linux-kernel - Re: [PATCH] cgroup: limit block I/O bandwidth

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: <4797A9C3.1000707@users.sourceforge.net>
Date:	Wed, 23 Jan 2008 21:55:32 +0100 (MET)
From:	Andrea Righi <righiandr@...rs.sourceforge.net>
To:	Andrea Righi <righiandr@...rs.sourceforge.net>,
	Naveen Gupta <ngupta@...gle.com>,
	Jens Axboe <jens.axboe@...cle.com>,
	Paul Menage <menage@...gle.com>,
	Dhaval Giani <dhaval@...ux.vnet.ibm.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Pavel Emelyanov <xemul@...nvz.org>
Subject: Re: [PATCH] cgroup: limit block I/O bandwidth

Balbir Singh wrote:
> * Andrea Righi <righiandr@...rs.sourceforge.net> [2008-01-23 16:23:59]:
> 
>> Probably tracking who dirtied the pages would be the best approach, but
>> we want also to reduce the overhead of this tracking. So, we should find
>> a smart way to track which cgroup dirtied the pages and then only when
>> the i/o scheduler dispatches the write requests of those pages, account
>> the i/o operations to the opportune cgroup. In this way throttling could
>> be done probably in __set_page_dirty() as well.
>>
> 
> I think the OpenVZ controller works that way.

Well... looking at the code it seems that OpenVZ doesn't use this
strategy, instead performs UBC-based I/O accounting looking at the
__set_page_dirty*() for writes and submit_bio() for reads. Then,
independently from accounting data, it uses per-UBC i/o priority model
that is mapped directly on the CFQ i/o priority model.

-Andrea
--
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/