linux-kernel - Re: [PATCH v3 0/2] ublk: simplify user copy

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Message-Id: <176247181033.292880.16085659049514901290.b4-ty@kernel.dk>
Date: Thu, 06 Nov 2025 16:30:10 -0700
From: Jens Axboe <axboe@...nel.dk>
To: Ming Lei <ming.lei@...hat.com>, 
 Caleb Sander Mateos <csander@...estorage.com>
Cc: linux-block@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 0/2] ublk: simplify user copy


On Thu, 06 Nov 2025 10:16:45 -0700, Caleb Sander Mateos wrote:
> Use copy_page_{to,from}_user() and rq_for_each_segment() to simplify the
> implementation of ublk_copy_user_pages(). Avoiding the page pinning and
> unpinning saves expensive atomic increments and decrements of the page
> reference counts. And copying via user virtual addresses avoids needing
> to split the copy at user page boundaries. Ming reports a 40% throughput
> improvement when issuing I/O to the selftests null ublk server with
> zero-copy disabled.
> 
> [...]

Applied, thanks!

[1/2] ublk: use copy_{to,from}_iter() for user copy
      commit: 2299ceec364eecdc0a5b4ec80c757551d130389c
[2/2] ublk: use rq_for_each_segment() for user copy
      commit: e87d66ab27ac89494b75ddc3fed697b5aa8417f1

Best regards,
-- 
Jens Axboe