delaytop-enhance-error-logging-and-add-psi-feature-description.patch removed from -mm tree
The quilt patch titled
Subject: delaytop: enhance error logging and add PSI feature description
has been removed from the -mm tree. Its filename was
delaytop-enhance-error-logging-and-add-psi-feature-description.patch
This patch was dropped because it was merged into the mm-nonmm-stable branch of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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From: <[email protected]>
Subject: delaytop: enhance error logging and add PSI feature description
Date: Mon, 28 Jul 2025 16:28:34 +0800 (CST)
This patch improves error diagnostics and documentation for delaytop:
1) Enhanced error logging:
- Added explicit error messages in critical failure paths
- Implemented BOOL_FPRINT macro for robust output handling
2) PSI feature documentation:
- Updated header comment to reflect PSI monitoring capability
- Improved output formatting for PSI information
System Pressure Information: (avg10/avg60/avg300/total) CPU some: 0.0%/ 0.0%/ 0.0%/ 345(ms) CPU 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) IO full: 0.0%/ 0.0%/ 0.0%/ 65(ms) IO some: 0.0%/ 0.0%/ 0.0%/ 79(ms) IRQ full: 0.0%/ 0.0%/ 0.0%/ 0(ms)
Signed-off-by Fan Yu <[email protected]>
Signed-off-by Wang Yaxin <[email protected]>
Acked-by Yang Yang <[email protected]>
Cc Fan Yu <[email protected]>
Cc Jonathan Corbet <[email protected]>
Cc xu xin <[email protected]>
Signed-off-by Andrew Morton <[email protected]>
---
Documentation/accounting/delay-accounting.rst | 61 +++--- tools/accounting/delaytop.c | 162 ++++++++++------ 2 files changed, 143 insertions(+), 80 deletions(-)
Documentation/accounting/delay-accounting.rst renamed from Documentation/accounting/delay-accounting.rst~delaytop-enhance-error-logging-and-add-psi-feature-description +35 -26
@@ -132,38 +132,47 @@ Get IO accounting for pid 1, it works on The above command can be used with -v to get more debug information. -After the system starts, use `delaytop` to get the Top-N high-latency tasks. -this tool supports sorting by CPU latency in descending order by default, +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. + +`delaytop` supports sorting by CPU latency in descending order by default, displays the top 20 high-latency tasks by default, and refreshes the latency data every 2 seconds by default. -Get Top-N tasks delay, since system boot:: +Get PSI information and Top-N tasks delay, since system boot:: bash# ./delaytop + System Pressure Information: (avg10/avg60/avg300/total) + CPU some: 0.0%/ 0.0%/ 0.0%/ 345(ms) + CPU 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) + IO full: 0.0%/ 0.0%/ 0.0%/ 65(ms) + IO some: 0.0%/ 0.0%/ 0.0%/ 79(ms) + IRQ full: 0.0%/ 0.0%/ 0.0%/ 0(ms) Top 20 processes (sorted by CPU delay): - - PID TGID COMMAND CPU(ms) IO(ms) SWAP(ms) RCL(ms) THR(ms) CMP(ms) WP(ms) IRQ(ms) - --------------------------------------------------------------------------------------------- - 32 32 kworker/2:0H-sy 23.65 0.00 0.00 0.00 0.00 0.00 0.00 0.00 - 497 497 kworker/R-scsi_ 1.20 0.00 0.00 0.00 0.00 0.00 0.00 0.00 - 495 495 kworker/R-scsi_ 1.13 0.00 0.00 0.00 0.00 0.00 0.00 0.00 - 494 494 scsi_eh_0 1.12 0.00 0.00 0.00 0.00 0.00 0.00 0.00 - 485 485 kworker/R-ata_s 0.90 0.00 0.00 0.00 0.00 0.00 0.00 0.00 - 574 574 kworker/R-kdmfl 0.36 0.00 0.00 0.00 0.00 0.00 0.00 0.00 - 34 34 idle_inject/3 0.33 0.00 0.00 0.00 0.00 0.00 0.00 0.00 - 1123 1123 nde-netfilter 0.28 0.00 0.00 0.00 0.00 0.00 0.00 0.00 - 60 60 ksoftirqd/7 0.25 0.00 0.00 0.00 0.00 0.00 0.00 0.00 - 114 114 kworker/0:2-cgr 0.25 0.00 0.00 0.00 0.00 0.00 0.00 0.00 - 496 496 scsi_eh_1 0.24 0.00 0.00 0.00 0.00 0.00 0.00 0.00 - 51 51 cpuhp/6 0.24 0.00 0.00 0.00 0.00 0.00 0.00 0.00 - 1667 1667 atd 0.24 0.00 0.00 0.00 0.00 0.00 0.00 0.00 - 45 45 cpuhp/5 0.23 0.00 0.00 0.00 0.00 0.00 0.00 0.00 - 1102 1102 nde-backupservi 0.22 0.00 0.00 0.00 0.00 0.00 0.00 0.00 - 1098 1098 systemsettings 0.21 0.00 0.00 0.00 0.00 0.00 0.00 0.00 - 1100 1100 audit-monitor 0.20 0.00 0.00 0.00 0.00 0.00 0.00 0.00 - 53 53 migration/6 0.20 0.00 0.00 0.00 0.00 0.00 0.00 0.00 - 1482 1482 sshd 0.19 0.00 0.00 0.00 0.00 0.00 0.00 0.00 - 39 39 cpuhp/4 0.19 0.00 0.00 0.00 0.00 0.00 0.00 0.00 + PID TGID COMMAND CPU(ms) IO(ms) SWAP(ms) RCL(ms) THR(ms) CMP(ms) WP(ms) IRQ(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 + 444 444 scsi_tmf_0 0.73 0.00 0.00 0.00 0.00 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 + 12 12 ksoftirqd/0 0.47 0.00 0.00 0.00 0.00 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 + 308 308 kworker/2:2-sys 0.41 0.00 0.00 0.00 0.00 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 + 1187 1187 acpid 0.31 0.03 0.00 0.00 0.00 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 + 186 186 kaluad 0.24 0.00 0.00 0.00 0.00 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 + 185 185 kmpath_rdacd 0.23 0.00 0.00 0.00 0.00 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 + 2759 2759 agetty 0.20 0.03 0.00 0.00 0.00 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 + 1272 1272 sshd 0.15 0.04 0.00 0.00 0.00 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 + 134 134 md 0.13 0.00 0.00 0.00 0.00 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 Dynamic interactive interface of delaytop::
tools/accounting/delaytop.c renamed from tools/accounting/delaytop.c~delaytop-enhance-error-logging-and-add-psi-feature-description +108 -54
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