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docs: update delaytop documentation for new interactive features

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This commit updates the delaytop documentation to reflect the newly
added features:
1) Added comprehensive description of interactive keyboard controls
2) Documented all available sort fields
3) Added examples for advanced usage scenarios
4) Included PSI availability note

Link: https://lkml.kernel.org/r/20250907001457696qAqUGGkV1VfEO6OkVMovW@zte.com.cn
Signed-off-by: Fan Yu <fan.yu9@zte.com.cn>
Reviewed-by: xu xin <xu.xin16@zte.com.cn>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Fan Yu
2025-09-07 00:14:57 +08:00
committed by Andrew Morton
parent 0c10f9cd81
commit c25822ccaa
1 changed files with 57 additions and 32 deletions
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89
Documentation/accounting/delay-accounting.rst
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@@ -134,47 +134,72 @@ The above command can be used with -v to get more debug information.
After the system starts, use `delaytop` to get the system-wide delay information, After the system starts, use `delaytop` to get the system-wide delay information,
which includes system-wide PSI information and Top-N high-latency tasks. which includes system-wide PSI information and Top-N high-latency tasks.
Note: PSI support requires `CONFIG_PSI=y` and `psi=1` for full functionality.
`delaytop` supports sorting by CPU latency in descending order by default, `delaytop` is an interactive tool for monitoring system pressure and task delays.
displays the top 20 high-latency tasks by default, and refreshes the latency It supports multiple sorting options, display modes, and real-time keyboard controls.
data every 2 seconds by default.
Get PSI information and Top-N tasks delay, since system boot:: Basic usage with default settings (sorts by CPU delay, shows top 20 tasks, refreshes every 2 seconds)::
bash# ./delaytop bash# ./delaytop
System Pressure Information: (avg10/avg60/avg300/total) System Pressure Information: (avg10/avg60vg300/total)
CPU some: 0.0%/ 0.0%/ 0.0%/ 345(ms) CPU some: 0.0%/ 0.0%/ 0.0%/ 106137(ms)
CPU full: 0.0%/ 0.0%/ 0.0%/ 0(ms) CPU full: 0.0%/ 0.0%/ 0.0%/ 0(ms)
Memory full: 0.0%/ 0.0%/ 0.0%/ 0(ms) Memory full: 0.0%/ 0.0%/ 0.0%/ 0(ms)
Memory some: 0.0%/ 0.0%/ 0.0%/ 0(ms) Memory some: 0.0%/ 0.0%/ 0.0%/ 0(ms)
IO full: 0.0%/ 0.0%/ 0.0%/ 65(ms) IO full: 0.0%/ 0.0%/ 0.0%/ 2240(ms)
IO some: 0.0%/ 0.0%/ 0.0%/ 79(ms) IO some: 0.0%/ 0.0%/ 0.0%/ 2783(ms)
IRQ full: 0.0%/ 0.0%/ 0.0%/ 0(ms) IRQ full: 0.0%/ 0.0%/ 0.0%/ 0(ms)
Top 20 processes (sorted by CPU delay): [o]sort [M]memverbose [q]quit
PID TGID COMMAND CPU(ms) IO(ms) SWAP(ms) RCL(ms) THR(ms) CMP(ms) WP(ms) IRQ(ms) Top 20 processes (sorted by cpu delay):
---------------------------------------------------------------------------------------------- PID TGID COMMAND CPU(ms) IO(ms) IRQ(ms) MEM(ms)
161 161 zombie_memcg_re 1.40 0.00 0.00 0.00 0.00 0.00 0.00 0.00 ------------------------------------------------------------------------
130 130 blkcg_punt_bio 1.37 0.00 0.00 0.00 0.00 0.00 0.00 0.00 110 110 kworker/15:0H-s 27.91 0.00 0.00 0.00
444 444 scsi_tmf_0 0.73 0.00 0.00 0.00 0.00 0.00 0.00 0.00 57 57 cpuhp/7 3.18 0.00 0.00 0.00
1280 1280 rsyslogd 0.53 0.04 0.00 0.00 0.00 0.00 0.00 0.00 99 99 cpuhp/14 2.97 0.00 0.00 0.00
12 12 ksoftirqd/0 0.47 0.00 0.00 0.00 0.00 0.00 0.00 0.00 51 51 cpuhp/6 0.90 0.00 0.00 0.00
1277 1277 nbd-server 0.44 0.00 0.00 0.00 0.00 0.00 0.00 0.00 44 44 kworker/4:0H-sy 0.80 0.00 0.00 0.00
308 308 kworker/2:2-sys 0.41 0.00 0.00 0.00 0.00 0.00 0.00 0.00 60 60 ksoftirqd/7 0.74 0.00 0.00 0.00
55 55 netns 0.36 0.00 0.00 0.00 0.00 0.00 0.00 0.00 76 76 idle_inject/10 0.31 0.00 0.00 0.00
1187 1187 acpid 0.31 0.03 0.00 0.00 0.00 0.00 0.00 0.00 100 100 idle_inject/14 0.30 0.00 0.00 0.00
6184 6184 kworker/1:2-sys 0.24 0.00 0.00 0.00 0.00 0.00 0.00 0.00 1309 1309 systemsettings 0.29 0.00 0.00 0.00
186 186 kaluad 0.24 0.00 0.00 0.00 0.00 0.00 0.00 0.00 45 45 cpuhp/5 0.22 0.00 0.00 0.00
18 18 ksoftirqd/1 0.24 0.00 0.00 0.00 0.00 0.00 0.00 0.00 63 63 cpuhp/8 0.20 0.00 0.00 0.00
185 185 kmpath_rdacd 0.23 0.00 0.00 0.00 0.00 0.00 0.00 0.00 87 87 cpuhp/12 0.18 0.00 0.00 0.00
190 190 kstrp 0.23 0.00 0.00 0.00 0.00 0.00 0.00 0.00 93 93 cpuhp/13 0.17 0.00 0.00 0.00
2759 2759 agetty 0.20 0.03 0.00 0.00 0.00 0.00 0.00 0.00 1265 1265 acpid 0.17 0.00 0.00 0.00
1190 1190 kworker/0:3-sys 0.19 0.00 0.00 0.00 0.00 0.00 0.00 0.00 1552 1552 sshd 0.17 0.00 0.00 0.00
1272 1272 sshd 0.15 0.04 0.00 0.00 0.00 0.00 0.00 0.00 2584 2584 sddm-helper 0.16 0.00 0.00 0.00
1156 1156 license 0.15 0.11 0.00 0.00 0.00 0.00 0.00 0.00 1284 1284 rtkit-daemon 0.15 0.00 0.00 0.00
134 134 md 0.13 0.00 0.00 0.00 0.00 0.00 0.00 0.00 1326 1326 nde-netfilter 0.14 0.00 0.00 0.00
6142 6142 kworker/3:2-xfs 0.13 0.00 0.00 0.00 0.00 0.00 0.00 0.00 27 27 cpuhp/2 0.13 0.00 0.00 0.00
631 631 kworker/11:2-rc 0.11 0.00 0.00 0.00
Dynamic interactive interface of delaytop:: Interactive keyboard controls during runtime::
o - Select sort field (CPU, IO, IRQ, Memory, etc.)
M - Toggle display mode (Default/Memory Verbose)
q - Quit
Available sort fields(use -s/--sort or interactive command)::
cpu(c) - CPU delay
blkio(i) - I/O delay
irq(q) - IRQ delay
mem(m) - Total memory delay
swapin(s) - Swapin delay (memory verbose mode only)
freepages(r) - Freepages reclaim delay (memory verbose mode only)
thrashing(t) - Thrashing delay (memory verbose mode only)
compact(p) - Compaction delay (memory verbose mode only)
wpcopy(w) - Write page copy delay (memory verbose mode only)
Advanced usage examples::
# ./delaytop -s blkio
Sorted by IO delay
# ./delaytop -s mem -M
Sorted by memory delay in memory verbose mode
# ./delaytop -p pid # ./delaytop -p pid
Print delayacct stats Print delayacct stats