Date: Thu, 21 Jan 1999 22:05:09 -0800 (PST) From: Matt Dillon <dillon@FreeBSD.ORG> To: cvs-committers@FreeBSD.ORG, cvs-all@FreeBSD.ORG Subject: cvs commit: src/sys/vm vm_pageout.c Message-ID: <199901220605.WAA00152@freefall.freebsd.org>
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dillon 1999/01/21 22:05:09 PST
Modified files: (Branch: RELENG_3)
sys/vm vm_pageout.c
Log:
Backport from -4.x.
We cannot call vm_object_collapse() here because it could block and
we are not holding any locks on our vm_object or vm_page_t. If it
were to block, the system might shred the objects that we assume remain
consistent.
John Dyson is not 100% sure that VM objects are collapsed properly
in all cases ( i.e. 'garbage collected' ), and this code was originally
put in to solve a related problem. For now we assume that VM objects
are collapsed properly. If it turns out they are not, we will fix
that problem. The problem this patch fixes, however, could cause a crash
and must be fixed now.
Revision Changes Path
1.129.2.1 +7 -2 src/sys/vm/vm_pageout.c
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