netdev - Re: [PATCH stable 3.4 v2 1/2] ipv4: move route garbage collector to work queue

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Date:	Tue, 19 Aug 2014 17:31:50 -0300
From:	Marcelo Ricardo Leitner <mleitner@...hat.com>
To:	davem@...emloft.net
CC:	hannes@...hat.com, netdev@...r.kernel.org, eric.dumazet@...il.com
Subject: Re: [PATCH stable 3.4 v2 1/2] ipv4: move route garbage collector
 to work queue

Em 14-08-2014 16:44, Marcelo Ricardo Leitner escreveu:
> Currently the route garbage collector gets called by dst_alloc() if it
> have more entries than the threshold. But it's an expensive call, that
> don't really need to be done by then.
>
> Another issue with current way is that it allows running the garbage
> collector with the same start parameters on multiple CPUs at once, which
> is not optimal. A system may even soft lockup if the cache is big enough
> as the garbage collectors will be fighting over the hash lock entries.
>
> This patch thus moves the garbage collector to run asynchronously on a
> work queue, much similar to how rt_expire_check runs.
>
> There is one condition left that allows multiple executions, which is
> handled by the next patch.
>
> Signed-off-by: Marcelo Ricardo Leitner <mleitner@...hat.com>
> Acked-by: Hannes Frederic Sowa <hannes@...essinduktion.org>
> ---
>
> Notes:
>      Hi,
>
>      This set is needed for stables <= 3.4, as the IPv4 route cache was
>      removed after that.
>
>      v1->v2: addressed indentation issue noticed by David Miller
>
>      Thanks!
>

Hi Dave,

Sorry to bother you but WDYT, is this patchset more appropriate?

Thanks,
Marcelo

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