linux-kernel - Re: [net-next v4 PATCH] page_pool: handle page recycle for NUMA_NO

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Message-ID: <20191219120925.GD26945@dhcp22.suse.cz>
Date:   Thu, 19 Dec 2019 13:09:25 +0100
From:   Michal Hocko <mhocko@...nel.org>
To:     Jesper Dangaard Brouer <brouer@...hat.com>
Cc:     netdev@...r.kernel.org, lirongqing@...du.com,
        linyunsheng@...wei.com,
        Ilias Apalodimas <ilias.apalodimas@...aro.org>,
        Saeed Mahameed <saeedm@...lanox.com>, peterz@...radead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [net-next v4 PATCH] page_pool: handle page recycle for
 NUMA_NO_NODE condition

On Wed 18-12-19 09:01:35, Jesper Dangaard Brouer wrote:
[...]
> For the NUMA_NO_NODE case, when a NIC IRQ is moved to another NUMA
> node, then ptr_ring will be emptied in 65 (PP_ALLOC_CACHE_REFILL+1)
> chunks per allocation and allocation fall-through to the real
> page-allocator with the new nid derived from numa_mem_id(). We accept
> that transitioning the alloc cache doesn't happen immediately.

Could you explain what is the expected semantic of NUMA_NO_NODE in this
case? Does it imply always the preferred locality? See my other email[1] to
this matter.

[1] http://lkml.kernel.org/r/20191219115338.GC26945@dhcp22.suse.cz
-- 
Michal Hocko
SUSE Labs