linux-kernel - Re: [PATCH] mm: Make allocator take care of memoryless numa node

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Message-ID: <20201019070644.GB27114@dhcp22.suse.cz>
Date:   Mon, 19 Oct 2020 09:06:44 +0200
From:   Michal Hocko <mhocko@...e.com>
To:     Tianxianting <tian.xianting@....com>
Cc:     "cl@...ux.com" <cl@...ux.com>,
        "penberg@...nel.org" <penberg@...nel.org>,
        "rientjes@...gle.com" <rientjes@...gle.com>,
        "iamjoonsoo.kim@....com" <iamjoonsoo.kim@....com>,
        "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "alexei.starovoitov@...il.com" <alexei.starovoitov@...il.com>
Subject: Re: [PATCH] mm: Make allocator take care of memoryless numa node

On Sun 18-10-20 14:18:37, Tianxianting wrote:
> Thanks for the comments
> I found in current code, there are two places to call
> local_memory_node(node) before calling kzalloc_node(), I think we can
> remove them?

I am not sure which code you are talking about. git grep shows me 2
places in blk-mq code (e.g. bffed457160ab) and that looks quite bogus to
me. Bring that up with the respective maintainer and Raghavendra.
The changelog doesn't really describe any problem, if there is any. But
from the allocator semantic point of view memory less nodes are to be
expected and the allocator should fallback to the proper node. As long
as __GFP_THISNODE is not enforced of course.
-- 
Michal Hocko
SUSE Labs