From: "Valdis Klētnieks" <valdis.kletnieks@vt.edu>
To: 孙世龙 sunshilong <sunshilong369@gmail.com>
Cc: kernelnewbies <Kernelnewbies@kernelnewbies.org>
Subject: Re: How can I investigate the cause of "watchdog: BUG: soft lockup"?
Date: Sat, 04 Jul 2020 04:09:41 -0400 [thread overview]
Message-ID: <44849.1593850181@turing-police> (raw)
In-Reply-To: <CAAvDm6ZWWgzR9qha4JS5=CSR5Gxm5SgpYKiNAYh+rY7xJOEjuQ@mail.gmail.com>
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> Can I draw the conclusion that continually acquiring the spinlock causes the soft
> lockup and the CPU has been stuck for 22s?
> Can I think in this way?
No. It's been stuck for 22s *TRYING* and *FAILING* to get the spinlock.
For comparison - spinlocks are usually used when you need a lock, but the
code protected by the lock is short (things like adding to a linked list, etc),
so it should again become available in milliseconds - things where it would take
longer to put this thread to sleep and wake another one up than we expect
to be waiting for this lock.
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next prev parent reply other threads:[~2020-07-04 8:10 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-04 2:20 How can I investigate the cause of "watchdog: BUG: soft lockup"? 孙世龙 sunshilong
2020-07-04 4:39 ` Valdis Klētnieks
2020-07-04 7:51 ` 孙世龙 sunshilong
2020-07-04 8:09 ` Valdis Klētnieks [this message]
2020-07-04 9:04 ` 孙世龙 sunshilong
2020-07-04 9:13 ` 孙世龙 sunshilong
2020-07-08 5:19 ` 孙世龙 sunshilong
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