linux-kernel - Re: [RFC PATCH] mm/page_alloc: Add PCP list for THP CMA

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 for Android: free password hash cracker in your pocket

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <CAJDx_rgzkZognxWzOXJ-ZxdTtUaM3FT6bmpkwxMz03XiX3fKAQ@mail.gmail.com>
Date: Mon, 4 Aug 2025 11:20:00 -0700
From: Juan Yescas <jyescas@...gle.com>
To: David Hildenbrand <david@...hat.com>
Cc: akash.tyagi@...iatek.com, Andrew Morton <akpm@...ux-foundation.org>, 
	angelogioacchino.delregno@...labora.com, hannes@...xchg.org, 
	Brendan Jackman <jackmanb@...gle.com>, linux-arm-kernel@...ts.infradead.org, 
	linux-kernel@...r.kernel.org, linux-mediatek@...ts.infradead.org, 
	Linux Memory Management List <linux-mm@...ck.org>, matthias.bgg@...il.com, Michal Hocko <mhocko@...e.com>, 
	Suren Baghdasaryan <surenb@...gle.com>, Vlastimil Babka <vbabka@...e.cz>, wsd_upstream@...iatek.com, 
	Zi Yan <ziy@...dia.com>, Kalesh Singh <kaleshsingh@...gle.com>, 
	"T.J. Mercier" <tjmercier@...gle.com>, Isaac Manjarres <isaacmanjarres@...gle.com>, 
	Juan Yescas <jyescas@...gle.com>
Subject: Re: [RFC PATCH] mm/page_alloc: Add PCP list for THP CMA

Hi David/Zi,

Is there any reason why the MIGRATE_CMA pages are not in the PCP lists?

There are many devices that need fast allocation of MIGRATE_CMA pages,
and they have to get them from the buddy allocator, which is a bit
slower in comparison to the PCP lists.

We also have cases where the MIGRATE_CMA memory requirements are big.
For example, GPUs need MIGRATE_CMA memory in the ranges of 30MiB to 500MiBs.
These cases would benefit if we have THPs for CMAs.

Could we add the support for MIGRATE_CMA pages on the PCP and THP lists?

Thanks