linux-kernel - Re: [RFC][PATCH 8/8] RSS controller support reclamation

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:	Thu, 09 Nov 2006 20:45:43 +0100
From:	Arjan van de Ven <arjan@...radead.org>
To:	Balbir Singh <balbir@...ibm.com>
Cc:	Linux MM <linux-mm@...ck.org>, dev@...nvz.org,
	ckrm-tech@...ts.sourceforge.net,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	haveblue@...ibm.com, rohitseth@...gle.com
Subject: Re: [RFC][PATCH 8/8] RSS controller support reclamation

On Fri, 2006-11-10 at 01:06 +0530, Balbir Singh wrote:
> 
> Reclaim memory as we hit the max_shares limit. The code for reclamation
> is inspired from Dave Hansen's challenged memory controller and from the
> shrink_all_memory() code

Hmm.. I seem to remember that all previous RSS rlimit attempts actually
fell flat on their face because of the reclaim-on-rss-overflow behavior;
in the shared page / cached page (equally important!) case, it means
process A (or container A) suddenly penalizes process B (or container B)
by making B have pagecache misses because A was using a low RSS limit.

Unmapping the page makes sense, sure, and even moving then to inactive
lists or whatever that is called in the vm today, but reclaim... that's
expensive...

-
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/