linux-kernel - Re: [PATCH rdma-next] IB/mlx5: Reduce IMR KSM size when 5-level paging is enabled

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Message-Id: <176388919468.1783514.9358959459855331067.b4-ty@kernel.org>
Date: Sun, 23 Nov 2025 04:13:14 -0500
From: Leon Romanovsky <leon@...nel.org>
To: Jason Gunthorpe <jgg@...pe.ca>, Leon Romanovsky <leon@...nel.org>
Cc: linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Yishai Hadas <yishaih@...dia.com>, Or Har-Toov <ohartoov@...dia.com>, 
 Michael Guralnik <michaelgur@...dia.com>, 
 Edward Srouji <edwards@...dia.com>
Subject: Re: [PATCH rdma-next] IB/mlx5: Reduce IMR KSM size when 5-level
 paging is enabled


On Thu, 20 Nov 2025 16:49:28 +0200, Leon Romanovsky wrote:
> Enabling 5-level paging (LA57) increases TASK_SIZE on x86_64 from 2^47
> to 2^56. This affects implicit ODP, which uses TASK_SIZE to calculate
> the number of IMR KSM entries.
> 
> As a result, the number of entries and the memory usage for KSM mkeys
> increase drastically:
> 
> [...]

Applied, thanks!

[1/1] IB/mlx5: Reduce IMR KSM size when 5-level paging is enabled
      https://git.kernel.org/rdma/rdma/c/4bf35d1d17c8d5

Best regards,
-- 
Leon Romanovsky <leon@...nel.org>