linux-kernel - Re: [RFC 4/8] Improve the tracking of active utilisation

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: <5698A967.5050300@unitn.it>
Date:	Fri, 15 Jan 2016 09:10:15 +0100
From:	Luca Abeni <luca.abeni@...tn.it>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...hat.com>,
	Juri Lelli <juri.lelli@....com>
Subject: Re: [RFC 4/8] Improve the tracking of active utilisation

On 01/14/2016 08:47 PM, Peter Zijlstra wrote:
> On Thu, Jan 14, 2016 at 04:24:49PM +0100, Luca Abeni wrote:
>
>> +	if (!hrtimer_is_queued(timer)) {
>> +		hrtimer_start(timer, act, HRTIMER_MODE_ABS);
>> +	}
>> +
>> +	if (hrtimer_active(timer) == 0) {
>> +		printk("Problem activating inactive_timer!\n");
>> +		clear_running_bw(dl_se, dl_rq);
>> +		if (!dl_task(p)) {
>> +			__dl_clear_params(p);
>> +		}
>> +	} else {
>> +		get_task_struct(p);
>
> Ah, I missed that one. I would suggest putting that right _before_
> hrtimer_start(), because hrtimer_start() guarantees the callback will
> run.
Ok. So, if I understand well, the "if (hrtimer_active(timer) == 0)" check
is useless (or should be somehow revised)... Right?



			Thanks,
				Luca