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Make scx_rusty interactive #261

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May 3, 2024
Merged

Make scx_rusty interactive #261

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925a69b
rusty: Use helper to lookup domain context
Byte-Lab Apr 17, 2024
7661898
rusty: Implement basic eligible deadline scheduling in rusty
Byte-Lab Apr 17, 2024
2403f60
rusty: Dynamically scale slice according to system util
Byte-Lab May 2, 2024
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39 changes: 36 additions & 3 deletions scheds/rust/scx_rusty/src/bpf/intf.h
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Original file line number Diff line number Diff line change
Expand Up @@ -34,6 +34,22 @@ enum consts {
LB_LOAD_BUCKETS = 100, /* Must be a factor of LB_MAX_WEIGHT */
LB_WEIGHT_PER_BUCKET = LB_MAX_WEIGHT / LB_LOAD_BUCKETS,

/* Time constants */
MSEC_PER_SEC = 1000LLU,
USEC_PER_MSEC = 1000LLU,
NSEC_PER_USEC = 1000LLU,
NSEC_PER_MSEC = USEC_PER_MSEC * NSEC_PER_USEC,
USEC_PER_SEC = USEC_PER_MSEC * MSEC_PER_SEC,
NSEC_PER_SEC = NSEC_PER_USEC * USEC_PER_SEC,

/* Constants used for determining a task's deadline */
DL_RUNTIME_SCALE = 2, /* roughly scales average runtime to */
/* same order of magnitude as waker */
/* and blocked frequencies */
DL_MAX_LATENCY_NS = (50 * NSEC_PER_MSEC),
DL_FREQ_FT_MAX = 100000,
DL_MAX_LAT_PRIO = 39,

/*
* When userspace load balancer is trying to determine the tasks to push
* out from an overloaded domain, it looks at the the following number
Expand Down Expand Up @@ -71,6 +87,10 @@ enum stat_idx {
/* Errors */
RUSTY_STAT_TASK_GET_ERR,

/* Deadline related stats */
RUSTY_STAT_DL_CLAMP,
RUSTY_STAT_DL_PRESET,

RUSTY_NR_STATS,
};

Expand All @@ -84,7 +104,19 @@ struct task_ctx {
u32 weight;
bool runnable;
u64 dom_active_pids_gen;
u64 running_at;
u64 deadline;

u64 sum_runtime;
u64 avg_runtime;
u64 last_run_at;

/* frequency with which a task is blocked (consumer) */
u64 blocked_freq;
u64 last_blocked_at;

/* frequency with which a task wakes other tasks (producer) */
u64 waker_freq;
u64 last_woke_at;

/* The task is a workqueue worker thread */
bool is_kworker;
Expand All @@ -110,11 +142,12 @@ struct bucket_ctx {
};

struct dom_ctx {
u64 vtime_now;
u32 id;
struct bpf_cpumask __kptr *cpumask;
struct bpf_cpumask __kptr *direct_greedy_cpumask;
struct bpf_cpumask __kptr *node_cpumask;
u32 node_id;

u64 min_vruntime;

u64 dbg_dcycle_printed_at;
struct bucket_ctx buckets[LB_LOAD_BUCKETS];
Expand Down
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