Date: Fri, 2 Jun 2000 14:04:46 -0700 (PDT) From: Matthew Dillon <dillon@apollo.backplane.com> To: Joy Ganguly <joy@niksun.com> Cc: freebsd-hackers <freebsd-hackers@FreeBSD.ORG> Subject: Re: Freeing PQ_CACHE pages at interrupt time?? Message-ID: <200006022104.OAA49067@apollo.backplane.com> References: <3938141E.E2F1620F@falcon.niksun.com>
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:hi all,
:
:Why cant pages in the PQ_CACHE queue be freed at interrupt time. as far
:as i could see these pages are clean, though they are still associated
:with the object. So what prevents us from dissociating them from the
:object . we dont have to do any io and hence not block.
:
:well maybe i am missing something here. will somebody please explain it
:to me??
:
:thanx in advance
:
:joy
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.
-Matt
Matthew Dillon
<dillon@backplane.com>
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