Date: Wed, 12 Oct 2005 01:41:48 +0000 (UTC) From: Stephan Uphoff <ups@FreeBSD.org> To: src-committers@FreeBSD.org, cvs-src@FreeBSD.org, cvs-all@FreeBSD.org Subject: cvs commit: src/sys/i386/i386 vm_machdep.c Message-ID: <200510120141.j9C1fm4N089483@repoman.freebsd.org>
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ups 2005-10-12 01:41:48 UTC FreeBSD src repository Modified files: sys/i386/i386 vm_machdep.c Log: Ensure that a thread stays on same CPU when calculating per CPU TLB shootdown requirements. Otherwise a CPU may not get the needed TLB invalidation. The PTE valid and access flags can not be used here to avoid TLB shootdowns unless sf->cpumask == all_cpus. ( Otherwise some CPUs may still hold an even older entry in the TLB) Since sf_buf_alloc mappings are normally always used this is also not really useful and presetting accessed and modified allows the CPU to speculatively load the entry into the TLB. Both bugs can cause random data corruption. MFC after: 3 days Revision Changes Path 1.261 +15 -15 src/sys/i386/i386/vm_machdep.c
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