From: David Hildenbrand <david@redhat.com>
To: Peter Xu <peterx@redhat.com>
Cc: Linux Memory Management List <linux-mm@kvack.org>,
Minchan Kim <minchan@kernel.org>,
Matthew Wilcox <willy@infradead.org>,
Rik van Riel <riel@surriel.com>, Michal Hocko <mhocko@kernel.org>,
Andrea Arcangeli <aarcange@redhat.com>
Subject: Re: Page zapping and page table reclaim
Date: Thu, 11 Mar 2021 22:35:19 +0100 [thread overview]
Message-ID: <634820ea-33bf-7423-cdea-ab3e63aa9729@redhat.com> (raw)
In-Reply-To: <20210311212628.GK194839@xz-x1>
On 11.03.21 22:26, Peter Xu wrote:
> On Thu, Mar 11, 2021 at 07:14:02PM +0100, David Hildenbrand wrote:
>> I was wondering, is there any mechanism that reclaims basically empty page
>> tables in a running process?
>
> Would munmap() count? :)
Haha, no -- also not mmap(FIXED) or mremap(FIXED) ;)
As so often lately, the use case is sparse memory mappings where we
a) may want to reuse the area later.
b) don't want to hold the mmap lock in write while optimizing
c) don't want to create a lot of individual mappings that we might not
be able to merge again.
--
Thanks,
David / dhildenb
next prev parent reply other threads:[~2021-03-11 21:35 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-11 18:14 David Hildenbrand
2021-03-11 21:26 ` Peter Xu
2021-03-11 21:35 ` David Hildenbrand [this message]
2021-03-19 17:04 ` Yang Shi
2021-03-22 9:34 ` David Hildenbrand
2021-03-18 16:57 ` Vlastimil Babka
2021-03-18 23:53 ` Balbir Singh
2021-03-19 12:44 ` David Hildenbrand
2021-03-20 1:56 ` Balbir Singh
2021-03-22 9:19 ` David Hildenbrand
2021-03-18 18:03 ` Rik van Riel
2021-03-18 18:15 ` David Hildenbrand
2021-03-24 9:55 ` David Hildenbrand
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