linux-kernel - Re: [PATCH V2] kernel/watchdog: fix spurious hard lockups

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Message-ID: <20170627234822.GL23705@tassilo.jf.intel.com>
Date:   Tue, 27 Jun 2017 16:48:22 -0700
From:   Andi Kleen <ak@...ux.intel.com>
To:     "Liang, Kan" <kan.liang@...el.com>
Cc:     Don Zickus <dzickus@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "mingo@...nel.org" <mingo@...nel.org>,
        "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
        "babu.moger@...cle.com" <babu.moger@...cle.com>,
        "atomlin@...hat.com" <atomlin@...hat.com>,
        "prarit@...hat.com" <prarit@...hat.com>,
        "torvalds@...ux-foundation.org" <torvalds@...ux-foundation.org>,
        "peterz@...radead.org" <peterz@...radead.org>,
        "eranian@...gle.com" <eranian@...gle.com>,
        "acme@...hat.com" <acme@...hat.com>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
Subject: Re: [PATCH V2] kernel/watchdog: fix spurious hard lockups

> I haven't heard back any test result yet.
> 
> The above patch looks good to me.

This needs performance testing.  It may slow down performance or latency sensitive workloads.

> Which workaround do you prefer, the above one or the one checking timestamp?

I prefer the earlier patch, it has far less risk of performance issues.

-Andi