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

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Message-Id: <20120307171826.1bb12481.yoshikawa.takuya@oss.ntt.co.jp>
Date:	Wed, 7 Mar 2012 17:18:26 +0900
From:	Takuya Yoshikawa <yoshikawa.takuya@....ntt.co.jp>
To:	Marcelo Tosatti <mtosatti@...hat.com>
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()

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.

	Takuya
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