Re: [libvirt] [PATCH RFC v3 0/6] support cpu bandwidth in libvirt
On Mon, 2011-07-18 at 17:34 +0800, Wen Congyang wrote:
TODO:
1. We create sub directory for each vcpu in cpu subsystem. So
we should recalculate cpu.shares for each vcpu.
Is the per vcpu cgroup optional? I.e., is is possible to set the period
and quota for the entire domain and let the host scheduler deal with
it?
Caveat: Domain level CFS shares seems to work well--"work well" here
means "behaves as I expected" ;-). I have no experience with the
period/quota facility and libvirt domains, so maybe it doesn't make
sense to cap cpu utilization at the domain level.
Regards,
Lee
Changelog:
v3: fix some small bugs
implement the simple way
v2: almost rewrite the patchset to support to control each vcpu's
bandwidth.
Limit quota to [-1, 2^64/1000] at the schemas level. We will
check it at cgroup level.
Wen Congyang (6):
Introduce the function virCgroupForVcpu
cgroup: Implement cpu.cfs_period_us and cpu.cfs_quota_us tuning API
Update XML Schema for new entries
qemu: Implement period and quota tunable XML configuration and
parsing
qemu: Implement cfs_period and cfs_quota's modification
doc: Add documentation for new cputune elements period and quota
docs/formatdomain.html.in | 19 ++
docs/schemas/domain.rng | 26 +++-
src/conf/domain_conf.c | 20 ++-
src/conf/domain_conf.h | 2 +
src/libvirt_private.syms | 5 +
src/qemu/qemu_cgroup.c | 127 +++++++++++
src/qemu/qemu_cgroup.h | 4 +
src/qemu/qemu_driver.c | 259 ++++++++++++++++++++---
src/qemu/qemu_process.c | 4 +
src/util/cgroup.c | 153 +++++++++++++-
src/util/cgroup.h | 11 +
tests/qemuxml2argvdata/qemuxml2argv-cputune.xml | 2 +
12 files changed, 596 insertions(+), 36 deletions(-)
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