linux-kernel - Re: [PATCH 01/10] mm/numa: node demotion data structure and lookup

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Message-ID: <YG64w7NC59fn8Py+@localhost.localdomain>
Date:   Thu, 8 Apr 2021 10:03:15 +0200
From:   Oscar Salvador <osalvador@...e.de>
To:     Dave Hansen <dave.hansen@...ux.intel.com>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        shy828301@...il.com, weixugc@...gle.com, rientjes@...gle.com,
        ying.huang@...el.com, dan.j.williams@...el.com, david@...hat.com
Subject: Re: [PATCH 01/10] mm/numa: node demotion data structure and lookup

On Thu, Apr 01, 2021 at 11:32:18AM -0700, Dave Hansen wrote:
> 
> From: Dave Hansen <dave.hansen@...ux.intel.com>
> 
> Prepare for the kernel to auto-migrate pages to other memory nodes
> with a user defined node migration table. This allows creating single
> migration target for each NUMA node to enable the kernel to do NUMA
> page migrations instead of simply reclaiming colder pages. A node
> with no target is a "terminal node", so reclaim acts normally there.
> The migration target does not fundamentally _need_ to be a single node,
> but this implementation starts there to limit complexity.
> 
> If you consider the migration path as a graph, cycles (loops) in the
> graph are disallowed.  This avoids wasting resources by constantly
> migrating (A->B, B->A, A->B ...).  The expectation is that cycles will
> never be allowed.
> 
> Signed-off-by: Dave Hansen <dave.hansen@...ux.intel.com>
> Reviewed-by: Yang Shi <shy828301@...il.com>
> Cc: Wei Xu <weixugc@...gle.com>
> Cc: David Rientjes <rientjes@...gle.com>
> Cc: Huang Ying <ying.huang@...el.com>
> Cc: Dan Williams <dan.j.williams@...el.com>
> Cc: David Hildenbrand <david@...hat.com>
> Cc: osalvador <osalvador@...e.de>

I think this patch and patch#2 could be squashed

Reviewed-by: Oscar Salvador <osalvador@...e.de>

-- 
Oscar Salvador
SUSE L3