From: Jens Axboe <axboe@kernel.dk>
To: David Laight <david.laight.linux@gmail.com>,
linux-kernel@vger.kernel.org
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
David Howells <dhowells@redhat.com>,
Matthew Wilcox <willy@infradead.org>,
Andrew Morton <akpm@linux-foundation.org>,
Alexander Viro <viro@zeniv.linux.org.uk>
Subject: Re: [PATCH next 0/3] iov: Optimise user copies
Date: Sat, 22 Mar 2025 08:36:25 -0600 [thread overview]
Message-ID: <1083f491-2da2-4ba3-b85b-53a057af0e65@kernel.dk> (raw)
In-Reply-To: <20250321224557.3847-1-david.laight.linux@gmail.com>
On 3/21/25 4:45 PM, David Laight wrote:
> The speculation barrier in access_ok() is expensive.
>
> The first patch removes the initial checks when reading the iovec[].
> The checks are repeated before the actual copy.
>
> The second patch uses 'user address masking' if supported.
>
> The third removes a lot of code for single entry iovec[].
Looks good to me:
Reviewed-by: Jens Axboe <axboe@kernel.dk>
--
Jens Axboe
prev parent reply other threads:[~2025-03-22 14:36 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-03-21 22:45 David Laight
2025-03-21 22:45 ` [PATCH next 1/3] iov: Remove access_ok() from import_iovec() David Laight
2025-03-21 22:45 ` [PATCH next 2/3] iov: Use masked user accesses David Laight
2025-03-21 22:45 ` [PATCH next 3/3] iov: Optimise __import_iovec_ubuf() David Laight
2025-03-21 23:35 ` [PATCH next 0/3] iov: Optimise user copies Linus Torvalds
2025-03-22 10:08 ` David Laight
2025-03-22 22:37 ` David Laight
2025-03-29 11:31 ` David Laight
2025-03-22 14:36 ` Jens Axboe [this message]
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