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scx_lavd: when no_freq_scaling, always set to the max freq

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When the no_freq_scaling changes during runtime in the autopilot mode,
the last target freq set would not be 1024. So the performance mode
enabled by the autopilot mode would not run in the best profile. Hence,
we set the target freq to 1024 always when no_freq_scaling is set.

Signed-off-by: Changwoo Min <changwoo@igalia.com>
This commit is contained in:
Changwoo Min 2024-08-31 18:22:33 +09:00
parent 63a2eecce8
commit 4a7b806dd2
1 changed files with 9 additions and 5 deletions
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14
scheds/rust/scx_lavd/src/bpf/main.bpf.c
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@ -2331,6 +2331,12 @@ static int calc_cpuperf_target(struct sys_stat *stat_cur,
if (!stat_cur || !taskc || !cpuc)
return -EINVAL;
if (no_freq_scaling) {
cpuc->cpuperf_task = SCX_CPUPERF_ONE;
cpuc->cpuperf_avg = SCX_CPUPERF_ONE;
return 0;
}
/*
* We determine the clock frequency of a CPU using two factors: 1) the
* current CPU utilization (cpuc->util) and 2) the current task's
@ -2428,7 +2434,7 @@ void BPF_STRUCT_OPS(lavd_tick, struct task_struct *p_run)
* task continues to run.
*/
freq_out:
if (!no_freq_scaling && !preempted)
if (!preempted)
try_decrease_cpuperf_target(cpuc_run);
}
@ -2514,10 +2520,8 @@ void BPF_STRUCT_OPS(lavd_running, struct task_struct *p)
* urgently increases according to task's target but it decreases
* gradually according to EWMA of past performance targets.
*/
if (!no_freq_scaling) {
calc_cpuperf_target(stat_cur, taskc, cpuc);
try_increase_cpuperf_target(cpuc);
}
calc_cpuperf_target(stat_cur, taskc, cpuc);
try_increase_cpuperf_target(cpuc);
/*
* Update running task's information for preemption