From: David Hildenbrand <david@redhat.com>
To: Juan Yescas <jyescas@google.com>,
lsf-pc@lists.linux-foundation.org,
Suren Baghdasaryan <surenb@google.com>,
linux-mm@kvack.org, Kalesh Singh <kaleshsingh@google.com>,
Isaac Manjarres <isaacmanjarres@google.com>,
"T.J. Mercier" <tjmercier@google.com>, Zi Yan <ziy@nvidia.com>,
Barry Song <21cnbao@gmail.com>
Subject: Re: [LSF/MM/BPF TOPIC] CMA reservation optimizations
Date: Tue, 28 Jan 2025 10:58:41 +0100 [thread overview]
Message-ID: <50b7265e-64b9-41a3-af48-79ded6674f21@redhat.com> (raw)
In-Reply-To: <CAJDx_riGaT-2_6QWve9Dir56EYMZudtJ-0WAk5x+OwgTGshNNw@mail.gmail.com>
On 28.01.25 02:04, Juan Yescas wrote:
> Hi LSF organizers,
>
> I would like to continue discussing this topic with the mm community:
>
> "CMA reservation optimizations"
>
> Note: There is already an email in the linux-mm mailing list that is
> discussing this issue. The title is:
>
> "CMA reservations require 32MiB alignment in 16KiB page size kernels
> instead of 8MiB in 4KiB page size kernel"
>
> Background
>
> When the drivers reserve CMA memory in 16KiB kernels, the minimum
> alignment is 32 MiB as per CMA_MIN_ALIGNMENT_BYTES. However, in 4KiB
> kernels, the CMA alignment is 4MiB.
I'm curious, here you say 4 MiB, above 8 MiB.
But nowadays it's usually 2 MiB (pageblock size), no?
--
Cheers,
David / dhildenb
next prev parent reply other threads:[~2025-01-28 9:58 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-01-28 1:04 Juan Yescas
2025-01-28 9:58 ` David Hildenbrand [this message]
2025-01-28 17:07 ` Juan Yescas
2025-01-28 18:33 ` David Hildenbrand
2025-01-28 20:15 ` Zi Yan
2025-04-02 18:01 ` Juan Yescas
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