linux-kernel - Re: [PATCH] KVM x86: remove memset, use vzalloc and don't assign the same value to a variable twice

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Message-ID: <alpine.LNX.2.00.1011020509590.11973@swampdragon.chaosbits.net>
Date:	Tue, 2 Nov 2010 05:11:19 +0100 (CET)
From:	Jesper Juhl <jj@...osbits.net>
To:	Takuya Yoshikawa <yoshikawa.takuya@....ntt.co.jp>
cc:	kvm@...r.kernel.org, Avi Kivity <avi@...hat.com>,
	Marcelo Tosatti <mtosatti@...hat.com>,
	linux-kernel@...r.kernel.org, Alexander Graf <agraf@...e.de>
Subject: Re: [PATCH] KVM x86: remove memset, use vzalloc and don't assign
 the same value to a variable twice

On Tue, 2 Nov 2010, Takuya Yoshikawa wrote:

> Hi Jesper, (dropped some addresses from Cc)
> 
> > > Jesper Juhl wrote:
> > There's definately a positive size impact for the generated object code 
> > and we save having to do the call to memset() and the cost of a vzalloc() 
> > call looks more or less the same as a call to vmalloc() to me.
> 
> > > This patch is not based on kvm.git, I guess.
> > > 
> > Nope. It was generated against mainline git as of a couple of days ago. I 
> > can generate a version against kvm.git if you prefer.
> 
> Sorry, I should have said more clearly.
> 
> kvm_vm_ioctl_get_dirty_log() has been changed since latest mainline kernel was released.
> Furthermore, vmalloc() in it is to be removed soon, currently in kvm's next.
> 
> I have checked all vmalloc() + memset() in kvm, and there are three remaining.
> See the patch below.
>   - I have tested on x86.
>   - I can test ppc later if needed, but this is so trivial that Alex will see
>     no problem about this, probably.
> 
> So please write your Signed-off-by and ask Avi and Marcelo to apply.
> 
> Thanks,
>   Takuya
> 
> ===
> Subject: [PATCH] KVM: replace vmalloc and memset with vzalloc
> 
> Let's use newly introduced vzalloc().
> 
> Signed-off-by: Takuya Yoshikawa <yoshikawa.takuya@....ntt.co.jp>

Signed-off-by: Jesper-juhl <jj@...osbits.net>


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Jesper Juhl <jj@...osbits.net>             http://www.chaosbits.net/
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