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  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:	Tue, 12 Aug 2014 20:50:37 +0200
From:	Hannes Frederic Sowa <hannes@...hat.com>
To:	Marcelo Ricardo Leitner <mleitner@...hat.com>
Cc:	davem@...emloft.net, netdev@...r.kernel.org, eric.dumazet@...il.com
Subject: Re: [PATCH stable 3.4 2/2] ipv4: avoid parallel route cache gc
 executions

On Mo, 2014-08-11 at 19:41 -0300, Marcelo Ricardo Leitner wrote:
> When rt_intern_hash() has to deal with neighbour cache overflowing,
> it triggers the route cache garbage collector in an attempt to free
> some references on neighbour entries.
> 
> Such call cannot be done async but should also not run in parallel with
> an already-running one, so that they don't collapse fighting over the
> hash lock entries.
> 
> This patch thus blocks parallel executions by ignoring the call if
> garbage collector is already running on another CPU.
> 
> We don't use a spinlock for it because now it runs on a work queue and
> we want it to be schedulable in-between the hash indexes.
> 
> Signed-off-by: Marcelo Ricardo Leitner <mleitner@...hat.com>
> Cc: Hannes Frederic Sowa <hannes@...hat.com>

Acked-by: Hannes Frederic Sowa <hannes@...essinduktion.org>


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

Powered by blists - more mailing lists