From: Christopher Lameter <cl@linux.com>
To: Xianting Tian <tian.xianting@h3c.com>
Cc: penberg@kernel.org, rientjes@google.com, iamjoonsoo.kim@lge.com,
akpm@linux-foundation.org, linux-mm@kvack.org,
linux-kernel@vger.kernel.org, kuba@kernel.org,
alexei.starovoitov@gmail.com
Subject: Re: [PATCH] mm: Make allocator take care of memoryless numa node
Date: Mon, 12 Oct 2020 15:22:42 +0000 (UTC) [thread overview]
Message-ID: <alpine.DEB.2.22.394.2010121520440.154031@www.lameter.com> (raw)
In-Reply-To: <20201012082739.15661-1-tian.xianting@h3c.com>
On Mon, 12 Oct 2020, Xianting Tian wrote:
> In architecture like powerpc, we can have cpus without any local memory
> attached to it. In such cases the node does not have real memory.
>
> In many places of current kernel code, it doesn't judge whether the node is
> memoryless numa node before calling allocator interface.
That is intentional. SLUB relies on the page allocator to pick a node.
> This patch is to use local_memory_node(), which is guaranteed to have
> memory, in allocator interface. local_memory_node() is a noop in other
> architectures that don't support memoryless nodes.
The patch would destroy the support for memory policies in the
SLUB allocator and likely in the other ones as well.
prev parent reply other threads:[~2020-10-12 15:22 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-12 8:27 [PATCH] mm: Make allocator take care of memoryless numa node Xianting Tian
2020-10-12 15:05 ` Michal Hocko
2020-10-18 14:18 ` Tianxianting
2020-10-19 7:06 ` Michal Hocko
2020-10-19 7:14 ` Tianxianting
2020-10-12 15:22 ` Christopher Lameter [this message]
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