 [000] ...1 101.613238: 179,0 m N cfq workload slice:40000000
mmcqd/0-80 [000] ...1 101.613248: 179,0 m N cfq200A set_active wl_class:0 wl_type:0
mmcqd/0-80 [000] ...1 101.613258: 179,0 m N cfq200A dispatch_insert
mmcqd/0-80 [000] ...1 101.613267: 179,0 m N cfq200A dispatched a request
mmcqd/0-80 [000] ...1 101.613274: 179,0 m N cfq200A activate rq, drv=1
mmcqd/0-80 [000] ...2 101.613280: 179,0 D WM 1674662 + 2 [mmcqd/0]
mmcqd/0-80 [000] ...1 101.613511: 179,0 m N cfq200A dispatch_insert
mmcqd/0-80 [000] ...1 101.613520: 179,0 m N cfq200A dispatched a request
mmcqd/0-80 [000] ...1 101.613525: 179,0 m N cfq200A activate rq, drv=2
mmcqd/0-80 [000] ...2 101.613529: 179,0 D WM 137922 + 2 [mmcqd/0]
mmcqd/0-80 [000] ...1 101.618520: 179,0 C WM 1674662 + 2 [0]
mmcqd/0-80 [000] ...1 101.618576: 179,0 m N cfq200A complete rqnoidle 0
mmcqd/0-80 [000] ...1 101.618586: 179,0 m N cfq200A set_slice=40000000
mmcqd/0-80 [000] ...1 101.623185: 179,0 C WM 137922 + 2 [0]
mmcqd/0-80 [000] ...1 101.623215: 179,0 m N cfq200A complete rqnoidle 0
mmcqd/0-80 [000] ...1 101.623221: 179,0 m N cfq schedule dispatch
6. References[edit source]
- Useful external links
| Document link | Document Type | Description |
|---|---|---|
| blktrace tool source code including userspace tool | Sources | blktrace sources git |
| blktrace Presentation | Presentation | Presentation by Alan D. Brunelle |