Add a per layer config for different implementations of layer growth
algorithms. Convert the existing default logic into a default layer
growth algorithm and add a linear implementation.
Signed-off-by: Daniel Hodges <hodges.daniel.scott@gmail.com>
Refactor some BPF code to make verification easier on older kernels.
This is to make it easier to maintain backports.
Signed-off-by: Daniel Hodges <hodges.daniel.scott@gmail.com>
meson build script was building each rust sub-project under rust/ and
scheds/rust/ separately. This means that each rust project is built
independently which leads to a couple problems - 1. There are a lot of
shared dependencies but they have to be built over and over again for each
proejct. 2. Concurrency management becomes sad - we either have to unleash
multiple cargo builds at the same time possibly thrashing the system or
build one by one.
We've been trying to solve this from meson side in vain. Thankfully, in
issue #546, @vimproved suggested using cargo workspace which makes the
sub-projects share the same target directory and built together by the same
cargo instance while still allowing each project to behave independently for
development and publishing purposes.
Make the following changes:
- Create two cargo workspaces - one under rust/, the other under
scheds/rust/. Each contains all rust projects underneath it.
- Don't let meson descend into rust/. These are libraries used by the rust
schedulers. No need to build them from meson. Cargo will build them as
needed.
- Change the rust_scheds build target to invoke `cargo build` in
scheds/rust/ and let cargo do its thing.
- Remove per-scheduler meson.build files and instead generate custom_targets
in scheds/rust/meson.build which invokes `cargo build -p $SCHED`.
- This changes rust binary directory. Update README and
meson-scripts/install_rust_user_scheds accordingly.
- Remove per-scheduler Cargo.lock as scheds/rust/Cargo.lock is shared by all
schedulers now.
- Unify .gitignore handling.
The followings are build times on Ryzen 3975W:
Before:
________________________________________________________
Executed in 165.93 secs fish external
usr time 40.55 mins 2.71 millis 40.55 mins
sys time 3.34 mins 36.40 millis 3.34 mins
After:
________________________________________________________
Executed in 36.04 secs fish external
usr time 336.42 secs 0.00 millis 336.42 secs
sys time 36.65 secs 43.95 millis 36.61 secs
Wallclock time is reduced 5x and CPU time 7x.
Let's make it a bit easier to use:
- Shorten exported names by changing the prefix from ScxStats to Stats. This
should be distinctive enough and more inline with how most libraries name
their exports.
- Importing the right set of traits can be tricky. Introduce prelude module
so that importing is a bit less painful.
And move related ops into it. This is a bit more natural and will also allow
doing other operaitons (e.g. describing stats) without launching the server.
The meaning of SCX_OPS_ENQ_LAST will change with future kernel updates and
enqueueing on local DSQ will no longer be sufficient to avoid stalls. No
reason to do it anyway. Just drop it.
Fix a bug introduced in #510 where it assumed core ids are incremental.
This refactors the core ordering for layers to be far more simple and
provide some space for layer core isolation in low utilization.
Signed-off-by: Daniel Hodges <hodges.daniel.scott@gmail.com>
Currently the core selection logic in scx_layered uses the first
available core in the bitmask. This is suboptimal when the scheduler is
configured with specific NUMA/LLC restrictions. The ideal core selection
logic should try to find the least used cores within the preferred
scheduling domain and allocate new cpus from shared cores within that
domain.
Signed-off-by: Daniel Hodges <hodges.daniel.scott@gmail.com>
- If --monitor is specified with layer specs, the scheduler also starts
stats monitoring on a thread.
- Standalone monitoring mode no longer exits when the scheduler isn't there.
Instead of keeping one copy of sched_stats, each stats server session
carries their own so that stats can be generated independently by each
client at any interval. CPU allocation min/max tracking is broken for now.
Fix the uninitialized variable "layer" in the function match_layer which
caused the compiling process to fail. "layer" is supposed to be the same
as "&layers[layer_id]".
Signed-off-by: I Hsin Cheng <richard120310@gmail.com>
- Allow no-value user attributes which are automatically assigned "true"
when specified.
- Make "top" attribute string "true" instead of bool true for consistency.
Testing for existence is always enough for value-less attributes.
- Don't drop leading "_" from user attribute names when storing in dicts.
Dropping makes things more confusing.
- Add "_om_skip" to scx_layered fields which don't jive well with OM.
scxstats_to_openmetrics.py is updated accordignly and no longer generates
warnings on those fields.
- Examples and README updated accordingly.
