From: Rik van Riel <riel@redhat.com>
To: Ingo Molnar <mingo@kernel.org>
Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org,
Paul Turner <pjt@google.com>,
Lee Schermerhorn <Lee.Schermerhorn@hp.com>,
Christoph Lameter <cl@linux.com>, Mel Gorman <mgorman@suse.de>,
Andrew Morton <akpm@linux-foundation.org>,
Andrea Arcangeli <aarcange@redhat.com>,
Linus Torvalds <torvalds@linux-foundation.org>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
Thomas Gleixner <tglx@linutronix.de>,
Hugh Dickins <hughd@google.com>
Subject: Re: [PATCH 1/2] sched, numa, mm: Count WS scanning against present PTEs, not virtual memory ranges
Date: Wed, 14 Nov 2012 13:37:43 -0500 [thread overview]
Message-ID: <50A3E4F7.5010807@redhat.com> (raw)
In-Reply-To: <1352883029-7885-2-git-send-email-mingo@kernel.org>
On 11/14/2012 03:50 AM, Ingo Molnar wrote:
> From: Peter Zijlstra <a.p.zijlstra@chello.nl>
>
> By accounting against the present PTEs, scanning speed reflects the
> actual present (mapped) memory.
>
> For this we modify mm/mprotect.c::change_protection() to return the
> number of ptes modified. (No change in functionality.)
We need to figure out what we actually want here.
Do we want to mark 256MB as non-present, or do we want to leave
behind 256MB of non-present (NUMA) memory? :)
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next prev parent reply other threads:[~2012-11-14 18:37 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-11-14 8:50 [PATCH 0/2] change_protection(): Count the number of pages affected Ingo Molnar
2012-11-14 8:50 ` [PATCH 1/2] sched, numa, mm: Count WS scanning against present PTEs, not virtual memory ranges Ingo Molnar
2012-11-14 18:37 ` Rik van Riel [this message]
2012-11-14 8:50 ` [PATCH 2/2] mm: Optimize the TLB flush of sys_mprotect() and change_protection() users Ingo Molnar
2012-11-14 18:39 ` Rik van Riel
2012-11-14 18:01 ` [PATCH 0/2] change_protection(): Count the number of pages affected Linus Torvalds
2012-11-14 18:43 ` Rik van Riel
2012-11-14 20:52 ` Linus Torvalds
2012-11-14 22:04 ` Rik van Riel
2012-11-16 18:40 ` Ingo Molnar
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