On 15.04.2016 13:53, Richard W.M. Jones wrote: > In a few places in libvirt we busy-wait for events, for example qemu > creating a monitor socket. This is problematic because: > > - We need to choose a sufficiently small polling period so that > libvirt doesn't add unnecessary delays. > > - We need to choose a sufficiently large polling period so that > the effect of busy-waiting doesn't affect the system. > > The solution to this conflict is to use an exponential backoff. > > This patch adds two functions to hide the details, and modifies a few > places where we currently busy-wait. > --- > src/fdstream.c | 10 +++--- > src/libvirt_private.syms | 2 ++ > src/qemu/qemu_agent.c | 9 +++--- > src/qemu/qemu_monitor.c | 10 +++--- > src/util/virtime.c | 81 ++++++++++++++++++++++++++++++++++++++++++++++++ > src/util/virtime.h | 11 +++++++ > 6 files changed, 111 insertions(+), 12 deletions(-) ACK. Sorry for making you send v5 to such simple patch. Michal -- libvir-list mailing list libvir-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/libvir-list