linux-kernel - Re: [PATCH 1/2] SCHED: Generic hooks for trapping task preemption

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Message-Id: <1184209018.6005.706.camel@localhost.localdomain>
Date:	Thu, 12 Jul 2007 12:56:58 +1000
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Avi Kivity <avi@...ranet.com>
Cc:	kvm-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org,
	Ingo Molnar <mingo@...e.hu>, shaohua.li@...el.com
Subject: Re: [PATCH 1/2] SCHED: Generic hooks for trapping task preemption

On Wed, 2007-07-11 at 18:55 +0300, Avi Kivity wrote:
> +config PREEMPT_HOOKS
> +	bool
> +	depends on X86
> +	default y

Hmm, I would have thought that having CONFIG_KVM "select PREEMPT_HOOKS"
would be a little clearer.

> +static void fire_sched_in_preempt_hooks(struct task_struct *tsk)
> +{
> +	struct preempt_hook *hook;
> +	struct hlist_node *node;
> +
> +	hlist_for_each_entry(hook, node, &tsk->preempt_hooks, link)
> +		hook->ops->sched_in(hook, raw_smp_processor_id());
> +}

The old current/tsk conflation.  You hand in "tsk" here, but since
that's not handed through to the sched_in, it must be "current".  It's
just unfortunate that this generates better code...

But patch looks good.

Cheers,
Rusty.

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