Date: Sun, 1 Feb 2004 14:53:00 -0600 From: Alan Cox <alc@cs.rice.edu> To: Alan Cox <alc@FreeBSD.org> Cc: cvs-all@FreeBSD.org Subject: Re: cvs commit: src/sys/i386/i386 pmap.c Message-ID: <20040201205300.GC22987@cs.rice.edu> In-Reply-To: <200402012014.i11KE1PD082693@repoman.freebsd.org> References: <200402012014.i11KE1PD082693@repoman.freebsd.org>
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On Sun, Feb 01, 2004 at 12:14:01PM -0800, Alan Cox wrote: > alc 2004/02/01 12:14:01 PST > > FreeBSD src repository > > Modified files: > sys/i386/i386 pmap.c > Log: > Eliminate all TLB shootdowns by pmap_pte_quick(): By temporarily pinning > the thread that calls pmap_pte_quick() and by virtue of the page queues > lock being held, we can manage PADDR1/PMAP1 as a CPU private mapping. > > The most common effect of this change is to reduce the overhead of the page > daemon on multiprocessors. > > In collaboration with: tegge > > Revision Changes Path > 1.462 +52 -13 src/sys/i386/i386/pmap.c If you want to see the number of IPIs for TLB shootdown that are avoided on an SMP, run "sysctl debug.PMAP1changed". After running a buildworld "-j4" on a machine configured with 148MB, I got debug.PMAP1changed: 3148562
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