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

From: Frederic Weisbecker
Date: Wed Mar 20 2013 - 12:37:14 EST

2013/3/20 David Miller <davem@xxxxxxxxxxxxx>:
> From: Chris Metcalf <cmetcalf@xxxxxxxxxx>
> 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@xxxxxxxxxx>
>> ---
>> 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@xxxxxxxxxxxxx>

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

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