linux-kernel - Re: [PATCH 3/4 changelog-v2] KVM: Switch to srcu-less get_dirty

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Message-ID: <20120307232056.GA29570@amt.cnet>
Date:	Wed, 7 Mar 2012 20:20:56 -0300
From:	Marcelo Tosatti <mtosatti@...hat.com>
To:	Takuya Yoshikawa <yoshikawa.takuya@....ntt.co.jp>
Cc:	Takuya Yoshikawa <takuya.yoshikawa@...il.com>, avi@...hat.com,
	kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/4 changelog-v2] KVM: Switch to srcu-less get_dirty_log()

On Wed, Mar 07, 2012 at 05:18:26PM +0900, Takuya Yoshikawa wrote:
> Marcelo Tosatti <mtosatti@...hat.com> wrote:
> 
> > > We cannot drop the lock.
> > > Do you mean doing TLB flush each time before dropping the lock?
> > 
> > Yes, only if there is contention (see cond_resched_lock).
> 
> But how can we conditionally call kvm_flush_remote_tlbs() from
> inside __cond_resched_lock right before spin_unlock()?
>
> We need another API.

Yep, a callback into cond_resched_lock_cb (or something) 
could do it.

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