Re: [Qemu-devel] [PATCHv2 2/3] qmp: add query-cpus-fast

2018-02-14 Thread Eric Blake
On 02/13/2018 11:18 AM, Viktor Mihajlovski wrote: From: Luiz Capitulino 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

Re: [Qemu-devel] [PATCHv2 2/3] qmp: add query-cpus-fast

2018-02-14 Thread Cornelia Huck
On Tue, 13 Feb 2018 18:18:47 +0100 Viktor Mihajlovski wrote: > From: Luiz Capitulino > > 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

[Qemu-devel] [PATCHv2 2/3] qmp: add query-cpus-fast

2018-02-13 Thread Viktor Mihajlovski
From: Luiz Capitulino 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