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From: Xishi Qiu <qiuxishi@huawei.com>
To: Michal Hocko <mhocko@kernel.org>,
	Vlastimil Babka <vbabka@suse.cz>,
	Mel Gorman <mgorman@techsingularity.net>
Cc: LKML <linux-kernel@vger.kernel.org>,
	Linux MM <linux-mm@kvack.org>, Xishi Qiu <qiuxishi@huawei.com>,
	"Wujiangtao (A)" <wu.wujiangtao@huawei.com>
Subject: [RFC] mm: why vfree() do not free page table memory?
Date: Fri, 29 Dec 2017 16:58:19 +0800	[thread overview]
Message-ID: <5A4603AB.8060809@huawei.com> (raw)

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

             reply	other threads:[~2017-12-29  8:58 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-12-29  8:58 Xishi Qiu [this message]
2018-01-11  1:27 ` [RFC] mm: why vfree() do not free page table memory? Xishi Qiu
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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