linux-kernel - Re: Some interesting observations when trying to optimize vmstat handling

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Message-ID: <4733A7A5.9000900@goop.org>
Date:	Thu, 08 Nov 2007 16:19:49 -0800
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Andi Kleen <ak@...e.de>
CC:	Christoph Lameter <clameter@....com>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org,
	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
Subject: Re: Some interesting observations when trying to optimize vmstat
 handling

Andi Kleen wrote:
> The only problem is that there might be some code who relies on 
> restore_flags() restoring other flags that IF, but at least for interrupts
> and local_irq_save/restore it should be fine to change.
>   

I don't think so.  We don't bother to save/restore the other flags in
Xen paravirt and it doesn't seem to cause a problem.  The semantics
really are specific to the state of the interrupt flag.

    J
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