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Date: Fri, 13 Sep 2013 15:24:35 +0200 From: Peter Zijlstra <peterz@...radead.org> To: "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com> Cc: Alex Thorlton <athorlton@....com>, Ingo Molnar <mingo@...hat.com>, Andrew Morton <akpm@...ux-foundation.org>, Naoya Horiguchi <n-horiguchi@...jp.nec.com>, "Eric W . Biederman" <ebiederm@...ssion.com>, "Paul E . McKenney" <paulmck@...ux.vnet.ibm.com>, Al Viro <viro@...iv.linux.org.uk>, Andi Kleen <ak@...ux.intel.com>, Andrea Arcangeli <aarcange@...hat.com>, Dave Hansen <dave.hansen@...el.com>, Dave Jones <davej@...hat.com>, David Howells <dhowells@...hat.com>, Frederic Weisbecker <fweisbec@...il.com>, Johannes Weiner <hannes@...xchg.org>, Kees Cook <keescook@...omium.org>, Mel Gorman <mgorman@...e.de>, Michael Kerrisk <mtk.manpages@...il.com>, Oleg Nesterov <oleg@...hat.com>, Rik van Riel <riel@...hat.com>, Robin Holt <robinmholt@...il.com>, Sedat Dilek <sedat.dilek@...il.com>, Srikar Dronamraju <srikar@...ux.vnet.ibm.com>, Thomas Gleixner <tglx@...utronix.de>, linux-kernel@...r.kernel.org, linux-mm@...ck.org Subject: Re: [PATCH 8/9] mm: implement split page table lock for PMD level On Fri, Sep 13, 2013 at 04:06:15PM +0300, Kirill A. Shutemov wrote: > The basic idea is the same as with PTE level: the lock is embedded into > struct page of table's page. > > Split pmd page table lock only makes sense on big machines. > Let's say >= 32 CPUs for now. Why is this? Couldn't I generate the same amount of contention on PMD level as I can on PTE level in the THP case? -- 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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