This patch series removes kvm tool's periodic tick function in favour of a
thread that blocks waiting for input. The paths used for handling input are the
same as when using a periodic tick, but they're not called unless there is
actually input to be processed.
On extremely slow platforms (eg FPGAs) the overhead involved in handling the
timer tick means it is possible to make progress at all inside the VM! This
patch addresses this problem.
In doing this there are a number of small tidyups/cleanups that made sense, too:
- Use a #define for maximum number of term devices
- Refactor the method by which the virtio console handles input in order not to
- handle input too early
- handle input multiple times if the worker thread didn't immediately start
work.
- Rename the periodic_poll function to reflect the functional change
---
Changes since V1:
- s/kvm__arm_read_term/kvm__arch_read_term/ in patch2's coverletter
- make term_poll_thread static
- Added Marc's ack
Changes since V2:
- force the flushing of the tx queue for serial console emulation
- test that this doesn't degrade performance considerably
Jonathan Austin (3):
kvm tools: use #define for maximum number of terminal devices
kvm tools: remove periodic tick in favour of a polling thread
kvm tools: stop virtio console doing unnecessary input handling
tools/kvm/arm/kvm.c | 2 +-
tools/kvm/builtin-run.c | 13 -----------
tools/kvm/hw/serial.c | 10 +--------
tools/kvm/include/kvm/kvm.h | 2 +-
tools/kvm/kvm.c | 50 -------------------------------------------
tools/kvm/powerpc/kvm.c | 2 +-
tools/kvm/term.c | 38 +++++++++++++++++++++++++++++---
tools/kvm/virtio/console.c | 23 +++++++++++++++++---
tools/kvm/x86/kvm.c | 2 +-
9 files changed, 60 insertions(+), 82 deletions(-)
--
1.7.9.5
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