linux-kernel - Re: sched: hang in migrate

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Message-ID: <530C2045.1090704@linux.vnet.ibm.com>
Date:	Tue, 25 Feb 2014 12:47:01 +0800
From:	Michael wang <wangyun@...ux.vnet.ibm.com>
To:	Peter Zijlstra <peterz@...radead.org>
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 02/24/2014 09:10 PM, Peter Zijlstra wrote:
> 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.

Agree, unless odd-align stuff appeared...

Regards,
Michael Wang

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