When finding a victim candidate for preemption, a randomly chosen
candidate could be out of valid CPU range due to CPU offline, etc. In
this case, try another CPU randomly.
Signed-off-by: Changwoo Min <changwoo@igalia.com>
The doc of scx_layered `Opt` is out of sync.
Implement attribute macro #stat_doc to generate doc from the `desc`
property.
Apply #stat_doc to `LayerStats` and `SysStats in scx_layered.
Signed-off-by : Ming Yang <minos.future@gmail.com>
We used the average performance criticality of tasks as a threshold to
determine the proper core type (big or little). However, if the big
core's compute capacity is not half of the total compute capacity, such
an average-based determination becomes suboptimal. If fewer tasks are
classified as performance-critical tasks and requested to run on big
cores, the big cores would be wasted by stealing arbitrary
non-performance-critical tasks. That could result in performance
instability.
Hence, determine the threshold more accurately by considering (active)
big cores' compute capacity and the (approximated) distribution of
performance criticality of tasks.
Signed-off-by: Changwoo Min <changwoo@igalia.com>
As a preparation to improve the performance criticality logic, we first
rename "avg_perf_cri" to "thr_perf_cri" since average is no longer the
threshold.
Signed-off-by: Changwoo Min <changwoo@igalia.com>
Enabling the `caching-build` workflow on `merge_group` actions. This is required to enable merge queues which should make merging lots of PRs while getting full CI testing possible. Currently `lint` is the only required check but we will add more in future.
* Fix a couple of misc errors in build scripts.
* Tweak scripts/kconfigs to make bpftrace work.
* Update how CI caching works to make builds faster (6 minute turnaround
time)
* Update CI config to generate per-scheduler debug archives w/ guest
dmesg/scheduler stdout, guest stdout, bpftrace script output,
veristat output.
* Update build scripts to accept the following:
** VNG RW -- write to host filesystem (better caching, logging).
* For stress tests in particular (via ini config):
** QEMU Opts -- to facilitate reproducing bugs (i.e. high core count).
** bpftrace scripts -- specify bpftrace scripts to run during stress
tests.
* enable bpftrace when using stress tests
update meson/stress test runner to enable
running bpftrace scripts while running
stress tests.
* disable layered stats output on ci
Add an enum for the layer growth algo to the bpf layer config. This will
be useful for implementing topology aware layer growth algorithms.
When selecting an idle CPU the current logic tries to keep tasks
local to LLC/NUMA node. However, for certain growth algorithms (ex:
RoundRobin) this is suboptimal. Adding the layer growth algorithm
will allow for different paths for CPU selection in the idle/preemption
paths.
Signed-off-by: Daniel Hodges <hodges.daniel.scott@gmail.com>
enable build and test outside src dir
add a option `build_outside_src`, defaulted
to false, to undo a tweak to enable meson to work
well with builds within src dir.
this makes some tools work better + enables
moving builds etc. to /tmp (faster for iteration if
ramdisk)
The gpu-topology feature can be enabled to include GPUs when generating
a topology-map. Disabling the feature will remove the nvml-wrapper
dependency as well as GPU-specific code in topology.rs.
Most of the code was moved to a new module in rust/scx_utils/src/gpu.rs
but some of it was kept in topology.rs and hidden behind #[cfg(feature =
"gpu-topology")].
Signed-off-by: Fredrik Lönnegren <fredrik@frelon.se>
* enable ide's etc. to work on the bpf.c files
this makes it so that clangd and ide tools which use clangd
can work on the bpf.c code.
nothing should actually be changed outside of that ide/editor
environment, all the changes are ifdef'ed on LSP which is set
in the added .clangd file.
* move intf include out of both sides of ifdef toggle
* make ci nicer
Replace build scheds and merged with caching build, and rename
caching build to build-and-test.
This should make the CI reports on PRs be nice and specific
(i.e. at a glance, know what passes and what fails).
It also keeps PR CI jobs up to date (as folks edit things) and
has them all use one config/24.04 etc.
* prevent untar permission errors from causing cache misses
When preempting restrict preemption to the current layer cpumask. This
may reduce the amount of preemption, but cause better cache locality
of preempted tasks.
Signed-off-by: Daniel Hodges <hodges.daniel.scott@gmail.com>
I think I see PRs being harder to write because all parts of a CI job
are cancelled when one fails.
I think I am also starting to see that we have enough largely disjoint
moving pieces that there will often be one that is failing stress
tests at any time.
Make CI run all stress tests always to address this.
Remove cast_mask() function distributed throughout different schedulers
and add it in common.bpf.h so every scheduler can reference it once they
need to.
Signed-off-by: I Hsin Cheng <richard120310@gmail.com>
This reverts commit 809d39aa7f.
Dispatching all kthreads directly doesn't really help much at preventing
stalls with the stress-ng fork stressor, so revert this commit. A better
workaround will be provided in the next commit.
Signed-off-by: Andrea Righi <andrea.righi@linux.dev>
Exposes an option --monitor-no-dbus in scx_loader that will monitor CPU
utilization and start scx_lavd when any CPU exceeds 90% for more than 5
seconds. scx_lavd will be terminated if all CPUs are below 90% for
more than 30 seconds. When this flag is specified, scx_loader's
dbus functionality is not utilized.
