From: Ivid Suvarna <ivid.suvarna@gmail.com>
To: Kernel development list <linux-kernel@vger.kernel.org>,
kernelnewbies@kernelnewbies.org
Subject: Softlockup and Hardlockup sample test module
Date: Sun, 15 Apr 2018 05:41:35 +0000 [thread overview]
Message-ID: <CABXF_ADbsQUFa4u0iG=nUYgWUtYa_pnwQghsU49zk+xVag3_vQ@mail.gmail.com> (raw)
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Hi All,
Could you please provide some sample test module for causing a Softlockup
and Hardlockup in latest kernel for SMP for only testing purposes. I assume
there are some Kconfigs to be enabled as well for this.
I had tried with the module where I put a busy loop inside spinlock but was
not able to cause any lockups. Maybe this is because of SMP which schedule
the job to other CPU. "How do I make a task to run on single CPU only?"
I only get RCU stalls sometimes instead of softlockup when I use busy loop
inside a spinlock. Is there any explanation for difference between these
stalls and softlockup.
Thanks,
IVID
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From: ivid.suvarna@gmail.com (Ivid Suvarna)
To: kernelnewbies@lists.kernelnewbies.org
Subject: Softlockup and Hardlockup sample test module
Date: Sun, 15 Apr 2018 05:41:35 +0000 [thread overview]
Message-ID: <CABXF_ADbsQUFa4u0iG=nUYgWUtYa_pnwQghsU49zk+xVag3_vQ@mail.gmail.com> (raw)
Hi All,
Could you please provide some sample test module for causing a Softlockup
and Hardlockup in latest kernel for SMP for only testing purposes. I assume
there are some Kconfigs to be enabled as well for this.
I had tried with the module where I put a busy loop inside spinlock but was
not able to cause any lockups. Maybe this is because of SMP which schedule
the job to other CPU. "How do I make a task to run on single CPU only?"
I only get RCU stalls sometimes instead of softlockup when I use busy loop
inside a spinlock. Is there any explanation for difference between these
stalls and softlockup.
Thanks,
IVID
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next reply other threads:[~2018-04-15 5:41 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-04-15 5:41 Ivid Suvarna [this message]
2018-04-15 5:41 ` Softlockup and Hardlockup sample test module Ivid Suvarna
2018-04-15 6:31 Ivid Suvarna
2018-04-15 7:47 Ivid Suvarna
2018-04-15 7:47 ` Ivid Suvarna
2018-04-15 19:12 ` valdis.kletnieks
2018-04-15 19:12 ` valdis.kletnieks at vt.edu
2018-04-15 22:19 ` Cong Wang
2018-04-15 22:19 ` Cong Wang
2018-05-06 18:13 ` NiftyLinKern Mitchell
2018-05-06 18:36 ` NiftyLinKern Mitchell
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