sched_ext: Add an event, SCX_EV_BYPASS_ACTIVATE

Add a core event, SCX_EV_BYPASS_ACTIVATE, which represents how many
times the bypass mode has been triggered.

Signed-off-by: Changwoo Min <changwoo@igalia.com>
Signed-off-by: Tejun Heo <tj@kernel.org>

diff --git a/kernel/sched/ext.c b/kernel/sched/ext.c
index c72ba405a1d38a082ab48e7ba273b8a5b0572b3d..377c2e99cf4fa0984434ea67533fc014fbec81c8 100644 (file)
--- a/kernel/sched/ext.c
+++ b/kernel/sched/ext.c
@@ -1467,6 +1467,11 @@ struct scx_event_stats {
         * is dispatched to a local DSQ when exiting.
         */
        u64             SCX_EV_ENQ_SKIP_EXITING;
+
+       /*
+        * The number of times the bypassing mode has been activated.
+        */
+       u64             SCX_EV_BYPASS_ACTIVATE;
 };
 
 /*
@@ -4399,6 +4404,7 @@ static void scx_ops_bypass(bool bypass)
                WARN_ON_ONCE(scx_ops_bypass_depth <= 0);
                if (scx_ops_bypass_depth != 1)
                        goto unlock;
+               scx_add_event(SCX_EV_BYPASS_ACTIVATE, 1);
        } else {
                scx_ops_bypass_depth--;
                WARN_ON_ONCE(scx_ops_bypass_depth < 0);
@@ -4994,6 +5000,7 @@ static void scx_dump_state(struct scx_exit_info *ei, size_t dump_len)
        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);
+       scx_dump_event(s, &events, SCX_EV_BYPASS_ACTIVATE);
 
        if (seq_buf_has_overflowed(&s) && dump_len >= sizeof(trunc_marker))
                memcpy(ei->dump + dump_len - sizeof(trunc_marker),
@@ -7131,6 +7138,7 @@ __bpf_kfunc void scx_bpf_events(struct scx_event_stats *events,
                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);
+               scx_agg_event(&e_sys, e_cpu, SCX_EV_BYPASS_ACTIVATE);
        }
 
        /*