linux-kernel - Re: [RFC] a question about mlockall() and mprotect()

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Date:   Tue, 26 Sep 2017 11:45:16 +0200
From:   Vlastimil Babka <vbabka@...e.cz>
To:     Xishi Qiu <qiuxishi@...wei.com>, Michal Hocko <mhocko@...nel.org>
Cc:     Joonsoo Kim <iamjoonsoo.kim@....com>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Linux MM <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>,
        zhong jiang <zhongjiang@...wei.com>,
        yeyunfeng <yeyunfeng@...wei.com>, wanghaitao12@...wei.com,
        "Zhoukang (A)" <zhoukang7@...wei.com>
Subject: Re: [RFC] a question about mlockall() and mprotect()

On 09/26/2017 11:22 AM, Xishi Qiu wrote:
> On 2017/9/26 17:13, Xishi Qiu wrote:
>>> This is still very fuzzy. What are you actually trying to achieve?
>>
>> I don't expect page fault any more after mlock.
>>
> 
> Our apps is some thing like RT, and page-fault maybe cause a lot of time,
> e.g. lock, mem reclaim ..., so I use mlock and don't want page fault
> any more.

Why does your app then have restricted mprotect when calling mlockall()
and only later adjusts the mprotect?

Vlastimil