Bug 1980715

Summary: RFE: [scheduler] plug-in: exclude processes based on cgroup
Product: Red Hat Enterprise Linux 9 Reporter: Jiří Mencák <jmencak>
Component: tunedAssignee: Jaroslav Škarvada <jskarvad>
Status: CLOSED CURRENTRELEASE QA Contact: Robin Hack <rhack>
Severity: high Docs Contact:
Priority: high    
Version: 9.0CC: jeder, jskarvad, jzerdik
Target Milestone: betaKeywords: FutureFeature, Patch, TestCaseNeeded, TestCaseProvided, Triaged
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
URL: https://github.com/redhat-performance/tuned/pull/368
Whiteboard:
Fixed In Version: tuned-2.16.0-3.el9 Doc Type: If docs needed, set a value
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2021-12-07 21:42:00 UTC Type: Bug
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On:    
Bug Blocks: 1979352    

Description Jiří Mencák 2021-07-09 11:16:26 UTC 
Description of problem:
The [scheduler] plug-in has support for (black|white)listing processes by the 'ps_(black|white)list' options.  The (ex|in)clusion is implemented based on regular expression matching process names.  We need a similar mechanism mostly to exclude processes from the [scheduler] plug-in based on cgroup names.  Process inclusion (whitelisting) might also be useful.  Both cgroups v1 and v2 need to be supported.  For cgroups v1, regular expression matching should likely be performed for all the hierarchies, i.e. multi-line matching in the /proc/PID/cgroup file.

Proposed syntax:
[scheduler]
#cgroup_ps_whitelist=.*  # by default, whitelist matches all processes
cgroup_ps_blacklist=/kubepods\.slice/

should exclude processes such as:
$ grep ^1: /proc/4334/cgroup
1:name=systemd:/kubepods.slice/kubepods-burstable.slice/kubepods-burstable-pod73ea0596_5e4c_4310_b3cf_c14c15ea3cfc.slice/crio-8b2fd8a97c19123fbb6a8bf4feefddb9a87aa2b1ba8b7009b94f73fcab270007.scope

Additional info:
Original BZ that prompted the need for this feature:
https://bugzilla.redhat.com/show_bug.cgi?id=1979352
Comment 2 Jaroslav Škarvada 2021-07-15 19:35:27 UTC 
Upstream PR:
https://github.com/redhat-performance/tuned/pull/368