From: Changwoo Min Date: Tue, 4 Feb 2025 05:20:51 +0000 (+0900) Subject: sched_ext: Add an event, SCX_EV_ENQ_SKIP_EXITING X-Git-Tag: io_uring-6.15-20250403~149^2~39 X-Git-Url: https://git.kernel.dk/?a=commitdiff_plain;h=824d4f2dce50da4b748c1e280cb50e4b82146ce7;p=linux-block.git sched_ext: Add an event, SCX_EV_ENQ_SKIP_EXITING Add a core event, SCX_EV_ENQ_SKIP_EXITING, which represents how many times a task is enqueued to a local DSQ when exiting if SCX_OPS_ENQ_EXITING 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 Signed-off-by: Tejun Heo --- diff --git a/kernel/sched/ext.c b/kernel/sched/ext.c index cbb3d059072f..c72ba405a1d3 100644 --- a/kernel/sched/ext.c +++ b/kernel/sched/ext.c @@ -1461,6 +1461,12 @@ struct scx_event_stats { * continued to run because there were no other tasks on the CPU. */ u64 SCX_EV_DISPATCH_KEEP_LAST; + + /* + * If SCX_OPS_ENQ_EXITING is not set, the number of times that a task + * is dispatched to a local DSQ when exiting. + */ + u64 SCX_EV_ENQ_SKIP_EXITING; }; /* @@ -2068,8 +2074,10 @@ static void do_enqueue_task(struct rq *rq, struct task_struct *p, u64 enq_flags, /* see %SCX_OPS_ENQ_EXITING */ if (!static_branch_unlikely(&scx_ops_enq_exiting) && - unlikely(p->flags & PF_EXITING)) + unlikely(p->flags & PF_EXITING)) { + __scx_add_event(SCX_EV_ENQ_SKIP_EXITING, 1); goto local; + } if (!SCX_HAS_OP(enqueue)) goto global; @@ -4985,6 +4993,7 @@ static void scx_dump_state(struct scx_exit_info *ei, size_t dump_len) 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); + scx_dump_event(s, &events, SCX_EV_ENQ_SKIP_EXITING); if (seq_buf_has_overflowed(&s) && dump_len >= sizeof(trunc_marker)) memcpy(ei->dump + dump_len - sizeof(trunc_marker), @@ -7121,6 +7130,7 @@ __bpf_kfunc void scx_bpf_events(struct scx_event_stats *events, 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); + scx_agg_event(&e_sys, e_cpu, SCX_EV_ENQ_SKIP_EXITING); } /*