From: Andrea Arcangeli <andrea@qumranet.com>
To: Avi Kivity <avi@qumranet.com>
Cc: kvm-devel@lists.sourceforge.net
Subject: Re: fx_init schedule in atomic
Date: Fri, 2 May 2008 17:19:17 +0200 [thread overview]
Message-ID: <20080502151917.GM8150@duo.random> (raw)
In-Reply-To: <481ADEC0.60602@qumranet.com>
On Fri, May 02, 2008 at 12:28:32PM +0300, Avi Kivity wrote:
> Applied, thanks. Dynamic allocation for the fpu state was introduced in
> 2.6.26-rc, right?
It seems very recent, hit mainline on 30 Apr.
Also we may want to think if there's something cheaper than fx_save to
trigger a math exception that doesn't alter the fpu state, I didn't
think much about it given it's such a slow path that's probably not
worth changing with something more complicated anyway. And bringing in
a few l1 exclusive cachelines in the cpu should allow the second
instruction to repeat faster than the first.
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next prev parent reply other threads:[~2008-05-02 15:19 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-05-01 16:43 fx_init schedule in atomic Andrea Arcangeli
2008-05-02 9:28 ` Avi Kivity
2008-05-02 15:19 ` Andrea Arcangeli [this message]
2008-05-04 13:03 ` Avi Kivity
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