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Re: [Xen-devel] [PATCH v2 1/4] xen/rcu: use rcu softirq for forcing quiescent state
- To: Juergen Gross <jgross@xxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Fri, 21 Feb 2020 14:17:20 +0000
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- Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Wei Liu <wl@xxxxxxx>, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>, George Dunlap <George.Dunlap@xxxxxxxxxxxxx>, Ian Jackson <ian.jackson@xxxxxxxxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>
- Delivery-date: Fri, 21 Feb 2020 14:17:33 +0000
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- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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On 18/02/2020 12:21, Juergen Gross wrote:
> As rcu callbacks are processed in __do_softirq() there is no need to
> use the scheduling softirq for forcing quiescent state. Any other
> softirq would do the job and the scheduling one is the most expensive.
>
> So use the already existing rcu softirq for that purpose. For telling
> apart why the rcu softirq was raised add a flag for the current usage.
>
> Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
Acked-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
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