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Date: Tue, 29 May 2012 10:38:34 -0700 From: Linus Torvalds <torvalds@...ux-foundation.org> To: Andrea Arcangeli <aarcange@...hat.com> Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>, linux-kernel@...r.kernel.org, linux-mm@...ck.org, Hillf Danton <dhillf@...il.com>, Dan Smith <danms@...ibm.com>, Andrew Morton <akpm@...ux-foundation.org>, Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...e.hu>, Paul Turner <pjt@...gle.com>, Suresh Siddha <suresh.b.siddha@...el.com>, Mike Galbraith <efault@....de>, "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>, Lai Jiangshan <laijs@...fujitsu.com>, Bharata B Rao <bharata.rao@...il.com>, Lee Schermerhorn <Lee.Schermerhorn@...com>, Rik van Riel <riel@...hat.com>, Johannes Weiner <hannes@...xchg.org>, Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>, Christoph Lameter <cl@...ux.com> Subject: Re: [PATCH 13/35] autonuma: add page structure fields On Tue, May 29, 2012 at 9:38 AM, Andrea Arcangeli <aarcange@...hat.com> wrote: > On Tue, May 29, 2012 at 03:16:25PM +0200, Peter Zijlstra wrote: >> 24 bytes per page.. or ~0.6% of memory gone. This is far too great a >> price to pay. > > I don't think it's too great, memcg uses for half of that and yet > nobody is booting with cgroup_disable=memory even on not-NUMA servers > with less RAM. A big fraction of one percent is absolutely unacceptable. Our "struct page" is one of our biggest memory users, there's no way we should cavalierly make it even bigger. It's also a huge performance sink, the cache miss on struct page tends to be one of the biggest problems in managing memory. We may not ever fix that, but making struct page bigger certainly isn't going to help the bad cache behavior. Linus -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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