From: Christoph Lameter <cl@linux.com>
To: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org,
Paul Turner <pjt@google.com>,
Lee Schermerhorn <Lee.Schermerhorn@hp.com>,
Rik van Riel <riel@redhat.com>, Mel Gorman <mgorman@suse.de>,
Andrew Morton <akpm@linux-foundation.org>,
Andrea Arcangeli <aarcange@redhat.com>,
Linus Torvalds <torvalds@linux-foundation.org>,
Ingo Molnar <mingo@kernel.org>,
Thomas Gleixner <tglx@linutronix.de>
Subject: Re: [PATCH 0/8] Announcement: Enhanced NUMA scheduling with adaptive affinity
Date: Mon, 12 Nov 2012 23:43:41 +0000 [thread overview]
Message-ID: <0000013af701ca15-3acab23b-a16d-4e38-9dc0-efef05cbc5f2-000000@email.amazonses.com> (raw)
In-Reply-To: <20121112160451.189715188@chello.nl>
On Mon, 12 Nov 2012, Peter Zijlstra wrote:
> The biggest conceptual addition, beyond the elimination of the home
> node, is that the scheduler is now able to recognize 'private' versus
> 'shared' pages, by carefully analyzing the pattern of how CPUs touch the
> working set pages. The scheduler automatically recognizes tasks that
> share memory with each other (and make dominant use of that memory) -
> versus tasks that allocate and use their working set privately.
That is a key distinction to make and if this really works then that is
major progress.
> This new scheduler code is then able to group tasks that are "memory
> related" via their memory access patterns together: in the NUMA context
> moving them on the same node if possible, and spreading them amongst
> nodes if they use private memory.
What happens if processes memory accesses are related but the
common set of data does not fit into the memory provided by a single node?
The correct resolution usually is in that case to interleasve the pages
over both nodes in use.
next prev parent reply other threads:[~2012-11-12 23:43 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-11-12 16:04 [PATCH 0/8] Announcement: Enhanced NUMA scheduling with adaptive affinity Peter Zijlstra
2012-11-12 16:04 ` [PATCH 1/8] sched, numa, mm: Introduce sched_feat_numa() Peter Zijlstra
2012-11-12 16:04 ` [PATCH 2/8] sched, numa, mm: Implement THP migration Peter Zijlstra
2012-11-12 16:04 ` [PATCH 3/8] sched, numa, mm: Add credits for NUMA placement Peter Zijlstra
2012-11-12 16:04 ` [PATCH 4/8] sched, numa, mm: Add last_cpu to page flags Peter Zijlstra
2012-11-13 11:55 ` Ingo Molnar
2012-11-13 16:09 ` Rik van Riel
2012-11-12 16:04 ` [PATCH 5/8] sched, numa, mm: Add adaptive NUMA affinity support Peter Zijlstra
2012-11-13 0:02 ` Christoph Lameter
2012-11-13 8:19 ` Ingo Molnar
2012-11-13 22:57 ` Rik van Riel
2012-11-16 18:06 ` Rik van Riel
2012-11-16 18:14 ` Ingo Molnar
2012-11-16 18:23 ` Rik van Riel
2012-11-29 19:34 ` Andi Kleen
2012-11-12 16:04 ` [PATCH 6/8] sched, numa, mm: Implement constant, per task Working Set Sampling (WSS) rate Peter Zijlstra
2012-11-12 16:04 ` [PATCH 7/8] sched, numa, mm: Count WS scanning against present PTEs, not virtual memory ranges Peter Zijlstra
2012-11-12 16:04 ` [PATCH 8/8] sched, numa, mm: Implement slow start for working set sampling Peter Zijlstra
2012-11-12 18:48 ` Benchmark results: "Enhanced NUMA scheduling with adaptive affinity" Ingo Molnar
2012-11-15 10:08 ` Mel Gorman
2012-11-15 18:52 ` Rik van Riel
2012-11-15 21:27 ` Mel Gorman
2012-11-15 20:32 ` Linus Torvalds
2012-11-15 22:04 ` Rik van Riel
2012-11-16 14:14 ` Mel Gorman
2012-11-16 19:50 ` Andrea Arcangeli
2012-11-16 20:05 ` Mel Gorman
2012-11-16 16:16 ` Ingo Molnar
2012-11-16 15:56 ` Ingo Molnar
2012-11-16 16:25 ` Mel Gorman
2012-11-16 17:49 ` Ingo Molnar
2012-11-16 19:04 ` Mel Gorman
2012-11-12 23:43 ` Christoph Lameter [this message]
2012-11-13 7:24 ` [PATCH 0/8] Announcement: Enhanced NUMA scheduling with adaptive affinity Ingo Molnar
2012-11-15 14:26 ` Christoph Lameter
2012-11-16 15:59 ` Ingo Molnar
2012-11-16 20:57 ` Christoph Lameter
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