linux-kernel - Re: [RFC][PATCH 1/7] Resource counters

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: <20070313160707.GF19939@in.ibm.com>
Date:	Tue, 13 Mar 2007 21:37:07 +0530
From:	Srivatsa Vaddagiri <vatsa@...ibm.com>
To:	Pavel Emelianov <xemul@...ru>
Cc:	Herbert Poetzl <herbert@...hfloor.at>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	containers@...ts.osdl.org, Paul Menage <menage@...gle.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [RFC][PATCH 1/7] Resource counters

On Tue, Mar 13, 2007 at 06:41:05PM +0300, Pavel Emelianov wrote:
> > right, but atomic ops have much less impact on most
> > architectures than locks :)
> 
> Right. But atomic_add_unless() is slower as it is
> essentially a loop. See my previous letter in this sub-thread.

If I am not mistaken, you shouldn't loop in normal cases, which means
it boils down to a atomic_read() + atomic_cmpxch()


-- 
Regards,
vatsa
-
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/