linux-kernel - Re: [patch 13/26] Xen-paravirt_ops: Consistently wrap paravirt ops callsites to make them patchable

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Message-ID: <20070319184137.GB10574@sequoia.sous-sol.org>
Date:	Mon, 19 Mar 2007 11:41:37 -0700
From:	Chris Wright <chrisw@...s-sol.org>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	Rusty Russell <rusty@...tcorp.com.au>, Andi Kleen <ak@....de>,
	David Miller <davem@...emloft.net>, jeremy@...p.org,
	mingo@...e.hu, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org, virtualization@...ts.osdl.org,
	xen-devel@...ts.xensource.com, chrisw@...s-sol.org,
	zach@...are.com, anthony@...emonkey.ws,
	torvalds@...ux-foundation.org, netdev@...r.kernel.org
Subject: Re: [patch 13/26] Xen-paravirt_ops: Consistently wrap paravirt ops callsites to make them patchable

* Eric W. Biederman (ebiederm@...ssion.com) wrote:
> Is it truly critical to inline any of these instructions?

I don't have any current measurements.  But we'd been aiming
at getting irq_{en,dis}able to a simple memory write to pda.
But simplicity, maintenance, etc. win over trimming a couple
cycles, so still worth real look.

thanks,
-chris
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