github-mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-06-02 19:43:40 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity Graph

sched_ext: Add an event, SCX_EV_DISPATCH_KEEP_LAST

Browse Source 
Add a core event, SCX_EV_DISPATCH_KEEP_LAST, which represents how many
times a task is continued to run without ops.enqueue() when
SCX_OPS_ENQ_LAST is not set.

__scx_add_event() is used since the caller holds an rq lock,
so the preemption has already been disabled.

Signed-off-by: Changwoo Min <changwoo@igalia.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Changwoo Min 2025-01-31 16:09:31 +09:00 committed by Tejun Heo
parent 9be0a1b0c8
commit 7125660bc1
1 changed files with 9 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
kernel/sched/ext.c
View File

@ -1455,6 +1455,12 @@ struct scx_event_stats {
* the meantime. In this case, the task is bounced to the global DSQ.
*/
u64 SCX_EV_DISPATCH_LOCAL_DSQ_OFFLINE;
/*
* If SCX_OPS_ENQ_LAST is not set, the number of times that a task
* continued to run because there were no other tasks on the CPU.
*/
u64 SCX_EV_DISPATCH_KEEP_LAST;
};
/*
@ -2907,6 +2913,7 @@ static int balance_one(struct rq *rq, struct task_struct *prev)
if (prev_on_rq && (!static_branch_unlikely(&scx_ops_enq_last) ||
scx_rq_bypassing(rq))) {
rq->scx.flags |= SCX_RQ_BAL_KEEP;
__scx_add_event(SCX_EV_DISPATCH_KEEP_LAST, 1);
goto has_tasks;
}
rq->scx.flags &= ~SCX_RQ_IN_BALANCE;
@ -4977,6 +4984,7 @@ static void scx_dump_state(struct scx_exit_info *ei, size_t dump_len)
scx_bpf_events(&events, sizeof(events));
scx_dump_event(s, &events, SCX_EV_SELECT_CPU_FALLBACK);
scx_dump_event(s, &events, SCX_EV_DISPATCH_LOCAL_DSQ_OFFLINE);
scx_dump_event(s, &events, SCX_EV_DISPATCH_KEEP_LAST);
if (seq_buf_has_overflowed(&s) && dump_len >= sizeof(trunc_marker))
memcpy(ei->dump + dump_len - sizeof(trunc_marker),
@ -7112,6 +7120,7 @@ __bpf_kfunc void scx_bpf_events(struct scx_event_stats *events,
e_cpu = per_cpu_ptr(&event_stats_cpu, cpu);
scx_agg_event(&e_sys, e_cpu, SCX_EV_SELECT_CPU_FALLBACK);
scx_agg_event(&e_sys, e_cpu, SCX_EV_DISPATCH_LOCAL_DSQ_OFFLINE);
scx_agg_event(&e_sys, e_cpu, SCX_EV_DISPATCH_KEEP_LAST);
}
/*