On Fri, 16 Feb 2018 17:08:38 +0100 Viktor Mihajlovski <mihaj...@linux.vnet.ibm.com> wrote:
> From: Luiz Capitulino <lcapitul...@redhat.com> > > The query-cpus command has an extremely serious side effect: > it always interrupts all running vCPUs so that they can run > ioctl calls. This can cause a huge performance degradation for > some workloads. And most of the information retrieved by the > ioctl calls are not even used by query-cpus. > > This commit introduces a replacement for query-cpus called > query-cpus-fast, which has the following features: > > o Never interrupt vCPUs threads. query-cpus-fast only returns > vCPU information maintained by QEMU itself, which should be > sufficient for most management software needs > > o Drop "halted" field as it can not be retrieved in a fast > way on most architectures > > o Drop irrelevant fields such as "current", "pc" and "arch" > > o Rename some fields for better clarification & proper naming > standard > > Signed-off-by: Luiz Capitulino <lcapitul...@redhat.com> > Signed-off-by: Viktor Mihajlovski <mihaj...@linux.vnet.ibm.com> > --- > cpus.c | 38 ++++++++++++++++++++++++++++++ > qapi-schema.json | 70 > ++++++++++++++++++++++++++++++++++++++++++++++++++++++++ > 2 files changed, 108 insertions(+) Reviewed-by: Cornelia Huck <coh...@redhat.com>
