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From: Juan Yescas <jyescas@google.com>
To: david@redhat.com
Cc: akash.tyagi@mediatek.com, akpm@linux-foundation.org,
	 angelogioacchino.delregno@collabora.com, hannes@cmpxchg.org,
	 jackmanb@google.com, linux-arm-kernel@lists.infradead.org,
	 linux-kernel@vger.kernel.org,
	linux-mediatek@lists.infradead.org,  linux-mm@kvack.org,
	matthias.bgg@gmail.com, mhocko@suse.com,  surenb@google.com,
	jyescas@google.com, kaleshsingh@google.com,
	 tjmercier@google.com, isaacmanjarres@google.com, vbabka@suse.cz,
	 wsd_upstream@mediatek.com, ziy@nvidia.com
Subject: [RFC PATCH] mm/page_alloc: Add PCP list for THP CMA
Date: Mon,  4 Aug 2025 11:31:21 -0700	[thread overview]
Message-ID: <20250804183121.2892827-1-jyescas@google.com> (raw)
In-Reply-To: <67a54f31-e568-427a-8fc8-9791fd34e11b@redhat.com>

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




  parent reply	other threads:[~2025-08-04 18:31 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2025-07-24  7:53 akash.tyagi
2025-07-24  9:52 ` David Hildenbrand
2025-07-25  5:08   ` akash.tyagi
2025-07-25  7:04     ` David Hildenbrand
2025-07-25 14:27       ` Zi Yan
2025-07-29 12:30         ` akash.tyagi
2025-07-29 12:42           ` David Hildenbrand
2025-07-29 12:50           ` Matthew Wilcox
2025-08-04 18:31   ` Juan Yescas [this message]
2025-08-04 18:20 Juan Yescas
2025-08-04 18:49 ` David Hildenbrand
2025-08-04 19:00   ` Zi Yan
2025-08-04 19:10     ` David Hildenbrand
2025-08-05  1:24     ` Juan Yescas
2025-08-05  1:22   ` Juan Yescas
2025-08-05  9:54     ` Vlastimil Babka
2025-08-05 16:46       ` Juan Yescas
2025-08-05 17:12       ` Juan Yescas
2025-08-05 21:09         ` Vlastimil Babka
2025-08-06 21:54           ` Juan Yescas
2025-08-05  9:58     ` David Hildenbrand
2025-08-05 16:57       ` Juan Yescas
2025-08-05 21:08         ` David Hildenbrand
2025-09-09 20:11           ` Juan Yescas

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