[PATCH v4 0/6] xen: simplify suspend/resume handling

From: Juergen Gross <jgross@suse.com>
To: xen-devel@lists.xenproject.org
Cc: "Juergen Gross" <jgross@suse.com>, "Tim Deegan" <tim@xen.org>,
	"Stefano Stabellini" <sstabellini@kernel.org>,
	"Wei Liu" <wei.liu2@citrix.com>,
	"Konrad Rzeszutek Wilk" <konrad.wilk@oracle.com>,
	"George Dunlap" <george.dunlap@eu.citrix.com>,
	"Andrew Cooper" <andrew.cooper3@citrix.com>,
	"Ian Jackson" <ian.jackson@eu.citrix.com>,
	"Dario Faggioli" <dfaggioli@suse.com>,
	"Julien Grall" <julien.grall@arm.com>,
	"Jan Beulich" <jbeulich@suse.com>,
	"Roger Pau Monné" <roger.pau@citrix.com>
Subject: [PATCH v4 0/6] xen: simplify suspend/resume handling
Date: Tue,  2 Apr 2019 18:19:04 +0200	[thread overview]
Message-ID: <20190402161910.14860-1-jgross@suse.com> (raw)

Especially in the scheduler area (schedule.c, cpupool.c) there is a
rather complex handling involved when doing suspend and resume.

This can be simplified a lot by not performing a complete cpu down and
up cycle for the non-boot cpus, but keeping the pure software related
state and freeing it only in case a cpu didn't come up again during
resume.

In summary not only the complexity can be reduced, but the failure
tolerance will be even better with this series: With a dedicated hook
for failing cpus when resuming it is now possible to survive e.g. a
cpupool being left without any cpu after resume by moving its domains
to cpupool0.

Juergen Gross (6):
  xen/sched: call cpu_disable_scheduler() via cpu notifier
  xen: add helper for calling notifier_call_chain() to common/cpu.c
  xen: add new cpu notifier action CPU_RESUME_FAILED
  xen: don't free percpu areas during suspend
  xen/cpupool: simplify suspend/resume handling
  xen/sched: don't disable scheduler on cpus during suspend

 xen/arch/arm/smpboot.c     |   2 -
 xen/arch/x86/percpu.c      |   3 +-
 xen/arch/x86/smpboot.c     |   3 -
 xen/common/cpu.c           |  61 +++++++-------
 xen/common/cpupool.c       | 131 ++++++++++++------------------
 xen/common/schedule.c      | 197 +++++++++++++++++++--------------------------
 xen/include/xen/cpu.h      |  29 ++++---
 xen/include/xen/sched-if.h |   1 -
 8 files changed, 184 insertions(+), 243 deletions(-)

-- 
2.16.4

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