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

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Message-Id: <200711091656.26908.ak@suse.de>
Date:	Fri, 9 Nov 2007 16:56:26 +0100
From:	Andi Kleen <ak@...e.de>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
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

On Friday 09 November 2007 01:19, Jeremy Fitzhardinge wrote:
> 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.

Yes i checked the code and only case I found is actually save_flags, not 
restore_flags

(and that particular case is even unnecessary) 

-Andi

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