linux-kernel - Re: [PATCH 1/2] MIPS: set page access bit with pgprot on some MIPS platform

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Date:   Fri, 5 Jun 2020 17:39:09 +0800
From:   Jiaxun Yang <jiaxun.yang@...goat.com>
To:     Bibo Mao <maobibo@...ngson.cn>
Cc:     Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Paul Burton <paulburton@...nel.org>,
        linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arch@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH 1/2] MIPS: set page access bit with pgprot on some MIPS
 platform

On Fri,  5 Jun 2020 17:11:05 +0800
Bibo Mao <maobibo@...ngson.cn> wrote:

> On MIPS system which has rixi hardware bit, page access bit is not
> set in pgrot. For memory reading, there will be one page fault to
> allocate physical page; however valid bit is not set, there will
> be the second fast tlb-miss fault handling to set valid/access bit.
> 
> This patch set page access/valid bit with pgrot if there is reading
> access privilege. It will reduce one tlb-miss handling for memory
> reading access.
> 
> The valid/access bit will be cleared in order to track memory
> accessing activity. If the page is accessed, tlb-miss fast handling
> will set valid/access bit, pte_sw_mkyoung is not necessary in slow
> page fault path. This patch removes pte_sw_mkyoung function which
> is defined as empty function except MIPS system.
> 
> Signed-off-by: Bibo Mao <maobibo@...ngson.cn>
> ---

Thanks for tracking it down.

Could you please make the patch tittle more clear?
"Some" looks confuse to me, "systems with RIXI" would be better.

- Jiaxun