Date: Sat, 17 Mar 2012 17:14:34 -0500 From: Nathan Whitehorn <nwhitehorn@freebsd.org> To: Alan Cox <alc@FreeBSD.org> Cc: svn-src-head@freebsd.org, svn-src-all@freebsd.org, src-committers@freebsd.org Subject: Re: svn commit: r233097 - head/sys/amd64/amd64 Message-ID: <A64E77A8-291B-4DD9-9271-015DE8069F77@freebsd.org> In-Reply-To: <201203172204.q2HM4xBH088986@svn.freebsd.org> References: <201203172204.q2HM4xBH088986@svn.freebsd.org>
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On Mar 17, 2012, at 5:04 PM, Alan Cox wrote: > Author: alc > Date: Sat Mar 17 22:04:58 2012 > New Revision: 233097 > URL: http://svn.freebsd.org/changeset/base/233097 > > Log: > With the changes over the past year to how accesses to the page's > dirty > field are synchronized, there is no need for pmap_protect() to > acquire > the page queues lock unless it is going to access the pv lists. > > Reviewed by: kib Under what circumstances does the page queue lock actually have to be held? It looks like from this that I can remove the page queue lock from the PPC/AIM pmap_protect() completely, but I don't have a good sense of it. -Nathan
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