From: Jens Axboe <axboe@kernel.dk>
To: dejamarina@proton.me
Cc: io-uring@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] io_uring: keep memlock accounting while regions are mapped
Date: Tue, 25 Aug 2026 11:52:54 -0600 [thread overview]
Message-ID: <29d8d38f-cf2c-4216-96fd-546254c48332@kernel.dk> (raw)
In-Reply-To: <20260816-io-uring-retained-mmap-accounting-v1-1-44e5eedd7ad3@proton.me>
On 8/16/26 1:07 AM, Marina via B4 Relay wrote:
> From: Marina <dejamarina@proton.me>
>
> io_uring unaccounts kernel-allocated SQ/CQ and SQE regions when resize
> replaces them, even if existing VMAs still retain their pages. Repeating
> mmap and resize can therefore retain memory beyond RLIMIT_MEMLOCK.
>
> Move each charge to a refcounted record owned by the active region and its
> MMU or NOMMU mappings. Release it after both the region and final VMA are
> gone. Keep direct accounting for user-provided regions, which cannot be
> mapped through the io_uring file.
>
> Accounting stays region-granular, so a partial mapping retains the complete
> region charge.
Patch doesn't apply to the current tree at all. Please send an updated
one, if needed.
--
Jens Axboe
prev parent reply other threads:[~2026-08-25 17:52 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-08-16 7:07 [PATCH] io_uring: keep memlock accounting while regions are mapped Marina via B4 Relay
2026-08-25 17:52 ` Jens Axboe [this message]
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