Date: Wed, 4 Aug 2004 16:34:03 -0400 From: John Baldwin <jhb@FreeBSD.org> To: src-committers@FreeBSD.org Cc: cvs-all@FreeBSD.org Subject: Re: cvs commit: src/sys/i386/i386 pmap.c src/sys/kern subr_witness.c Message-ID: <200408041634.03998.jhb@FreeBSD.org> In-Reply-To: <200408042031.i74KVKUf039025@repoman.freebsd.org> References: <200408042031.i74KVKUf039025@repoman.freebsd.org>
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On Wednesday 04 August 2004 04:31 pm, John Baldwin wrote: > jhb 2004-08-04 20:31:19 UTC > > FreeBSD src repository > > Modified files: > sys/i386/i386 pmap.c > sys/kern subr_witness.c > Log: > Remove a potential deadlock on i386 SMP by changing the lazypmap ipi and > spin-wait code to use the same spin mutex (smp_tlb_mtx) as the TLB ipi > and spin-wait code snippets so that you can't get into the situation of > one CPU doing a TLB shootdown to another CPU that is doing a lazy pmap > shootdown each of which are waiting on each other. With this change, > only one of the CPUs would do an IPI and spin-wait at a time. Both this patch and the previous I have tested locally and also sent out to current@ for testing. However, I received zero feedback (not even useless feedback), so they may theoretically be risky. -- John Baldwin <jhb@FreeBSD.org> <>< http://www.FreeBSD.org/~jhb/ "Power Users Use the Power to Serve" = http://www.FreeBSD.org
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