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From: Paul Menage <pmenage@ensim.com>
To: Alexander Viro <viro@math.psu.edu>
cc: LKML <linux-kernel@vger.kernel.org>,
       lse-tech <lse-tech@lists.sourceforge.net>
Subject: Re: [Lse-tech] Re: [RFC] dcache scalability patch (2.4.17) 
cc: pmenage@ensim.com
In-reply-to: Your message of "Sat, 13 Jul 2002 13:33:10 EDT."
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Date: Sat, 13 Jul 2002 10:51:10 -0700
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>
>
>On Sat, 13 Jul 2002, Paul Menage wrote:
>
>> - accessing foo/../bar, won't mark foo as referenced, even though it
>> might be being referenced frequently. Probably not a common case for foo
>> to be accessed exclusively in this way, but it could be fixed by marking
>> a dentry referenced when following ".."
>
>It certainly will.  Look - until ->d_count hits zero referenced bit is
>not touched or looked at.  At all.
>
>Look at the code.  There is _no_ aging for dentries with positive ->d_count.
>They start aging only when after they enter unused_list...
>

Yes, but with the fastwalk lookup, accessing foo/../bar won't do a
dget() for foo (assuming it was cached), and hence will never do a
dput() on it either. So if the only references to foo are as foo/../bar
then its d_count will stay zero and it will never be marked referenced.
(Or am I missing something?)

Paul

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