Message-ID: <1335869998.13683.135.camel@twins>
Subject: Re: [RFC PATCH v1 3/5] KVM: Add paravirt kvm_flush_tlb_others
From: Peter Zijlstra <peterz@infradead.org>
To: Avi Kivity <avi@redhat.com>
Cc: "Nikunj A. Dadhania" <nikunj@linux.vnet.ibm.com>, mingo@elte.hu,
        jeremy@goop.org, mtosatti@redhat.com, kvm@vger.kernel.org,
        x86@kernel.org, vatsa@linux.vnet.ibm.com, linux-kernel@vger.kernel.org,
        hpa@zytor.com
Date: Tue, 01 May 2012 12:59:58 +0200
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On Tue, 2012-05-01 at 12:57 +0200, Peter Zijlstra wrote:
> Anyway, I don't have any idea about the costs involved with
> HAVE_RCU_TABLE_FREE, but I don't think its much.. otherwise these other
> platforms (PPC,SPARC) wouldn't have used it, gup_fast() is a very
> specific case, whereas mmu-gather is something affecting pretty much all
> tasks. 

Which reminds me, I thought Xen needed this too, but a git grep on
HAVE_RCU_TABLE_FREE shows its still only ppc and sparc.

Jeremy?
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