linux-kernel - Re: [PATCH] pid: Do not set pid

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Message-ID: <20250306-immun-filmt-c2283120de42@brauner>
Date: Thu,  6 Mar 2025 10:35:25 +0100
From: Christian Brauner <brauner@...nel.org>
To: Alexander Mikhalitsyn <alexander@...alicyn.com>,
	linux-kernel@...r.kernel.org,
	Michal Koutný <mkoutny@...e.com>
Cc: Christian Brauner <brauner@...nel.org>,
	Joel Granados <joel.granados@...nel.org>,
	Oleg Nesterov <oleg@...hat.com>,
	"Eric W . Biederman" <ebiederm@...ssion.com>,
	"Martin K . Petersen" <martin.petersen@...cle.com>,
	Wei Liu <wei.liu@...nel.org>,
	Baoquan He <bhe@...hat.com>,
	Frederic Weisbecker <frederic@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] pid: Do not set pid_max in new pid namespaces

On Wed, 05 Mar 2025 15:58:49 +0100, Michal Koutný wrote:
> It is already difficult for users to troubleshoot which of multiple pid
> limits restricts their workload. The per-(hierarchical-)NS pid_max would
> contribute to the confusion.
> Also, the implementation copies the limit upon creation from
> parent, this pattern showed cumbersome with some attributes in legacy
> cgroup controllers -- it's subject to race condition between parent's
> limit modification and children creation and once copied it must be
> changed in the descendant.
> 
> [...]

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] pid: Do not set pid_max in new pid namespaces
      https://git.kernel.org/vfs/vfs/c/d385c8bceb14