netdev - Re: [PATCH] dynticks: avoid flow_cache_flush() interrupting every core

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Message-ID: <CAFTL4hwUuRdxUNF0rA9DVNREyBign6FRnAXFp_W+-YfYUfzU9Q@mail.gmail.com>
Date:	Wed, 20 Mar 2013 17:37:04 +0100
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	cmetcalf@...era.com, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, gilad@...yossef.com,
	sasha.levin@...cle.com, akpm@...ux-foundation.org,
	paulmck@...ux.vnet.ibm.com, yoshfuji@...ux-ipv6.org
Subject: Re: [PATCH] dynticks: avoid flow_cache_flush() interrupting every core

2013/3/20 David Miller <davem@...emloft.net>:
> From: Chris Metcalf <cmetcalf@...era.com>
> Date: Tue, 19 Mar 2013 17:35:58 -0400
>
>> Previously, if you did an "ifconfig down" or similar on one core, and
>> the kernel had CONFIG_XFRM enabled, every core would be interrupted to
>> check its percpu flow list for items that could be garbage collected.
>>
>> With this change, we generate a mask of cores that actually have any
>> percpu items, and only interrupt those cores.  When we are trying to
>> isolate a set of cpus from interrupts, this is important to do.
>>
>> Signed-off-by: Chris Metcalf <cmetcalf@...era.com>
>> ---
>> This change stands alone so could be taken into the net tree if
>> desired, but it is most useful in the context of Frederic Weisbecker's
>> linux-dynticks work.  So it could be taken up through either tree,
>> but it certainly needs sign-off from someone familiar with net/core/flow.c.
>
> I'm find with this going into the dynticks changes:
>
> Acked-by: David S. Miller <davem@...emloft.net>

At it looks pretty self-contained, can that perhaps go through the
networking tree?

Thanks.
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