Date: Tue, 13 Mar 2001 22:48:54 -0800 (PST) From: Matt Dillon <dillon@FreeBSD.org> To: cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org Subject: cvs commit: src/sys/vm vm_fault.c vm_map.c vm_map.h Message-ID: <200103140648.f2E6msK57981@freefall.freebsd.org>
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dillon 2001/03/13 22:48:54 PST
Modified files:
sys/vm vm_fault.c vm_map.c vm_map.h
Log:
Fix a lock reversal problem in the VM subsystem related to threaded
programs. There is a case during a fork() which can cause a deadlock.
From Tor -
The workaround that consists of setting a flag in the vm map that
indicates that a fork is in progress and using that mark in the page
fault handling to force a revalidation failure. That change will only
affect (pessimize) page fault handling during fork for threaded
(linuxthreads style) applications and applications using aio_*().
Submited by: tegge
Revision Changes Path
1.117 +7 -1 src/sys/vm/vm_fault.c
1.197 +4 -1 src/sys/vm/vm_map.c
1.58 +2 -1 src/sys/vm/vm_map.h
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