linux-kernel - Re: [Devel] Re: [PATCH v5 00/10] per-cgroup tcp memory pressure

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: <20111117.163501.1963137869848419475.davem@davemloft.net>
Date:	Thu, 17 Nov 2011 16:35:01 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	jbottomley@...allels.com
Cc:	eric.dumazet@...il.com, glommer@...allels.com,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	paul@...lmenage.org, lizf@...fujitsu.com, linux-mm@...ck.org,
	devel@...nvz.org, kirill@...temov.name, gthelen@...gle.com,
	kamezawa.hiroyu@...fujitsu.com
Subject: Re: [Devel] Re: [PATCH v5 00/10] per-cgroup tcp memory pressure

From: James Bottomley <jbottomley@...allels.com>
Date: Tue, 15 Nov 2011 18:27:12 +0000

> Ping on this, please.  We're blocked on this patch set until we can get
> an ack that the approach is acceptable to network people.

__sk_mem_schedule is now more expensive, because instead of short-circuiting
the majority of the function's logic when "allocated <= prot->sysctl_mem[0]"
and immediately returning 1, the whole rest of the function is run.

The static branch protecting all of the cgroup code seems to be
enabled if any memory based cgroup'ing is enabled.  What if people use
the memory cgroup facility but not for sockets?  I am to understand
that, of the very few people who are going to use this stuff in any
capacity, this would be a common usage.

TCP specific stuff in mm/memcontrol.c, at best that's not nice at all.

Otherwise looks mostly good.
--
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/