linux-kernel - Re: [locking/ww_mutex] f2a5fec173 EIP: __mutex

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Message-ID: <20170228085333.GF10304@nuc-i3427.alporthouse.com>
Date:   Tue, 28 Feb 2017 08:53:33 +0000
From:   Chris Wilson <chris@...is-wilson.co.uk>
To:     Fengguang Wu <fengguang.wu@...el.com>
Cc:     Nicolai Hähnle <Nicolai.Haehnle@....com>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org,
        LKP <lkp@...org>
Subject: Re: [locking/ww_mutex] f2a5fec173 EIP: __mutex_trylock

On Tue, Feb 28, 2017 at 11:59:24AM +0800, Fengguang Wu wrote:
> Hello,
> 
> Here is another bisect result with a different call trace.

Is this a single processor VM without pre-emption? It's a busy spin
loop, so relies on the other thread being run to break the loop. That
cpu_relax() should become cond_resched()?
-Chris


-- 
Chris Wilson, Intel Open Source Technology Centre