Re: [PATCH v3 6/7] mm: make clear_huge_page cache clear only around the

To:	"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Subject:	Re: [PATCH v3 6/7] mm: make clear_huge_page cache clear only around the fault address
From:	Andrea Arcangeli <aarcange@redhat.com>
Date:	Thu, 16 Aug 2012 20:29:44 +0200
Cc:	linux-mm@kvack.org, Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@redhat.com>, "H. Peter Anvin" <hpa@zytor.com>, x86@kernel.org, Andi Kleen <ak@linux.intel.com>, Tim Chen <tim.c.chen@linux.intel.com>, Alex Shi <alex.shu@intel.com>, Jan Beulich <jbeulich@novell.com>, Robert Richter <robert.richter@amd.com>, Andy Lutomirski <luto@amacapital.net>, Andrew Morton <akpm@linux-foundation.org>, Johannes Weiner <hannes@cmpxchg.org>, Hugh Dickins <hughd@google.com>, KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>, Mel Gorman <mgorman@suse.de>, linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-mips@linux-mips.org, linux-sh@vger.kernel.org, sparclinux@vger.kernel.org
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On Thu, Aug 16, 2012 at 07:43:56PM +0300, Kirill A. Shutemov wrote:
> Hm.. I think with static_key we can avoid cache overhead here. I'll try.

Could you elaborate on the static_key? Is it some sort of self
modifying code?

> Thanks, for review. Could you take a look at huge zero page patchset? ;)

I've noticed that too, nice :). I'm checking some detail on the
wrprotect fault behavior but I'll comment there.

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[PATCH v3 0/7] Avoid cache trashing on clearing huge/gigantic page, Kirill A. Shutemov [PATCH v3 1/7] THP: Use real address for NUMA policy, Kirill A. Shutemov [PATCH v3 7/7] x86: switch the 64bit uncached page clear to SSE/AVX v2, Kirill A. Shutemov [PATCH v3 2/7] THP: Pass fault address to __do_huge_pmd_anonymous_page(), Kirill A. Shutemov [PATCH v3 4/7] mm: pass fault address to clear_huge_page(), Kirill A. Shutemov [PATCH v3 3/7] hugetlb: pass fault address to hugetlb_no_page(), Kirill A. Shutemov [PATCH v3 5/7] x86: Add clear_page_nocache, Kirill A. Shutemov [PATCH v3 6/7] mm: make clear_huge_page cache clear only around the fault address, Kirill A. Shutemov Re: [PATCH v3 6/7] mm: make clear_huge_page cache clear only around the fault address, Andrea Arcangeli Re: [PATCH v3 6/7] mm: make clear_huge_page cache clear only around the fault address, Kirill A. Shutemov Re: [PATCH v3 6/7] mm: make clear_huge_page cache clear only around the fault address, Andrea Arcangeli <= Re: [PATCH v3 6/7] mm: make clear_huge_page cache clear only around the fault address, Kirill A. Shutemov Re: [PATCH v3 6/7] mm: make clear_huge_page cache clear only around the fault address, Andrea Arcangeli

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