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scx_lavd: improve CPU frequency scaling #351

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merged 6 commits into from
Jun 14, 2024
Merged

scx_lavd: improve CPU frequency scaling #351

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7046b47
scx_lavd: properly calculate task's runtime after suspend/resume
Jun 12, 2024
9d129f0
scx_lavd: rename LAVD_CPU_UTIL_INTERVAL_NS to LAVD_SYS_STAT_INTERVAL_NS
Jun 12, 2024
753f333
scx_lavd: refactoring do_update_sys_stat()
Jun 12, 2024
e6348a1
scx_lavd: improve frequency scaling logic
Jun 12, 2024
2e74b86
scx_lavd: logging cpu performance target
Jun 12, 2024
747bf2a
scx_lavd: add the design of CPU frequency scaling
Jun 12, 2024
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19 changes: 16 additions & 3 deletions scheds/rust/scx_lavd/src/bpf/intf.h
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Original file line number Diff line number Diff line change
Expand Up @@ -78,7 +78,6 @@ enum consts {
LAVD_ELIGIBLE_TIME_MAX = (LAVD_SLICE_MIN_NS >> 8),

LAVD_CPU_UTIL_MAX = 1000, /* 100.0% */
LAVD_CPU_UTIL_INTERVAL_NS = (25 * NSEC_PER_MSEC),
LAVD_CPU_ID_HERE = ((u32)-2),
LAVD_CPU_ID_NONE = ((u32)-1),
LAVD_CPU_ID_MAX = 512,
Expand All @@ -87,12 +86,13 @@ enum consts {
LAVD_PREEMPT_KICK_MARGIN = (LAVD_SLICE_MIN_NS >> 3),
LAVD_PREEMPT_TICK_MARGIN = (LAVD_SLICE_MIN_NS >> 8),

LAVD_SYS_STAT_INTERVAL_NS = (25 * NSEC_PER_MSEC),
LAVD_TC_PER_CORE_MAX_CTUIL = 500, /* maximum per-core CPU utilization */
LAVD_TC_NR_ACTIVE_MIN = 1, /* num of mininum active cores */
LAVD_TC_NR_OVRFLW = 1, /* num of overflow cores */
LAVD_TC_CPU_PIN_INTERVAL = (100 * NSEC_PER_MSEC),
LAVD_TC_CPU_PIN_INTERVAL_DIV = (LAVD_TC_CPU_PIN_INTERVAL /
LAVD_CPU_UTIL_INTERVAL_NS),
LAVD_SYS_STAT_INTERVAL_NS),

LAVD_GLOBAL_DSQ = 0,
};
Expand Down Expand Up @@ -141,6 +141,12 @@ struct cpu_ctx {
volatile u64 load_run_time_ns; /* total runtime of runnable tasks */
volatile u64 last_kick_clk; /* when the CPU was kicked */

/*
* Information for cpu hotplug
*/
u64 online_clk; /* when a CPU becomes online */
u64 offline_clk; /* when a CPU becomes offline */

/*
* Information used to keep track of latency criticality
*/
Expand All @@ -162,10 +168,16 @@ struct cpu_ctx {
volatile u8 is_online; /* is this CPU online? */
s32 cpu_id; /* cpu id */

/*
* Information for CPU frequency scaling
*/
u32 cpuperf_cur; /* CPU's current performance target */
u32 cpuperf_task; /* task's CPU performance target */
u32 cpuperf_avg; /* EWMA of task's CPU performance target */

/*
* Fields for core compaction
*
* NOTE: The followings MUST be placed at the end of this struct.
*/
struct bpf_cpumask __kptr *tmp_a_mask; /* temporary cpu mask */
struct bpf_cpumask __kptr *tmp_o_mask; /* temporary cpu mask */
Expand Down Expand Up @@ -219,6 +231,7 @@ struct task_ctx_x {
u64 avg_lat_cri; /* average latency criticality */
u64 avg_perf_cri; /* average performance criticality */
u32 nr_active; /* number of active cores */
u32 cpuperf_cur; /* CPU's current performance target */
};


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