linux-kernel - Re: [PATCH] sched: remove resetting exec_start in put_prev_task

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]

Date:	Sat, 4 Jun 2011 12:26:18 +0800
From:	Hillf Danton <dhillf@...il.com>
To:	Yong Zhang <yong.zhang0@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Mike Galbraith <efault@....de>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: [PATCH] sched: remove resetting exec_start in put_prev_task_rt()

On Thu, Jun 2, 2011 at 4:04 PM, Yong Zhang <yong.zhang0@...il.com> wrote:
> On Wed, Jun 1, 2011 at 10:03 PM, Hillf Danton <dhillf@...il.com> wrote:
>> Resetting exec_start, after updated in update_curr_rt(), could open window for
>> messing up the subsequent computations of delta_exec of the given task.
>
> I can't see how could this happen. what kind of 'subsequent computations'
> do you mean?
>
> But because exec_start will be reset by _pick_next_task_rt()/set_curr_task_rt(),
> you patch is ok. IMHO it is not critical, it's just cleanup instead.
>

H i Yong

The window is closed in the two cases, as you tip fingered, would you please
say a few more words about the window and tick timer?

thanks
           Hillf
--
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/