* [Bug tapsets/26397] New: Modern kernels no longer use cputime for task->utime and task->stime
@ 2020-08-16 20:09 agentzh at gmail dot com
2020-08-16 20:09 ` [Bug tapsets/26397] " agentzh at gmail dot com
0 siblings, 1 reply; 2+ messages in thread
From: agentzh at gmail dot com @ 2020-08-16 20:09 UTC (permalink / raw)
To: systemtap
https://sourceware.org/bugzilla/show_bug.cgi?id=26397
Bug ID: 26397
Summary: Modern kernels no longer use cputime for task->utime
and task->stime
Product: systemtap
Version: unspecified
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: tapsets
Assignee: systemtap at sourceware dot org
Reporter: agentzh at gmail dot com
Target Milestone: ---
The task_time_string() tapset function assumes task->{utime,stime} to be
cputime (or jiffies), which leads to very wrong results being returned. Modern
kernels already use nanoseconds for these two fields.
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* [Bug tapsets/26397] Modern kernels no longer use cputime for task->utime and task->stime
2020-08-16 20:09 [Bug tapsets/26397] New: Modern kernels no longer use cputime for task->utime and task->stime agentzh at gmail dot com
@ 2020-08-16 20:09 ` agentzh at gmail dot com
0 siblings, 0 replies; 2+ messages in thread
From: agentzh at gmail dot com @ 2020-08-16 20:09 UTC (permalink / raw)
To: systemtap
https://sourceware.org/bugzilla/show_bug.cgi?id=26397
--- Comment #1 from agentzh <agentzh at gmail dot com> ---
Not sure how to add a stap feature test for this kernel change.
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2020-08-16 20:09 [Bug tapsets/26397] New: Modern kernels no longer use cputime for task->utime and task->stime agentzh at gmail dot com
2020-08-16 20:09 ` [Bug tapsets/26397] " agentzh at gmail dot com
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