On Tue, Oct 22, 2019 at 04:12:03PM +0800, yezhenyu (A) wrote: > Since qemu2.9, QEMU added three AioContext poll parameters to struct > IOThread: poll_max_ns, poll_grow and poll_shrink. These properties are > used to control iothread polling time. > > However, there isn't properly hmp commands to adjust them when the VM is > alive. It's useful to adjust them online when observing the impact of > different property value on performance. > > This patch add three hmp commands to adjust iothread poll-* properties > for special iothread: > > set_iothread_poll_max_ns: set the maximum polling time in ns; > set_iothread_poll_grow: set how many ns will be added to polling time; > set_iothread_poll_shrink: set how many ns will be removed from polling > time. > > Signed-off-by: Zhenyu Ye <yezhen...@huawei.com> > --- > hmp-commands.hx | 42 ++++++++++++++++++++ > hmp.c | 30 +++++++++++++++ > hmp.h | 3 ++ > include/sysemu/iothread.h | 6 +++ > iothread.c | 80 +++++++++++++++++++++++++++++++++++++++ > qapi/misc.json | 23 +++++++++++ > 6 files changed, 184 insertions(+)
poll-max-ns, poll-grow, poll-shrink are properties of IOThread objects. They can already be modified at runtime using: $ qemu -object iothread,id=iothread1 (qemu) qom-set /objects/iothread1 poll-max-ns 100000 I think there is no need for a patch. Stefan
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