linux-kernel - Re: [PATCH] sched: Update task->on_rq when tasks are moving between runqueues

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: <20151029005710.GA11285@codeaurora.org>
Date:	Wed, 28 Oct 2015 17:57:10 -0700
From:	Olav Haugan <ohaugan@...eaurora.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	mingo@...hat.com, linux-kernel@...r.kernel.org,
	linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH] sched: Update task->on_rq when tasks are moving between
 runqueues

On 15-10-25 11:09:24, Peter Zijlstra wrote:
> On Sat, Oct 24, 2015 at 11:01:02AM -0700, Olav Haugan wrote:
> > Task->on_rq has three states:
> > 	0 - Task is not on runqueue (rq)
> > 	1 (TASK_ON_RQ_QUEUED) - Task is on rq
> > 	2 (TASK_ON_RQ_MIGRATING) - Task is on rq but in the process of being
> > 	migrated to another rq
> > 
> > When a task is moving between rqs task->on_rq state should be
> > TASK_ON_RQ_MIGRATING
> 
> Only when not holding both rq locks..

IMHO I think we should keep the state of p->on_rq updated with the correct state
all the time unless I am incorrect in what p->on_rq represent. The task
is moving between rq's and is on the rq so the state should be
TASK_ON_RQ_MIGRATING right? I do realize that the code is currently not
broken. However, in the future someone might come along and change
set_task_cpu() and the code change might rely on an accurate p->on_rq value. It
would be good design to keep this value correct.

Thanks,

-- 
.Olav

The Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project
--
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/