Date: Fri, 3 Aug 2001 14:34:17 -0400 (EDT) From: Zhihui Zhang <zzhang@cs.binghamton.edu> To: freebsd-hackers@FreeBSD.ORG Subject: Re: Allocate a page at interrupt time Message-ID: <Pine.SOL.4.21.0108031432070.28997-100000@opal> In-Reply-To: <Pine.SOL.4.21.0108021445330.1316-100000@opal>
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I should have guessed the reason. Matthew Dillon answered this question on
Fri, 2 Jun 2000 as follows:
The VM routines that manage pages associated with objects are not
protected against interrupts, so interrupts aren't allowed to change
page-object associations. Otherwise an interrupt at just the wrong
time could corrupt the mainline kernel VM code.
On Thu, 2 Aug 2001, Zhihui Zhang wrote:
>
> FreeBSD can not allocate from the PQ_CACHE queue in an interrupt context.
> Can anyone explain it to me why this is the case?
>
>
> Thanks,
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