linux-ext4 - Re: [RFC, PATCH] Avoid hot statistics cache line in ext4 extent cache

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: <4F70F51F.8030405@linux.intel.com>
Date:	Mon, 26 Mar 2012 16:00:47 -0700
From:	Andi Kleen <ak@...ux.intel.com>
To:	Vivek Haldar <haldar@...gle.com>
CC:	Andreas Dilger <adilger@...ger.ca>, tytso@....edu,
	linux-ext4@...r.kernel.org, tim.c.chen@...ux.intel.com
Subject: Re: [RFC, PATCH] Avoid hot statistics cache line in ext4 extent cache

On 3/26/2012 3:26 PM, Vivek Haldar wrote:
> Andi --
>
> I realized the problem soon after the original patch, and submitted
> another patch to make these per cpu  counters.

Is there a clear use case having these counters on every production system?

Especially given that they are racy and prone to lost updates today.

And you can still get the information if you really need it by putting a 
systemtap etc. probe.

-Andi

--
To unsubscribe from this list: send the line "unsubscribe linux-ext4" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html