linux-kernel - Re: Experiencing freezes with kernel 4.16.3 on a desktop with E5500 CPU (bisect included)

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Message-ID: <CA+ToGPEwvkn9URS+E_vEPrSjKXbtq2KLwt04z2uxVWcTTs=oSw@mail.gmail.com>
Date:   Mon, 23 Apr 2018 11:02:12 -0300
From:   Diego Viola <diego.viola@...il.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     linux-kernel@...r.kernel.org, tglx@...utronix.de,
        len.brown@...el.com, rui.zhang@...el.com,
        "Rafael J. Wysocki" <rjw@...ysocki.net>
Subject: Re: Experiencing freezes with kernel 4.16.3 on a desktop with E5500
 CPU (bisect included)

On Mon, Apr 23, 2018 at 11:00 AM, Peter Zijlstra <peterz@...radead.org> wrote:
> On Mon, Apr 23, 2018 at 02:38:47PM +0200, Peter Zijlstra wrote:
>> @@ -834,8 +857,12 @@ static int clocksource_unbind(struct clocksource *cs)
>>               if (curr_clocksource == cs)
>>                       return -EBUSY;
>>       }
>> +
>> +     clocksource_watchdog_lock(&flags);
>>       clocksource_dequeue_watchdog(cs);
>>       list_del_init(&cs->list);
>> +     clocksource_watchdog_lock(&flags);
>
> It works a lot better when this is _unlock();
>
>> +
>>       return 0;
>>  }
>>
>
> With that, and intel_idle.c modified to always issue the "halts in
> idle" thing, my IVB comes up in hpet mode. Let me dig up a Core2 era
> machine and see if that works too.

OK, thanks.