linux-kernel - Re: [RFC][PATCH 12/13] stop

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Date:	Wed, 24 Jun 2015 19:29:24 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:	Oleg Nesterov <oleg@...hat.com>, tj@...nel.org, mingo@...hat.com,
	linux-kernel@...r.kernel.org, der.herr@...r.at, dave@...olabs.net,
	riel@...hat.com, viro@...IV.linux.org.uk,
	torvalds@...ux-foundation.org
Subject: Re: [RFC][PATCH 12/13] stop_machine: Remove lglock

On Wed, Jun 24, 2015 at 10:20:18AM -0700, Paul E. McKenney wrote:
> Except that I promised Ingo I would check for CPUs failing to schedule
> quickly enough, which means that I must track them individually rather
> than via a single counter...

You can track individual CPUs timestamps by extending the per-cpu
storage we use for the exp_stop_work.
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