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Date:      Mon, 19 Apr 1999 12:01:34 -0400 (EDT)
From:      Zhihui Zhang <zzhang@cs.binghamton.edu>
To:        Matthew Dillon <dillon@apollo.backplane.com>
Cc:        hackers@FreeBSD.ORG
Subject:   Re: Directories not VMIO cached at all!
Message-ID:  <Pine.GSO.3.96.990419115249.20311A-100000@sol.cs.binghamton.edu>
In-Reply-To: <199904171844.LAA75452@apollo.backplane.com>

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I tried to apply your patch to FreeBSD 2.2.8.  I only made changes to file
vfs_subr.c (vfs_object_create()) and vfs_vnops.c (vn_open()) because I can
not find the corresponding places in file vfs_lookup.c and vfs_syscalls.c.

After this, I made a new kernel and reboot.  I issue the following
command:

 # find /usr/src -name "*.?" -exec grep "dummy" /dev/null {} \;

It takes about five minutes as it did before I modified the kernel and
reboot.  So obviously the modifications I made are not enough.  I should
change something else to really use it.  Can you please tell me where to
look at in 2.2.8? Somewhere in namei()?

I believe your idea is a good one because it may help to solve the
directory layout problem when you do depth-first search of directories (as
in find?).  The reason I need it now is that each time I spend 5 minutes
to search for a symbol in the source code tree under /usr/src. 

Thanks for your help.

-Zhihui



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