linux-kernel - Re: [PATCH v3 6/6] freezer,sched: Rewrite core freezer logic

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Message-Id: <20220923072104.2013212-1-borntraeger@linux.ibm.com>
Date:   Fri, 23 Sep 2022 09:21:04 +0200
From:   Christian Borntraeger <borntraeger@...ux.ibm.com>
To:     peterz@...radead.org
Cc:     bigeasy@...utronix.de, dietmar.eggemann@....com,
        ebiederm@...ssion.com, linux-kernel@...r.kernel.org,
        linux-pm@...r.kernel.org, mgorman@...e.de, mingo@...nel.org,
        oleg@...hat.com, rjw@...ysocki.net, rostedt@...dmis.org,
        tj@...nel.org, vincent.guittot@...aro.org, will@...nel.org,
        borntraeger@...ux.ibm.com, Marc Hartmayer <mhartmay@...ux.ibm.com>
Subject: Re: [PATCH v3 6/6] freezer,sched: Rewrite core freezer logic

Peter, 

as a heads-up. This commit (bisected and verified) triggers a
regression in our KVM on s390x CI. The symptom is that a specific
testcase (start a guest with next kernel and a poky ramdisk,
then ssh via vsock into the guest and run the reboot command) now
takes much longer (300 instead of 20 seconds). From a first look
it seems that the sshd takes very long to end during shutdown
but I have not looked into that yet.
Any quick idea?

Christian