Date: Sat, 17 Apr 2010 17:02:17 +0000 (UTC) From: Alan Cox <alc@FreeBSD.org> To: cvs-src-old@freebsd.org Subject: cvs commit: src/sys/vm swap_pager.c Message-ID: <201004171702.o3HH2VCK059673@repoman.freebsd.org>
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alc 2010-04-17 17:02:17 UTC
FreeBSD src repository
Modified files:
sys/vm swap_pager.c
Log:
SVN rev 206761 on 2010-04-17 17:02:17Z by alc
Setting PG_REFERENCED on the requested page in swap_pager_getpages() is
either redundant or harmful, depending on the caller. For example, when
called by vm_fault(), it is redundant. However, when called by
vm_thread_swapin(), it is harmful. Specifically, if the thread is later
swapped out, having PG_REFERENCED set on its stack pages leads the page
daemon to reactivate these stack pages and delay their reclamation.
Reviewed by: kib
MFC after: 3 weeks
Revision Changes Path
1.315 +1 -5 src/sys/vm/swap_pager.c
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