Messages in this thread | | | Subject | Re: [patch 0/7] [RFC] SLUB: Improve allocpercpu to reduce per cpu access overhead | From | Peter Zijlstra <> | Date | Fri, 02 Nov 2007 11:28:46 +0100 |
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On Thu, 2007-11-01 at 15:58 -0700, David Miller wrote:
> Since you're the one who wants to change the semantics and guarentees > of this interface, perhaps it might help if you did some greps around > the tree to see how alloc_percpu() is actually used. That's what > I did when I started running into trouble with your patches.
This fancy new BDI stuff also lives off percpu_counter/alloc_percpu().
That means that for example each NFS mount also consumes a number of words - not quite sure from the top of my head how many, might be in the order of 24 bytes or something.
I once before started looking at this, because the current alloc_percpu() can have some false sharing - not that I have machines that are overly bothered by that. I like the idea of a strict percpu region, however do be aware of the users.
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