From mboxrd@z Thu Jan  1 00:00:00 1970
From: Andrea Arcangeli <andrea@qumranet.com>
Subject: [ofa-general] Re: [PATCH 08 of 11] anon-vma-rwsem
Date: Thu, 8 May 2008 01:02:42 +0200
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Cc: Nick Piggin <npiggin@suse.de>, Chris Wright <chrisw@redhat.com>,
	Rusty Russell <rusty@rustcorp.com.au>,
	Peter Zijlstra <a.p.zijlstra@chello.nl>,
	Marcelo Tosatti <marcelo@kvack.org>, kvm-devel@lists.sourceforge.net,
	Kanoj Sarcar <kanojsarcar@yahoo.com>, Roland Dreier <rdreier@cisco.com>,
	Jack Steiner <steiner@sgi.com>, linux-kernel@vger.kernel.org,
	Avi Kivity <avi@qumranet.com>, Anthony Liguori <aliguori@us.ibm.com>,
	"Paul E. McKenney" <paulmck@us.ibm.com>, linux-mm@kvack.org,
	Robin Holt <holt@sgi.com>, general@lists.openfabrics.org,
	Hugh Dickins <hugh@veritas.com>, Andrew Morton <akpm@linux-foundation.org>,
	Eric Dumazet <dada1@cosmosbay.com>, Christoph Lameter <clameter@sgi.com>
To: Linus Torvalds <torvalds@linux-foundation.org>
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To remove mm_lock without adding an horrible system-wide lock before
every i_mmap_lock etc.. we've to remove
invalidate_range_begin/end. Then we can return to an older approach of
doing only invalidate_page and serializing it with the PT lock against
get_user_pages. That works fine for KVM but GRU will have to flush the
tlb once every time we drop the PT lock, that means once per each 512
ptes on x86-64 etc... instead of a single time for the whole range
regardless how large the range is.