linux-efi.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Gavin Shan <gshan@redhat.com>
To: Rob Herring <robh@kernel.org>
Cc: devicetree@vger.kernel.org,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	linux-efi <linux-efi@vger.kernel.org>,
	linux-arm-kernel <linux-arm-kernel@lists.infradead.org>,
	"open list:KERNEL VIRTUAL MACHINE FOR ARM64 (KVM/arm64)" 
	<kvmarm@lists.cs.columbia.edu>, Marc Zyngier <maz@kernel.org>,
	Randy Dunlap <rdunlap@infradead.org>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will@kernel.org>,
	shan.gavin@gmail.com
Subject: Re: [PATCH v2 2/2] of, numa: Fetch empty NUMA node ID from distance map
Date: Tue, 28 Sep 2021 09:59:25 +1000	[thread overview]
Message-ID: <c101363f-1de7-1d56-a8d9-243f003b48c1@redhat.com> (raw)
In-Reply-To: <CAL_JsqL8+_Q690-c3J4TS6LBF-mCUBxbhTfr994=Fwffqab0_w@mail.gmail.com>

Hi Rob,

On 9/28/21 12:49 AM, Rob Herring wrote:
> On Mon, Sep 27, 2021 at 1:42 AM Gavin Shan <gshan@redhat.com> wrote:
>>
>> There is no device node for the empty NUMA node. However, the
>> corresponding NUMA node ID and distance map is still valid in
>> "numa-distance-map-v1" compatible device node.
>>
>> This fetches the NUMA node ID and distance map for these empty
>> NUMA node from "numa-distance-map-v1" compatible device node.
> 
> This is much nicer.
> 

Indeed, thanks for your suggestions :)

>> Signed-off-by: Gavin Shan <gshan@redhat.com>
>> ---
>>   drivers/of/of_numa.c | 2 ++
>>   1 file changed, 2 insertions(+)
>>
>> diff --git a/drivers/of/of_numa.c b/drivers/of/of_numa.c
>> index fe6b13608e51..5949829a1b00 100644
>> --- a/drivers/of/of_numa.c
>> +++ b/drivers/of/of_numa.c
>> @@ -111,6 +111,8 @@ static int __init of_numa_parse_distance_map_v1(struct device_node *map)
>>                          return -EINVAL;
>>                  }
>>
>> +               node_set(nodea, numa_nodes_parsed);
>> +
> 
> With this, couldn't we remove of_numa_parse_cpu_nodes() as the only
> thing it does is node_set()?
> 

I don't think so for couple of reasons:

(1) With problematic device-tree, the distance map node might be missed
     or incomplete. In this case, of_numa_parse_cpu_nodes() still helps.

(2) @numa_nodes_parsed is also updated when the memory nodes are iterated
     in of_numa_parse_memory_nodes() and numa_add_memblk().

So @numa_nodes_parsed, which is synchronized to @node_possible_map afterwards,
is the gathering output of CPU nodes, memory nodes and distance map node.

>>                  numa_set_distance(nodea, nodeb, distance);
>>
>>                  /* Set default distance of node B->A same as A->B */

Thanks,
Gavin


  reply	other threads:[~2021-09-27 23:59 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-27  6:41 [PATCH v2 0/2] Specify empty NUMA node Gavin Shan
2021-09-27  6:41 ` [PATCH v2 1/2] Documentation, dt, numa: Add note to " Gavin Shan
2021-10-04 18:13   ` Rob Herring
2021-09-27  6:41 ` [PATCH v2 2/2] of, numa: Fetch empty NUMA node ID from distance map Gavin Shan
2021-09-27 14:49   ` Rob Herring
2021-09-27 23:59     ` Gavin Shan [this message]
2021-09-28 17:22       ` Rob Herring
2021-09-29  2:00         ` Gavin Shan
2021-10-04 18:13   ` Rob Herring

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=c101363f-1de7-1d56-a8d9-243f003b48c1@redhat.com \
    --to=gshan@redhat.com \
    --cc=catalin.marinas@arm.com \
    --cc=devicetree@vger.kernel.org \
    --cc=kvmarm@lists.cs.columbia.edu \
    --cc=linux-arm-kernel@lists.infradead.org \
    --cc=linux-efi@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=maz@kernel.org \
    --cc=rdunlap@infradead.org \
    --cc=robh@kernel.org \
    --cc=shan.gavin@gmail.com \
    --cc=will@kernel.org \
    --subject='Re: [PATCH v2 2/2] of, numa: Fetch empty NUMA node ID from distance map' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).