From: Andrew Cooper <andrew.cooper3@citrix.com>
To: Juergen Gross <jgross@suse.com>, <xen-devel@lists.xenproject.org>
Cc: Stefano Stabellini <sstabellini@kernel.org>,
Julien Grall <julien@xen.org>, Wei Liu <wl@xen.org>,
Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
George Dunlap <George.Dunlap@eu.citrix.com>,
Ian Jackson <ian.jackson@eu.citrix.com>,
Jan Beulich <jbeulich@suse.com>
Subject: Re: [Xen-devel] [PATCH v2 1/4] xen/rcu: use rcu softirq for forcing quiescent state
Date: Fri, 21 Feb 2020 14:17:20 +0000 [thread overview]
Message-ID: <2c1765ff-cbea-950d-93c6-f36e9a3f9a86@citrix.com> (raw)
In-Reply-To: <20200218122114.17596-2-jgross@suse.com>
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@suse.com>
Acked-by: Andrew Cooper <andrew.cooper3@citrix.com>
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next prev parent reply other threads:[~2020-02-21 14:17 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-18 12:21 [Xen-devel] [PATCH v2 0/4] xen/rcu: let rcu work better with core scheduling Juergen Gross
2020-02-18 12:21 ` [Xen-devel] [PATCH v2 1/4] xen/rcu: use rcu softirq for forcing quiescent state Juergen Gross
2020-02-21 14:17 ` Andrew Cooper [this message]
2020-02-18 12:21 ` [Xen-devel] [PATCH v2 2/4] xen/rcu: don't use stop_machine_run() for rcu_barrier() Juergen Gross
2020-02-18 12:21 ` [Xen-devel] [PATCH v2 3/4] xen: add process_pending_softirqs_norcu() for keyhandlers Juergen Gross
2020-02-24 11:25 ` Roger Pau Monné
2020-02-24 11:44 ` Jürgen Groß
2020-02-24 12:02 ` Roger Pau Monné
2020-02-18 12:21 ` [Xen-devel] [PATCH v2 4/4] xen/rcu: add assertions to debug build Juergen Gross
2020-02-24 11:31 ` Roger Pau Monné
2020-02-24 11:45 ` Jürgen Groß
2020-02-18 13:15 ` [Xen-devel] [PATCH v2 0/4] xen/rcu: let rcu work better with core scheduling Igor Druzhinin
2020-02-19 16:48 ` Igor Druzhinin
2020-02-22 2:29 ` Igor Druzhinin
2020-02-22 6:05 ` Jürgen Groß
2020-02-22 12:32 ` Julien Grall
2020-02-22 13:56 ` Jürgen Groß
2020-02-22 16:42 ` Igor Druzhinin
2020-02-23 14:14 ` Jürgen Groß
2020-02-27 15:16 ` Igor Druzhinin
2020-02-27 15:21 ` Jürgen Groß
2020-02-28 7:10 ` Jürgen Groß
2020-03-02 13:25 ` Igor Druzhinin
2020-03-02 14:03 ` Jürgen Groß
2020-03-02 14:23 ` Igor Druzhinin
2020-03-02 14:32 ` Jürgen Groß
2020-03-02 22:29 ` Igor Druzhinin
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