netdev - 答复: [PATCH][v2] page_pool: handle page recycle for NUMA_NO

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Date:   Fri, 13 Dec 2019 06:27:28 +0000
From:   "Li,Rongqing" <lirongqing@...du.com>
To:     Yunsheng Lin <linyunsheng@...wei.com>,
        Jesper Dangaard Brouer <brouer@...hat.com>
CC:     Saeed Mahameed <saeedm@...lanox.com>,
        "ilias.apalodimas@...aro.org" <ilias.apalodimas@...aro.org>,
        "jonathan.lemon@...il.com" <jonathan.lemon@...il.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "mhocko@...nel.org" <mhocko@...nel.org>,
        "peterz@...radead.org" <peterz@...radead.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "bhelgaas@...gle.com" <bhelgaas@...gle.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Björn Töpel <bjorn.topel@...el.com>
Subject: 答复: [PATCH][v2] page_pool: handle page recycle for NUMA_NO_NODE condition

> 
> It is good to allocate the rx page close to both cpu and device, but if
> both goal can not be reached, maybe we choose to allocate page that close
> to cpu?
> 
I think it is true

If it is true, , we can remove pool->p.nid, and replace alloc_pages_node with
alloc_pages in __page_pool_alloc_pages_slow, and change pool_page_reusable as
that page_to_nid(page) is checked with numa_mem_id()  

since alloc_pages hint to use the current node page, and __page_pool_alloc_pages_slow 
will be called in NAPI polling often if recycle failed, after some cycle, the page will be from
local memory node.

-Li