From: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
To: Huang Ying <ying.huang@intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>,
Mel Gorman <mgorman@suse.de>,
linux-kernel@vger.kernel.org, Ingo Molnar <mingo@redhat.com>,
Rik van Riel <riel@surriel.com>
Subject: Re: [RFC PATCH 1/2] NUMA balancing: fix NUMA topology type for memory tiering system
Date: Fri, 28 Jan 2022 10:53:45 +0530 [thread overview]
Message-ID: <20220128052345.GA618915@linux.vnet.ibm.com> (raw)
In-Reply-To: <20220128023842.1946583-1-ying.huang@intel.com>
* Huang Ying <ying.huang@intel.com> [2022-01-28 10:38:41]:
>
> One possible fix is to ignore CPU-less nodes when detecting NUMA
> topology type in init_numa_topology_type(). That works well for the
> example system. Is it good in general for any system with CPU-less
> nodes?
>
A CPUless node at the time online doesn't necessarily mean a CPUless node
for the entire boot. For example: On PowerVM Lpars, aka powerpc systems,
some of the nodes may start as CPUless nodes and then CPUS may get
populated/hotplugged on them.
Hence I am not sure if adding a check for CPUless nodes at node online may
work for such systems.
> Signed-off-by: "Huang, Ying" <ying.huang@intel.com>
> Suggested-by: Peter Zijlstra <peterz@infradead.org>
> Cc: Ingo Molnar <mingo@redhat.com>
> Cc: Mel Gorman <mgorman@suse.de>
> Cc: Rik van Riel <riel@surriel.com>
> Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
> ---
> kernel/sched/topology.c | 6 ++++++
> 1 file changed, 6 insertions(+)
>
--
Thanks and Regards
Srikar Dronamraju
next prev parent reply other threads:[~2022-01-28 5:24 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-01-28 2:38 [RFC PATCH 1/2] NUMA balancing: fix NUMA topology type for memory tiering system Huang Ying
2022-01-28 2:38 ` [RFC PATCH 2/2] NUMA balancing: avoid to migrate task to CPU-less node Huang Ying
2022-01-28 5:33 ` Srikar Dronamraju
2022-01-28 7:51 ` Huang, Ying
2022-02-01 5:59 ` Srikar Dronamraju
2022-02-08 8:19 ` Huang, Ying
2022-01-28 5:23 ` Srikar Dronamraju [this message]
2022-01-28 7:30 ` [RFC PATCH 1/2] NUMA balancing: fix NUMA topology type for memory tiering system Huang, Ying
2022-01-28 15:13 ` Peter Zijlstra
2022-01-30 1:07 ` Huang, Ying
2022-01-28 15:06 ` Peter Zijlstra
2022-01-28 17:08 ` Valentin Schneider
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