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 for Android: free password hash cracker in your pocket
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <AANLkTik7hxds1--gSWEtHGAfU607S=mZpvBrBdpFmCD=@mail.gmail.com>
Date:	Tue, 16 Nov 2010 10:49:22 -0800
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Lennart Poettering <mzxreary@...inter.de>
Cc:	Dhaval Giani <dhaval.giani@...il.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Mike Galbraith <efault@....de>,
	Vivek Goyal <vgoyal@...hat.com>,
	Oleg Nesterov <oleg@...hat.com>,
	Markus Trippelsdorf <markus@...ppelsdorf.de>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Ingo Molnar <mingo@...e.hu>,
	LKML <linux-kernel@...r.kernel.org>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>
Subject: Re: [RFC/RFT PATCH v3] sched: automated per tty task groups

On Tue, Nov 16, 2010 at 10:16 AM, Lennart Poettering
<mzxreary@...inter.de> wrote:
>
> Here's my super-complex patch btw, to achieve exactly the same thing
> from userspace without involving any kernel or systemd patching and
> kernel-side logic. Simply edit your own ~/.bashrc and add this to the end:

Right. And that's basically how this "patch" was actually tested
originally - by doing this by hand, without actually having a patch in
hand. I told people: this seems to work really well. Mike made it work
automatically.

Because it's something we want to do it for all users, and for all
shells, and make sure it gets done automatically. Including for users
that have old distributions etc, and make it easy to do in one place.
And then you do it for all the other heuristics we can see easily in
the kernel. And then you do it magically without users even having to
_notice_.

Suddenly it doesn't seem that wonderful any more to play with bashrc, does it?

That's the point. We can push out the kernel change, and everything
will "just work". We can make that feature we already have in the
kernel actually be _useful_.

User-level configuration for something that should just work is
annoying. We can do better.

Put another way: if we find a better way to do something, we should
_not_ say "well, if users want it, they can do this <technical thing
here>". If it really is a better way to do something, we should just
do it. Requiring user setup is _not_ a feature.

Now, I'm not saying that we shouldn't allow users to use cgroups. Of
course they can do things manually too. But we shouldn't require users
to do silly things that we can more easily do ourselves.

If the choice is between telling everybody "you should do this", and
"we should just do this for you", I'll take the second one every time.
We know it should be done. Why should we then tell somebody else to do
it for us?

                         Linus
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ