linux-kernel - Re: [RFC] mm: why vfree() do not free page table memory?

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Message-ID: <5A56BD66.8040607@huawei.com>
Date:   Thu, 11 Jan 2018 09:27:02 +0800
From:   Xishi Qiu <qiuxishi@...wei.com>
To:     Xishi Qiu <qiuxishi@...wei.com>
CC:     Michal Hocko <mhocko@...nel.org>, Vlastimil Babka <vbabka@...e.cz>,
        "Mel Gorman" <mgorman@...hsingularity.net>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux MM <linux-mm@...ck.org>,
        "Wujiangtao (A)" <wu.wujiangtao@...wei.com>,
        "Qiuchangqi (Lion, Euler Dept )" <qiuchangqi.qiu@...wei.com>
Subject: Re: [RFC] mm: why vfree() do not free page table memory?

On 2017/12/29 16:58, Xishi Qiu wrote:

> When calling vfree(), it calls unmap_vmap_area() to clear page table,
> but do not free the memory of page table, why? just for performance?
> 
> If a driver use vmalloc() and vfree() frequently, we will lost much
> page table memory, maybe oom later.
> 
> Thanks,
> Xishi Qiu
> 

ping

> 
> .
>