linux-kernel - Re: [PATCH 2/2] block: Convert BDI proportion calculations to flexible proportions

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: <1337351677.573.44.camel@twins>
Date:	Fri, 18 May 2012 16:34:37 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Jan Kara <jack@...e.cz>
Cc:	Wu Fengguang <fengguang.wu@...el.com>,
	LKML <linux-kernel@...r.kernel.org>, linux-mm@...ck.org
Subject: Re: [PATCH 2/2] block: Convert BDI proportion calculations to
 flexible proportions

On Fri, 2012-05-18 at 16:24 +0200, Jan Kara wrote:
>   Yeah, that should be easy enough so I'll try it that way since I presume
> it's nicer to power usage to use deferred timers if it's reasonably
> possible. 

Btw, your current scheme also drifts. Since you do jiffes + 3*HZ you
period might actually be longer if the timer got delayed.

If you keep an external jiffies count like:

unsigned long period_jiffies = jiffies;

void my_timer_func()
{
	unsigned long delta = jiffies - period_jiffies;
	unsigned long periods = delta / 3*HZ;

	age(periods);

	period_jiffies += 3*HZ * periods;
	mod_timer(&my_timer, period_jiffies);
}


it all works without drift (+- bugs of course).
--
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/