From owner-freebsd-arch  Sat Feb 23  7:56:41 2002
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Date: Sun, 24 Feb 2002 00:56:08 +0900
From: Seigo Tanimura <tanimura@r.dl.itc.u-tokyo.ac.jp>
To: arch@FreeBSD.org
Subject: reclaiming v_data of free vnodes
Cc: Seigo Tanimura <tanimura@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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