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From: David Miller <davem@davemloft.net>
To: EladN@gilat.com
Cc: netdev@vger.kernel.org
Subject: Re: Kernel 4.6.7-rt14 kernel workqueue lockup - rtnl deadlock plus syscall endless loop
Date: Tue, 17 Jan 2017 14:05:52 -0500 (EST)	[thread overview]
Message-ID: <20170117.140552.539738967862859087.davem@davemloft.net> (raw)
In-Reply-To: <AM5PR0701MB1873F82D61AF17A09F2B0E26A07C0@AM5PR0701MB1873.eurprd07.prod.outlook.com>

From: Elad Nachman <EladN@gilat.com>
Date: Tue, 17 Jan 2017 18:15:19 +0000

> Any thought about limiting the amount of busy polling?  Say if more
> than X polls are done within a jiffy, then at least for preemptable
> kernels you can sleep for a jiffy inside the syscall to yield the
> CPU for a while?

We cannot yield there, because we must return immediately from this
context in order to drop the sysctl locks and references.

  reply	other threads:[~2017-01-17 19:05 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-01-17 17:39 Kernel 4.6.7-rt14 kernel workqueue lockup - rtnl deadlock plus syscall endless loop Elad Nachman
2017-01-17 17:53 ` Stephen Hemminger
2017-01-17 17:57 ` David Miller
2017-01-17 18:15   ` Elad Nachman
2017-01-17 19:05     ` David Miller [this message]
2017-01-18  9:57       ` Elad Nachman

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