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Re: [Xen-devel] [PATCH v2 0/4] xen/rcu: let rcu work better with core scheduling

To: Juergen Gross <jgross@xxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxxx>

From: Igor Druzhinin <igor.druzhinin@xxxxxxxxxx>

Date: Wed, 19 Feb 2020 16:48:05 +0000

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Cc: Kevin Tian <kevin.tian@xxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Jun Nakajima <jun.nakajima@xxxxxxxxx>, Wei Liu <wl@xxxxxxx>, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>, George Dunlap <George.Dunlap@xxxxxxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Ian Jackson <ian.jackson@xxxxxxxxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>

Delivery-date: Wed, 19 Feb 2020 16:48:16 +0000

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List-id: Xen developer discussion <xen-devel.lists.xenproject.org>

On 18/02/2020 13:15, Igor Druzhinin wrote: > On 18/02/2020 12:21, Juergen Gross wrote: >> Today the RCU handling in Xen is affecting scheduling in several ways. >> It is raising sched softirqs without any real need and it requires >> tasklets for rcu_barrier(), which interacts badly with core scheduling. >> >> This small series repairs those issues. >> >> Additionally some ASSERT()s are added for verification of sane rcu >> handling. In order to avoid those triggering right away the obvious >> violations are fixed. >> > > Initial test of the first 2 patches is promising. Will run more tests > over night to see how stable it is. I stress-tested it over night and it seems to work for our case. Tested-by: Igor Druzhinin <igor.druzhinin@xxxxxxxxxx> Igor _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxxx https://lists.xenproject.org/mailman/listinfo/xen-devel

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