linux-kernel - Re: [PATCH v6 3/4] mm/memory.c: Add memory read privilege on page fault handling

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Message-Id: <20200525144413.8c13559ec87616aa2c77af41@linux-foundation.org>
Date:   Mon, 25 May 2020 14:44:13 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Bibo Mao <maobibo@...ngson.cn>
Cc:     Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Jiaxun Yang <jiaxun.yang@...goat.com>,
        Huacai Chen <chenhc@...ote.com>,
        Paul Burton <paulburton@...nel.org>,
        Dmitry Korotin <dkorotin@...ecomp.com>,
        Philippe Mathieu-Daudé <f4bug@...at.org>,
        Stafford Horne <shorne@...il.com>,
        Steven Price <steven.price@....com>,
        Anshuman Khandual <anshuman.khandual@....com>,
        linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org,
        Mike Rapoport <rppt@...ux.ibm.com>,
        Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
        "Maciej W. Rozycki" <macro@....com>, linux-mm@...ck.org,
        David Hildenbrand <david@...hat.com>
Subject: Re: [PATCH v6 3/4] mm/memory.c: Add memory read privilege on page
 fault handling

On Mon, 25 May 2020 10:52:39 +0800 Bibo Mao <maobibo@...ngson.cn> wrote:

> Here add pte_sw_mkyoung function to make page readable on MIPS
> platform during page fault handling. This patch improves page
> fault latency about 10% on my MIPS machine with lmbench
> lat_pagefault case.
> 
> It is noop function on other arches, there is no negative
> influence on those architectures.

Acked-by: Andrew Morton <akpm@...ux-foundation.org>

Should I take these, or would the mips tree be preferred?  I'm OK
either way, but probably the MIPS tree would be better?