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scx_rustland: allow to disable the slice boost completely

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Allow to specify `-b 0` to completely disable the slice boost logic and
fallback to standard vruntime-based scheduler with variable time slice.

In this way interactive tasks will not get over-prioritized over the
other tasks in the system.

Having this option can help to easily track down potential performance
regressions arising for over-prioritizing interactive tasks.

Signed-off-by: Andrea Righi <andrea.righi@canonical.com>
This commit is contained in:
Andrea Righi 2024-01-22 08:46:21 +01:00
parent b4269452fc
commit ab1c4f66a8
1 changed files with 3 additions and 3 deletions
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6
scheds/rust/scx_rustland/src/main.rs
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@ -95,7 +95,7 @@ struct Opts {
/// Default time slice boost is 100, which means interactive tasks will get a 100x priority
/// boost to run respect to non-interactive tasks.
///
/// Use "1" to disable time slice boost and fallback to the standard vruntime-based scheduling.
/// Use "0" to disable time slice boost and fallback to the standard vruntime-based scheduling.
#[clap(short = 'b', long, default_value = "100")]
slice_boost: u64,
@ -221,8 +221,8 @@ impl<'a> Scheduler<'a> {
// Save the default time slice (in ns) in the scheduler class.
let slice_ns = opts.slice_us * MSEC_PER_SEC;
// Slice booster (must be >= 1).
let slice_boost = opts.slice_boost.max(1);
// Slice booster (0 = disabled).
let slice_boost = opts.slice_boost;
let eff_slice_boost = slice_boost;
// Scheduler task pool to sort tasks by vruntime.