mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
synced 2025-08-27 15:36:48 +00:00
loongarch-next
3 Commits
| Author | SHA1 | Message | Date | |
|---|---|---|---|---|
fan.yu9@zte.com.cn
|
d92dccd05a |
delaytop: enhance error logging and add PSI feature description
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) Link: https://lkml.kernel.org/r/202507281628341752gMXCMN7S-Vz_LHYHum9r@zte.com.cn Signed-off-by: Fan Yu <fan.yu9@zte.com.cn> Signed-off-by: Wang Yaxin <wang.yaxin@zte.com.cn> Acked-by: Yang Yang <yang.yang29@zte.com.cn> Cc: Fan Yu <fan.yu9@zte.com.cn> Cc: Jonathan Corbet <corbet@lwn.net> Cc: xu xin <xu.xin16@zte.com.cn> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> |
||
|
Wang Yaxin
|
6b47c9f8ee |
delaytop: add psi info to show system delay
Support showing whole delay of system by reading PSI, just like the first few lines of information output by the top command. the output of delaytop includes both system-wide delay and delay of individual tasks, providing a more comprehensive reflection of system latency status. Use case ======== bash# ./delaytop System Pressure Information: (avg10/avg60/avg300/total) CPU: full: 0.0%/ 0.0%/ 0.0%/0 some: 0.1%/ 0.0%/ 0.0%/14216596 Memory: full: 0.0%/ 0.0%/ 0.0%/34010659 some: 0.0%/ 0.0%/ 0.0%/35406492 IO: full: 0.1%/ 0.0%/ 0.0%/51029453 some: 0.1%/ 0.0%/ 0.0%/55330465 IRQ: full: 0.0%/ 0.0%/ 0.0%/0 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 Link: https://lkml.kernel.org/r/20250710135451340_5pOgpIFi0M5AE7H44W1D@zte.com.cn Co-developed-by: Fan Yu <fan.yu9@zte.com.cn> Signed-off-by: Fan Yu <fan.yu9@zte.com.cn> Signed-off-by: Wang Yaxin <wang.yaxin@zte.com.cn> Signed-off-by: Jiang Kun <jiang.kun2@zte.com.cn> Cc: Balbir Singh <bsingharora@gmail.com> Cc: David Hildenbrand <david@redhat.com> Cc: Peilin He <he.peilin@zte.com.cn> Cc: Qiang Tu <tu.qiang35@zte.com.cn> Cc: wangyong <wang.yong12@zte.com.cn> Cc: xu xin <xu.xin16@zte.com.cn> Cc: Yang Yang <yang.yang29@zte.com.cn> Cc: Yunkai Zhang <zhang.yunkai@zte.com.cn> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> |
||
|
Yaxin Wang
|
01bda05819 |
tools/accounting/delaytop: add delaytop to record top-n task delay
Problem
=======
The "getdelays" can only display the latency of a single task
by specifying a PID, but it has the following limitations:
1. single-task perspective: only supports querying the latency (CPU, I/O,
memory, etc.) of an individual task via PID and cannot provide a global
analysis of high-latency processes across the system.
2. lack of High-Latency process awareness: when the overall system
latency is high (e.g., a spike in CPU latency), there is no way to
quickly identify the top N processes contributing to the highest
latency.
3. poor interactivity: It lacks dynamic sorting and refresh
capabilities (similar to top), making it difficult to monitor latency
changes in real time.
Solution
========
To address these limitations, we introduce the "delaytop" with the
following capabilities:
1. system view: monitors latency metrics (CPU, I/O, memory, IRQ, etc.)
for all system processes
2. supports field-based sorting (e.g., default sort by CPU latency in
descending order)
3. dynamic interactive interface: focus on specific processes with
--pid; limit displayed entries with --processes 20; control monitoring
duration with --iterations;
Use case
========
bash# ./delaytop
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)
---------------------------------------------------------------------------------------------
26 26 kworker/1:0H 5.55 0.00 0.00 0.00 0.00 0.00 0.00 0.00
32 32 kworker/2:0H-kb 2.93 0.00 0.00 0.00 0.00 0.00 0.00 0.00
38 38 kworker/3:0H-ev 2.88 0.00 0.00 0.00 0.00 0.00 0.00 0.00
84 84 kworker/R-vfio- 1.62 0.00 0.00 0.00 0.00 0.00 0.00 0.00
24 24 ksoftirqd/1 1.43 0.00 0.00 0.00 0.00 0.00 0.00 0.00
19 19 idle_inject/0 0.99 0.00 0.00 0.00 0.00 0.00 0.00 0.00
16 16 rcu_exp_par_gp_ 0.87 0.00 0.00 0.00 0.00 0.00 0.00 0.00
11 11 kworker/0:1 0.87 0.00 0.00 0.00 0.00 0.00 0.00 0.00
22 22 idle_inject/1 0.80 0.00 0.00 0.00 0.00 0.00 0.00 0.00
3 3 pool_workqueue_ 0.74 0.00 0.00 0.00 0.00 0.00 0.00 0.00
81 81 scsi_eh_1 0.59 0.00 0.00 0.00 0.00 0.00 0.00 0.00
30 30 ksoftirqd/2 0.42 0.00 0.00 0.00 0.00 0.00 0.00 0.00
36 36 ksoftirqd/3 0.37 0.00 0.00 0.00 0.00 0.00 0.00 0.00
9 9 kworker/0:0-eve 0.36 0.00 0.00 0.00 0.00 0.00 0.00 0.00
8 8 kworker/R-netns 0.34 0.00 0.00 0.00 0.00 0.00 0.00 0.00
76 76 kworker/1:1-pm 0.32 0.00 0.00 0.00 0.00 0.00 0.00 0.00
21 21 cpuhp/1 0.30 0.00 0.00 0.00 0.00 0.00 0.00 0.00
4 4 kworker/R-rcu_g 0.21 0.00 0.00 0.00 0.00 0.00 0.00 0.00
12 12 kworker/u16:0-i 0.20 0.00 0.00 0.00 0.00 0.00 0.00 0.00
1 1 init 0.18 0.00 0.00 0.00 0.00 0.00 0.08 0.00
Link: https://lkml.kernel.org/r/20250619211843633h05gWrBDMFkEH6xAVm_5y@zte.com.cn
Co-developed-by: Fan Yu <fan.yu9@zte.com.cn>
Signed-off-by: Fan Yu <fan.yu9@zte.com.cn>
Signed-off-by: Yaxin Wang <wang.yaxin@zte.com.cn>
Cc: Balbir Singh <bsingharora@gmail.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Peilin He <he.peilin@zte.com.cn>
Cc: Qiang Tu <tu.qiang35@zte.com.cn>
Cc: wangyong <wang.yong12@zte.com.cn>
Cc: xu xin <xu.xin16@zte.com.cn>
Cc: Yang Yang <yang.yang29@zte.com.cn>
Cc: ye xingchen <ye.xingchen@zte.com.cn>
Cc: Yunkai Zhang <zhang.yunkai@zte.com.cn>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
|