Messages in this thread | | | Date | Mon, 10 May 2004 02:46:58 -0700 | From | Andrew Morton <> | Subject | Re: dentry bloat. |
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Arjan van de Ven <arjanv@redhat.com> wrote: > > On Mon, 2004-05-10 at 10:27, Helge Hafting wrote: > > Matt Mackall wrote: > > > > >One also wonders about whether all the RCU stuff is needed on UP. I'm > > >not sure if I grok all the finepoints here, but it looks like the > > >answer is no and that we can make struct_rcu head empty and have > > >call_rcu fall directly through to the callback. This would save > > >something like 16-32 bytes (32/64bit), not to mention a bunch of > > >dinking around with lists and whatnot. > > > > > >So what am I missing? > > > > > > > > Preempt can happen anytime, I believe. > > ok so for UP-non-preempt we can still get those 16 bytes back from the > dentry....
I suppose so. And on small SMP, really. We chose not to play those games early on so the code got the best testing coverage.
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