From: Xishi Qiu <qiuxishi@huawei.com>
To: Xishi Qiu <qiuxishi@huawei.com>
Cc: Michal Hocko <mhocko@kernel.org>,
Vlastimil Babka <vbabka@suse.cz>,
Mel Gorman <mgorman@techsingularity.net>,
LKML <linux-kernel@vger.kernel.org>,
Linux MM <linux-mm@kvack.org>,
"Wujiangtao (A)" <wu.wujiangtao@huawei.com>,
"Qiuchangqi (Lion, Euler Dept )" <qiuchangqi.qiu@huawei.com>
Subject: Re: [RFC] mm: why vfree() do not free page table memory?
Date: Thu, 11 Jan 2018 09:27:02 +0800 [thread overview]
Message-ID: <5A56BD66.8040607@huawei.com> (raw)
In-Reply-To: <5A4603AB.8060809@huawei.com>
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
>
> .
>
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WARNING: multiple messages have this Message-ID (diff)
From: Xishi Qiu <qiuxishi@huawei.com>
To: Xishi Qiu <qiuxishi@huawei.com>
Cc: Michal Hocko <mhocko@kernel.org>,
Vlastimil Babka <vbabka@suse.cz>,
"Mel Gorman" <mgorman@techsingularity.net>,
LKML <linux-kernel@vger.kernel.org>,
Linux MM <linux-mm@kvack.org>,
"Wujiangtao (A)" <wu.wujiangtao@huawei.com>,
"Qiuchangqi (Lion, Euler Dept )" <qiuchangqi.qiu@huawei.com>
Subject: Re: [RFC] mm: why vfree() do not free page table memory?
Date: Thu, 11 Jan 2018 09:27:02 +0800 [thread overview]
Message-ID: <5A56BD66.8040607@huawei.com> (raw)
In-Reply-To: <5A4603AB.8060809@huawei.com>
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
>
> .
>
next prev parent reply other threads:[~2018-01-11 1:27 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-12-29 8:58 [RFC] mm: why vfree() do not free page table memory? Xishi Qiu
2018-01-11 1:27 ` Xishi Qiu [this message]
2018-01-11 1:27 ` Xishi Qiu
2018-01-17 9:16 ` Vlastimil Babka
2018-01-17 9:16 ` Vlastimil Babka
2018-01-17 9:48 ` Xishi Qiu
2018-01-17 9:48 ` Xishi Qiu
2018-01-17 13:14 ` Vlastimil Babka
2018-01-17 13:14 ` Vlastimil Babka
2018-01-17 14:17 ` Matthew Wilcox
2018-01-17 14:17 ` Matthew Wilcox
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