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From: Marcelo Tosatti <mtosatti@redhat.com>
To: Alexander Graf <agraf-l3A5Bk7waGM@public.gmane.org>
Cc: kvm-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	kvm-ppc <kvm-ppc-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>
Subject: Re: [PATCH] PPC: Enable lightweight exits again
Date: Wed, 06 Jan 2010 08:54:56 +0000	[thread overview]
Message-ID: <20100106085456.GD3966@amt.cnet> (raw)
In-Reply-To: <1262639965-21489-1-git-send-email-agraf-l3A5Bk7waGM@public.gmane.org>

On Mon, Jan 04, 2010 at 10:19:25PM +0100, Alexander Graf wrote:
> The PowerPC C ABI defines that registers r14-r31 need to be preserved across
> function calls. Since our exit handler is written in C, we can make use of that
> and don't need to reload r14-r31 on every entry/exit cycle.
> 
> This technique is also used in the BookE code and is called "lightweight exits"
> there. To follow the tradition, it's called the same in Book3S.
> 
> So far this optimization was disabled though, as the code didn't do what it was
> expected to do, but failed to work.
> 
> This patch fixes and enables lightweight exits again.
> 
> Signed-off-by: Alexander Graf <agraf@suse.de>

Applied, thanks.


WARNING: multiple messages have this Message-ID (diff)
From: Marcelo Tosatti <mtosatti-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
To: Alexander Graf <agraf-l3A5Bk7waGM@public.gmane.org>
Cc: kvm-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	kvm-ppc <kvm-ppc-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>
Subject: Re: [PATCH] PPC: Enable lightweight exits again
Date: Wed, 6 Jan 2010 06:54:56 -0200	[thread overview]
Message-ID: <20100106085456.GD3966@amt.cnet> (raw)
In-Reply-To: <1262639965-21489-1-git-send-email-agraf-l3A5Bk7waGM@public.gmane.org>

On Mon, Jan 04, 2010 at 10:19:25PM +0100, Alexander Graf wrote:
> The PowerPC C ABI defines that registers r14-r31 need to be preserved across
> function calls. Since our exit handler is written in C, we can make use of that
> and don't need to reload r14-r31 on every entry/exit cycle.
> 
> This technique is also used in the BookE code and is called "lightweight exits"
> there. To follow the tradition, it's called the same in Book3S.
> 
> So far this optimization was disabled though, as the code didn't do what it was
> expected to do, but failed to work.
> 
> This patch fixes and enables lightweight exits again.
> 
> Signed-off-by: Alexander Graf <agraf-l3A5Bk7waGM@public.gmane.org>

Applied, thanks.

  parent reply	other threads:[~2010-01-06  8:54 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-01-04 21:19 [PATCH] PPC: Enable lightweight exits again Alexander Graf
2010-01-04 21:19 ` Alexander Graf
     [not found] ` <1262639965-21489-1-git-send-email-agraf-l3A5Bk7waGM@public.gmane.org>
2010-01-06  8:54   ` Marcelo Tosatti [this message]
2010-01-06  8:54     ` Marcelo Tosatti

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