linux-kernel - Re: [PATCH] sched/rt: Rework for_each_process_thread() iterations in tg_has_rt

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

Message-ID: <20180425175535.GC4043@hirez.programming.kicks-ass.net>
Date:   Wed, 25 Apr 2018 19:55:35 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Kirill Tkhai <ktkhai@...tuozzo.com>
Cc:     mingo@...hat.com, linux-kernel@...r.kernel.org,
        Juri Lelli <juri.lelli@...il.com>
Subject: Re: [PATCH] sched/rt: Rework for_each_process_thread() iterations in
 tg_has_rt_tasks()

On Thu, Apr 19, 2018 at 08:29:01PM +0300, Kirill Tkhai wrote:
> tg_rt_schedulable() iterates over all child task groups,
> while tg_has_rt_tasks() iterates over all linked tasks.
> In case of systems with big number of tasks, this may
> take a lot of time.

So you're actually using RT cgroups?

Some of us recently considered removing that thing entirely because most
distro's don't actually use it at all -- and it's broken from a RT POV.

That would then clear the slate to try and implement something new.

But if you're actually using this stuff, that would complicate matters.