Date: Sun, 24 Feb 2002 00:56:08 +0900 From: Seigo Tanimura <tanimura@r.dl.itc.u-tokyo.ac.jp> To: arch@FreeBSD.org Cc: Seigo Tanimura <tanimura@r.dl.itc.u-tokyo.ac.jp> Subject: reclaiming v_data of free vnodes Message-ID: <200202231556.g1NFu9N9040749@silver.carrots.uucp.r.dl.itc.u-tokyo.ac.jp>
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Thanks to vnlru, cvsup.jp.FreeBSD.org is keeping the number of vnodes
to quite sane value. (about 330K out of which 190K are in use)
The next problem is the overuse of v_data. vmstat(1) at the uptime of
about 24 hours says:
Type InUse MemUse HighUse Limit Requests Limit Limit Size(s)
FFS node323549 80888K 80897K102400K 29347661 0 0 256
which is almost the same as the number of the total vnodes. (in
cvsup.jp.FreeBSD.org, almost all in-use vnodes are actually inodes)
This seems due to vrele() and vput() not calling VOP_RECLAIM(). One
solution is to always reclaim a vnode in vrele()/vput(), while we can
also run a kernel thread to scan the free vnodes and reclaim some of
them. Which one would be better, or are there any other ways?
Any comments are welcome.
--
Seigo Tanimura <tanimura@r.dl.itc.u-tokyo.ac.jp> <tanimura@FreeBSD.org>
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