[Webkit-unassigned] [Bug 245618] New: [Linux] No thread priority demoting through rtkit portal

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Sat Sep 24 06:43:52 PDT 2022 

https://bugs.webkit.org/show_bug.cgi?id=245618

            Bug ID: 245618
           Summary: [Linux] No thread priority demoting through rtkit
                    portal
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WPE WebKit
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: philn at igalia.com
                CC: bugs-noreply at webkitgtk.org

I'm not sure if this is an issue or not... RealTimeThreads::promoteThreadToRealTime() has rtkit support. RealTimeThreads::demoteThreadFromRealTime() does not. When I run the WPE Debug tests after a while I see this in the journal:

Sep 24 14:37:50 ecto-1 rtkit-daemon[764977]: Failed to look up client: Device or resource busy
Sep 24 14:37:51 ecto-1 rtkit-daemon[764977]: Successfully made thread 789207 of process 789199 (/app/webkit/WebKitBuild/Debug/bin/WPEWebProcess) owned by '1000' RT at priority 5.
Sep 24 14:37:52 ecto-1 rtkit-daemon[764977]: Warning: Reached maximum concurrent process limit for user '1000', denying request.
Sep 24 14:37:52 ecto-1 rtkit-daemon[764977]: Failed to look up client: Device or resource busy
Sep 24 14:37:52 ecto-1 rtkit-daemon[764977]: Warning: Reached maximum concurrent process limit for user '1000', denying request.
Sep 24 14:37:52 ecto-1 rtkit-daemon[764977]: Failed to look up client: Device or resource busy
Sep 24 14:37:53 ecto-1 rtkit-daemon[764977]: Successfully made thread 789500 of process 789495 (/app/webkit/WebKitBuild/Debug/bin/WPEWebProcess) owned by '1000' RT at priority 5.
Sep 24 14:37:55 ecto-1 rtkit-daemon[764977]: Successfully made thread 789621 of process 789617 (/app/webkit/WebKitBuild/Debug/bin/WPEWebProcess) owned by '1000' RT at priority 5.
Sep 24 14:37:55 ecto-1 rtkit-daemon[764977]: Successfully made thread 789673 of process 789665 (/app/webkit/WebKitBuild/Debug/bin/WPEWebProcess) owned by '1000' RT at priority 5.
Sep 24 14:37:55 ecto-1 rtkit-daemon[764977]: Successfully made thread 789739 of process 789718 (/app/webkit/WebKitBuild/Debug/bin/WPEWebProcess) owned by '1000' RT at priority 5.
Sep 24 14:37:56 ecto-1 rtkit-daemon[764977]: Successfully made thread 789899 of process 789887 (/app/webkit/WebKitBuild/Debug/bin/WPEWebProcess) owned by '1000' RT at priority 5.
Sep 24 14:37:57 ecto-1 rtkit-daemon[764977]: Successfully made thread 789908 of process 789896 (/app/webkit/WebKitBuild/Debug/bin/WPEWebProcess) owned by '1000' RT at priority 5.
Sep 24 14:37:57 ecto-1 rtkit-daemon[764977]: Warning: Reached maximum concurrent process limit for user '1000', denying request.
Sep 24 14:37:57 ecto-1 rtkit-daemon[764977]: Failed to look up client: Device or resource busy
Sep 24 14:37:59 ecto-1 rtkit-daemon[764977]: Successfully made thread 790301 of process 790269 (/app/webkit/WebKitBuild/Debug/bin/WPEWebProcess) owned by '1000' RT at priority 5.
Sep 24 14:37:59 ecto-1 rtkit-daemon[764977]: Successfully made thread 790119 of process 790108 (/app/webkit/WebKitBuild/Debug/bin/WPEWebProcess) owned by '1000' RT at priority 5.
Sep 24 14:37:59 ecto-1 rtkit-daemon[764977]: Warning: Reached maximum concurrent process limit for user '1000', denying request.
Sep 24 14:37:59 ecto-1 rtkit-daemon[764977]: Failed to look up client: Device or resource busy
Sep 24 14:38:00 ecto-1 rtkit-daemon[764977]: Successfully made thread 790520 of process 790514 (/app/webkit/WebKitBuild/Debug/bin/WPEWebProcess) owned by '1000' RT at priority 5.
Sep 24 14:38:00 ecto-1 rtkit-daemon[764977]: Successfully made thread 790553 of process 790550 (/app/webkit/WebKitBuild/Debug/bin/WPEWebProcess) owned by '1000' RT at priority 5.
Sep 24 14:38:00 ecto-1 rtkit-daemon[764977]: Successfully made thread 790566 of process 790561 (/app/webkit/WebKitBuild/Debug/bin/WPEWebProcess) owned by '1000' RT at priority 5.
Sep 24 14:38:01 ecto-1 rtkit-daemon[764977]: Warning: Reached maximum concurrent process limit for user '1000', denying request.
Sep 24 14:38:01 ecto-1 rtkit-daemon[764977]: Failed to look up client: Device or resource busy
Sep 24 14:38:04 ecto-1 rtkit-daemon[764977]: Successfully made thread 790967 of process 790962 (/app/webkit/WebKitBuild/Debug/bin/WPEWebProcess) owned by '1000' RT at priority 5.
Sep 24 14:38:04 ecto-1 rtkit-daemon[764977]: Warning: Reached maximum concurrent process limit for user '1000', denying request.
Sep 24 14:38:04 ecto-1 rtkit-daemon[764977]: Failed to look up client: Device or resource busy
Sep 24 14:38:06 ecto-1 rtkit-daemon[764977]: Warning: Reached maximum concurrent process limit for user '1000', denying request.
Sep 24 14:38:06 ecto-1 rtkit-daemon[764977]: Failed to look up client: Device or resource busy
Sep 24 14:38:07 ecto-1 kernel: perf: interrupt took too long (4958 > 4951), lowering kernel.perf_event_max_sample_rate to 40000
Sep 24 14:38:07 ecto-1 rtkit-daemon[764977]: Successfully made thread 791308 of process 791291 (/app/webkit/WebKitBuild/Debug/bin/WPEWebProcess) owned by '1000' RT at priority 5.
Sep 24 14:38:08 ecto-1 rtkit-daemon[764977]: Warning: Reached maximum concurrent process limit for user '1000', denying request.
Sep 24 14:38:08 ecto-1 rtkit-daemon[764977]: Failed to look up client: Device or resource busy
Sep 24 14:38:10 ecto-1 rtkit-daemon[764977]: Successfully made thread 791555 of process 791545 (/app/webkit/WebKitBuild/Debug/bin/WPEWebProcess) owned by '1000' RT at priority 5.
Sep 24 14:38:11 ecto-1 rtkit-daemon[764977]: Warning: Reached maximum concurrent process limit for user '1000', denying request.
Sep 24 14:38:11 ecto-1 rtkit-daemon[764977]: Failed to look up client: Device or resource busy
Sep 24 14:38:14 ecto-1 rtkit-daemon[764977]: Successfully made thread 791896 of process 791892 (/app/webkit/WebKitBuild/Debug/bin/WPEWebProcess) owned by '1000' RT at priority 5.

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