linux-kernel - filp usage when cpu busy

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Message-ID: <47293248.9000906@cisco.com>
Date:	Wed, 31 Oct 2007 18:56:24 -0700
From:	"bc Wong (chimwong)" <bcwong@...co.com>
To:	linux-kernel@...r.kernel.org
Subject: filp usage when cpu busy

Hi,

With 2.6.16 x86_64 on a 4 core machine, I noticed
that the filp usage (according to /proc/slabinfo)
shoots up and keeps on increasing sharply when one
of the CPUs is (1) locked up, or (2) very busy
doing a lot of printk()'s with KERN_EMERG.

In the case of (1), it's permanent until it runs
out of memory eventually. For (2), it's temporary;
filp count comes back down when the printk()'s are
done.

I can't think of any relationship between a busy/
locked-up CPU and filp count. The system is still
functional. New short-lived processes kept being
created, but the overall number of processes is
stable.

Does anyone know why filp count would go up like
that?

Thanks,
bc
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