netdev - Re: [PATCH net-next V3 1/3] page_pool: Add API to update numa node

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Date:   Wed, 20 Nov 2019 13:15:37 +0100
From:   Jesper Dangaard Brouer <brouer@...hat.com>
To:     Saeed Mahameed <saeedm@...lanox.com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Jonathan Lemon <jonathan.lemon@...il.com>,
        Ilias Apalodimas <ilias.apalodimas@...aro.org>,
        brouer@...hat.com
Subject: Re: [PATCH net-next V3 1/3] page_pool: Add API to update numa node

On Wed, 20 Nov 2019 00:15:17 +0000
Saeed Mahameed <saeedm@...lanox.com> wrote:

> Add page_pool_update_nid() to be called by page pool consumers when they
> detect numa node changes.
> 
> It will update the page pool nid value to start allocating from the new
> effective numa node.
> 
> This is to mitigate page pool allocating pages from a wrong numa node,
> where the pool was originally allocated, and holding on to pages that
> belong to a different numa node, which causes performance degradation.
> 
> For pages that are already being consumed and could be returned to the
> pool by the consumer, in next patch we will add a check per page to avoid
> recycling them back to the pool and return them to the page allocator.
> 
> Signed-off-by: Saeed Mahameed <saeedm@...lanox.com>
> Acked-by: Jonathan Lemon <jonathan.lemon@...il.com>
> Reviewed-by: Ilias Apalodimas <ilias.apalodimas@...aro.org>

Acked-by: Jesper Dangaard Brouer <brouer@...hat.com>

-- 
Best regards,
  Jesper Dangaard Brouer
  MSc.CS, Principal Kernel Engineer at Red Hat
  LinkedIn: http://www.linkedin.com/in/brouer