netdev - Re: [RFC 2/2] page_frag_cache: Store metadata in struct page

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Message-Id: <20180317.165458.1452469008226572576.davem@davemloft.net>
Date:   Sat, 17 Mar 2018 16:54:58 -0400 (EDT)
From:   David Miller <davem@...emloft.net>
To:     alexander.duyck@...il.com
Cc:     willy@...radead.org, alexander.h.duyck@...el.com,
        linux-mm@...r.kernel.org, netdev@...r.kernel.org,
        mawilcox@...rosoft.com
Subject: Re: [RFC 2/2] page_frag_cache: Store metadata in struct page

From: Alexander Duyck <alexander.duyck@...il.com>
Date: Thu, 15 Mar 2018 14:26:28 -0700

> So my concern with this patch is that it is essentially trading off
> CPU performance for reduced size. One of the reasons for getting away
> from using the page pointer is because it is expensive to access the
> page when the ref_count is bouncing on multiple cache lines.

Agreed.