linux-kernel - Re: [PATCH vfs/vfs.fixes v2] eventpoll: Set epoll timeout if it's in the future

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <20250417-kurzlebig-bedrohen-046f8724a6d6@brauner>
Date: Thu, 17 Apr 2025 09:56:32 +0200
From: Christian Brauner <brauner@...nel.org>
To: linux-fsdevel@...r.kernel.org,
	Joe Damato <jdamato@...tly.com>
Cc: Christian Brauner <brauner@...nel.org>,
	jack@...e.cz,
	Alexander Viro <viro@...iv.linux.org.uk>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Sridhar Samudrala <sridhar.samudrala@...el.com>,
	Alexander Duyck <alexander.h.duyck@...el.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH vfs/vfs.fixes v2] eventpoll: Set epoll timeout if it's in the future

On Wed, 16 Apr 2025 18:58:25 +0000, Joe Damato wrote:
> Avoid an edge case where epoll_wait arms a timer and calls schedule()
> even if the timer will expire immediately.
> 
> For example: if the user has specified an epoll busy poll usecs which is
> equal or larger than the epoll_wait/epoll_pwait2 timeout, it is
> unnecessary to call schedule_hrtimeout_range; the busy poll usecs have
> consumed the entire timeout duration so it is unnecessary to induce
> scheduling latency by calling schedule() (via schedule_hrtimeout_range).
> 
> [...]

Applied to the vfs.fixes branch of the vfs/vfs.git tree.
Patches in the vfs.fixes branch should appear in linux-next soon.

Please report any outstanding bugs that were missed during review in a
new review to the original patch series allowing us to drop it.

It's encouraged to provide Acked-bys and Reviewed-bys even though the
patch has now been applied. If possible patch trailers will be updated.

Note that commit hashes shown below are subject to change due to rebase,
trailer updates or similar. If in doubt, please check the listed branch.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs.git
branch: vfs.fixes

[1/1] eventpoll: Set epoll timeout if it's in the future
      https://git.kernel.org/vfs/vfs/c/0a65bc27bd64