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:   Fri, 3 May 2019 08:06:05 -0400
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Steffen Klassert <steffen.klassert@...unet.com>,
        Florian Westphal <fw@...len.de>
Cc:     vakul.garg@....com, netdev@...r.kernel.org,
        Eric Dumazet <edumazet@...gle.com>
Subject: Re: [RFC HACK] xfrm: make state refcounting percpu



On 5/3/19 2:07 AM, Steffen Klassert wrote:
> On Wed, Apr 24, 2019 at 12:40:23PM +0200, Florian Westphal wrote:
>> I'm not sure this is a good idea to begin with, refcount
>> is right next to state spinlock which is taken for both tx and rx ops,
>> plus this complicates debugging quite a bit.
> 
> 


For some reason I have not received Florian response.

Florian, when the percpu counters are in nominal mode,
the updates are only in percpu memory, so the cache line containing struct percpu_ref in the
main object is not dirtied.

(This field/object can be placed in a read-mostly location of the structure if needed)

I would definitely try to use this.

Powered by blists - more mailing lists