From: Jens Freimann <jfrei@linux.vnet.ibm.com>
To: Christian Borntraeger <borntraeger@de.ibm.com>,
Alexander Graf <agraf@suse.de>,
Cornelia Huck <cornelia.huck@de.ibm.com>
Cc: Jens Freimann <jfrei@linux.vnet.ibm.com>, qemu-devel@nongnu.org
Subject: [Qemu-devel] [PATCH 0/5] s390x/kvm: avoid synchronize_rcu's in kernel
Date: Thu, 28 Aug 2014 13:58:47 +0200 [thread overview]
Message-ID: <1409227132-55354-1-git-send-email-jfrei@linux.vnet.ibm.com> (raw)
Whenever we call an ioctl from a wrong vcpu thread, the next ioctl will be
painfully slow because a synchronize_rcu thread has to be performed, therefore
involving all vcpu.
This patch series forces most ioctls to run on the associated vcpu.
It speeds up all start/restart/reset operations involving cpus drastically.
David Hildenbrand (5):
kvm: run cpu state synchronization on target vcpu thread
s390x/kvm: run guest triggered resets on the target vcpu thread
s390x/kvm: execute sigp orders on the target vcpu thread
s390x/kvm: execute "system reset" cpu resets on the vcpu thread
s390x/kvm: execute the first cpu reset on the vcpu thread
kvm-all.c | 18 ++++++++++++++++--
target-s390x/cpu.c | 6 +++++-
target-s390x/cpu.h | 15 +++++++++++++++
target-s390x/kvm.c | 23 ++++++++++++++++-------
target-s390x/misc_helper.c | 30 ++++++++----------------------
5 files changed, 60 insertions(+), 32 deletions(-)
--
1.9.3
next reply other threads:[~2014-08-28 11:59 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-08-28 11:58 Jens Freimann [this message]
2014-08-28 11:58 ` [Qemu-devel] [PATCH 1/5] kvm: run cpu state synchronization on target vcpu thread Jens Freimann
2014-08-28 11:58 ` [Qemu-devel] [PATCH 2/5] s390x/kvm: run guest triggered resets on the " Jens Freimann
2014-08-28 11:58 ` [Qemu-devel] [PATCH 3/5] s390x/kvm: execute sigp orders " Jens Freimann
2014-08-28 11:58 ` [Qemu-devel] [PATCH 4/5] s390x/kvm: execute "system reset" cpu resets on the " Jens Freimann
2014-08-28 11:58 ` [Qemu-devel] [PATCH 5/5] s390x/kvm: execute the first cpu reset " Jens Freimann
2014-08-28 12:58 ` [Qemu-devel] [PATCH 0/5] s390x/kvm: avoid synchronize_rcu's in kernel Christian Borntraeger
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