This change adds stress-ng as a load test for schedulers when running in
CI. It will run stress-ng while schedulers are being tested with a
reasonable amount of work. At the end of the run the stress-ng metrics
are collected for later analysis. However, since these results may be
running in a VM they may not be super robust.
If we try to cross-build scx on builders with older versions of system's
linux headers (such as those provided by linux-libc-headers in older
releases of Ubuntu), we may hit build failures, due to the different
kernel ABI, such as:
error: invalid use of undefined type ‘struct btf_enum64’
To address this, introduce a new build option called "kernel_headers"
that allows to specify a custom path for the kernel headers required
during the build process.
Signed-off-by: Andrea Righi <andrea.righi@canonical.com>
This is to potentinally reduce issues with folks
using different versions of libbpf at runtime.
This also:
- makes static linking of libbpf the default
- adds steps in `meson setup` to fetch libbpf and make it
This reverts commit 5b9b953e3c, reversing
changes made to a7b39f24e2.
The current git submodule approach is a bit cumbersome and doesn't provide a
unified build environment for both libbpf and scx scheds. Also, the build
instruction doesn't seem to work. Let's revert it for now.
Use virtme-ng to run the schedulers after they're built; virtme-ng
allows to pick an arbitrary sched-ext enabled kernel and run it
virtualizing the entire user-space root filesystem, so we can basically
exceute the recompiled schedulers inside such kernel.
This should allow to catch potential run-time issue in advance (both in
the kernel and the schedulers).
The sched-ext kernel is taken from the Ubuntu ppa (ppa:arighi/sched-ext)
at the moment, since it is the easiest / fastest way to get a
precompiled sched-ext kernel to run inside the Ubuntu 22.04 testing
environment.
The schedulers are tested using the new meson target "test_sched", the
specific actions are defined in meson-scripts/test_sched.
By default each test has a timeout of 30 sec, after the virtme-ng
completes the boot (that should be enough to initialize the scheduler
and run the scheduler for some seconds), while the total lifetime of the
virtme-ng guest is set to 60 sec, after this time the guest will be
killed (this allows to catch potential kernel crashes / hangs).
If a single scheduler fails the test, the entire "test_sched" action
will be interrupted and the overall test result will be considered a
failure.
At the moment scx_layered is excluded from the tests, because it
requires a special configuration (we should probably pre-generate a
default config in the workflow actions and change the scheduler to use
the default config if it's executed without any argument).
Moreover, scx_flatcg is also temporarily excluded from the tests,
because of these known issues:
- https://github.com/sched-ext/scx/issues/49
- https://github.com/sched-ext/sched_ext/pull/101
Signed-off-by: Andrea Righi <andrea.righi@canonical.com>
Introduce an option to enable/disable the build of all the Rust
sub-projects.
This can be useful to build scx on those systems where Rust is not
fully supported (e.g., armhf).
Signed-off-by: Andrea Righi <andrea.righi@canonical.com>
