linux-kernel - Re: [PATCH 4/7] fuse: Move prefaulting out of hot write path

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Message-ID: <CAJfpegtc56iCZe7KfEm-juA7DriLn7Pe5yvZEWzZqx1R5MdicA@mail.gmail.com>
Date: Tue, 15 Apr 2025 10:43:59 +0200
From: Miklos Szeredi <miklos@...redi.hu>
To: Dave Hansen <dave.hansen@...ux.intel.com>
Cc: linux-kernel@...r.kernel.org, 
	Linus Torvalds <torvalds@...ux-foundation.org>, "Ted Ts'o" <tytso@....edu>, 
	Christian Brauner <brauner@...nel.org>, "Darrick J. Wong" <djwong@...nel.org>, 
	Matthew Wilcox <willy@...radead.org>, Al Viro <viro@...iv.linux.org.uk>, 
	linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH 4/7] fuse: Move prefaulting out of hot write path

On Wed, 29 Jan 2025 at 19:17, Dave Hansen <dave.hansen@...ux.intel.com> wrote:
>
>
> From: Dave Hansen <dave.hansen@...ux.intel.com>
>
> Prefaulting the write source buffer incurs an extra userspace access
> in the common fast path. Make fuse_fill_write_pages() consistent with
> generic_perform_write(): only touch userspace an extra time when
> copy_folio_from_iter_atomic() has failed to make progress.
>
> Signed-off-by: Dave Hansen <dave.hansen@...ux.intel.com>
> Cc: Miklos Szeredi <miklos@...redi.hu>

Applied, thanks.

Miklos