* Eduardo Habkost (ehabkost@xxxxxxxxxx) wrote: > (CCing qemu-devel) > > On Fri, Feb 02, 2018 at 09:21:59AM -0500, Luiz Capitulino wrote: > > On Fri, 2 Feb 2018 14:19:38 +0000 > > Daniel P. Berrangé <berrange@xxxxxxxxxx> wrote: > > > On Fri, Feb 02, 2018 at 12:15:54PM -0200, Eduardo Habkost wrote: > [...] > > > > It would be also interesting to update QEMU QMP documentation to > > > > clarify the arch-specific semantics of "halted". > > > > > > Any also especially clarify the awful performance implications of running > > > this particular query command. In general I would not expect query-xxx > > > monitor commands to interrupt all vcpus, so we should clearly warn about > > > this ! > > > > Or deprecate it... > > We could deprecate the expensive fields on query-cpus, and move > them to a more expensive query-cpu-state command. I believe most > users of query-cpus are only interested in qom_path, thread_id, > and topology info. Would that data be available without the bql? I ask because if it is then a small advantage to having a separate command is that the command could be marked OOB with Peter's new series and never take the lock. Dave > Markus, Eric: from the QAPI point of view, is it OK to remove > fields between QEMU versions, as long as we follow our > deprecation policy? > > -- > Eduardo > -- Dr. David Alan Gilbert / dgilbert@xxxxxxxxxx / Manchester, UK
