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.
Scheduling sample reporting is switched to use scx_stats. This makes the
scheduler run without making too much noise while still allowing monitoring
on demand. It can also make introspection more dynamic - e.g. it shouldn't
be difficult to add other monitoring commands which take scheduling samples
based on different criteria or add other types of staisitcs.
--nr_sched-samples is replaced with --monitor-nr-samples.
A lot of scx_lavd's options do not clearly explain what they do. Add
some short explanations, clean up the existing ones, and direct the user
to read the in-code documentation for more info.
This option chooses little (effiency) cores over big (performance) cores
to save power consumption for core compaction.
Signed-off-by: Changwoo Min <changwoo@igalia.com>
The changes include 1) chopping down a big function into smaller ones
for readability and maintainability and 2) using the interior mutability
pattern (Cell and RefCell) to avoid unnecessary clone() calls. There
are no functional changes.
Signed-off-by: Changwoo Min <changwoo@igalia.com>
Put a performance-critical task to a performance critical queue and a
regular task to a regular queue.
Signed-off-by: Changwoo Min <changwoo@igalia.com>
- Use .enumerate() consistently while building the cpu_fids vector.
- Use .then_with() to chain .cmp() when sorting cpu_fids.
Both reduce visual clutter.
With optimizations of calculatring ineligibility duration, now the
scheduler works well under heavy load without 2-level scheduling, so we
drop it for simplicitiy.
Signed-off-by: Changwoo Min <changwoo@igalia.com>
This commit include a few changes:
- treat a new forked task more conservatively
- defer the execution of more tasks for longer time using ineligibility duration
- consider if a task is waken up in calculating ineligibility duration
L or R: Latency-critical, Regular
H or I: performance-Hungry, performance-Insensitive
B or T: Big, liTtle
E or G: Eligible, Greedy
P or N: Preemption, Not
Signed-off-by: Changwoo Min <changwoo@igalia.com>
Tuning the time slice under high load and change the kick/tick margins
for preemption more conservative. Especially, aggressive IPI-based
preemption (kick) causes performance unstability.
Signed-off-by: Changwoo Min <changwoo@igalia.com>
Instead of using coarse-grained log(), let's directly use the ratio of
task's service time. Also, the virtual dealine equation is also updated
to reflect this change.
Signed-off-by: Changwoo Min <changwoo@igalia.com>
