lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date:   Wed, 19 Apr 2023 05:11:45 +0100
From:   Matthew Wilcox <willy@...radead.org>
To:     Johannes Weiner <hannes@...xchg.org>
Cc:     linux-mm@...ck.org, Kaiyang Zhao <kaiyang2@...cmu.edu>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Vlastimil Babka <vbabka@...e.cz>,
        David Rientjes <rientjes@...gle.com>,
        linux-kernel@...r.kernel.org, kernel-team@...com
Subject: Re: [RFC PATCH 00/26] mm: reliable huge page allocator

On Tue, Apr 18, 2023 at 03:12:47PM -0400, Johannes Weiner wrote:
> This series proposes to make THP allocations reliable by enforcing
> pageblock hygiene, and aligning the allocator, reclaim and compaction
> on the pageblock as the base unit for managing free memory. All orders
> up to and including the pageblock are made first-class requests that
> (outside of OOM situations) are expected to succeed without
> exceptional investment by the allocating thread.
> 
> A neutral pageblock type is introduced, MIGRATE_FREE. The first
> allocation to be placed into such a block claims it exclusively for
> the allocation's migratetype. Fallbacks from a different type are no
> longer allowed, and the block is "kept open" for more allocations of
> the same type to ensure tight grouping. A pageblock becomes neutral
> again only once all its pages have been freed.

YES!  This is exactly what I've been thinking is the right solution
for some time.  Thank you for doing it.

Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ