linux-kernel - Re: [PATCH 08/35] autonuma: introduce kthread_bind

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: <1338313686.26856.164.camel@twins>
Date:	Tue, 29 May 2012 19:48:06 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Andrea Arcangeli <aarcange@...hat.com>
Cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Hillf Danton <dhillf@...il.com>, Dan Smith <danms@...ibm.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>, Paul Turner <pjt@...gle.com>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	Mike Galbraith <efault@....de>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Bharata B Rao <bharata.rao@...il.com>,
	Lee Schermerhorn <Lee.Schermerhorn@...com>,
	Rik van Riel <riel@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>,
	Christoph Lameter <cl@...ux.com>
Subject: Re: [PATCH 08/35] autonuma: introduce kthread_bind_node()

On Tue, 2012-05-29 at 19:44 +0200, Andrea Arcangeli wrote:
> 
> But it'd be totally bad not to do the hard bindings to the cpu_s_ of
> the node, and not using PF_THREAD_BOUND would just allow userland to
> shoot itself in the foot. I mean if PF_THREAD_BOUND wouldn't exist
> already I wouldn't add it, but considering somebody bothered to
> implement it for the sake to make userland root user "safer", it'd be
> really silly not to take advantage of that for knuma_migrated too
> (even if it binds to more than 1 CPU). 

No, I'm absolutely ok with the user shooting himself in the foot. The
thing exists because you can crash stuff if you get it wrong with
per-cpu.

Crashing is not good, worse performance is his own damn fault.
--
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/