linux-kernel - Re: sched: hang in migrate

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Message-ID: <20140224131025.GG3104@twins.programming.kicks-ass.net>
Date:	Mon, 24 Feb 2014 14:10:25 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Michael wang <wangyun@...ux.vnet.ibm.com>
Cc:	Sasha Levin <sasha.levin@...cle.com>,
	Ingo Molnar <mingo@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: sched: hang in migrate_swap

On Mon, Feb 24, 2014 at 01:12:18PM +0100, Peter Zijlstra wrote:
> +		if (p) {
> +			if (unlikely(p == RETRY_TASK))
> +				goto again;

We could even make that: unlikely(p & 1), I think most CPUs can encode
that far better than the full pointer immediate.
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