scftorture: Count reschedule IPIs

paulmckrcu · paulmckrcu · commit c3d0258d5af2 · 2021-09-16T10:27:48.000-07:00
Currently, only those IPIs that invoke scftorture's scf_handler() IPI handler function are counted. This means that runs exercising only scftorture.weight_resched will look like they have made no forward progress, resulting in "GP HANG" complaints from the rcutorture scripting. This commit therefore increments the scf_invoked_count per-CPU counter immediately after calling resched_cpu(). Fixes: 1ac78b4 ("scftorture: Add an alternative IPI vector") Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
diff --git a/kernel/scftorture.c b/kernel/scftorture.c
@@ -341,6 +341,7 @@ static void scftorture_invoke_one(struct scf_statistics *scfp, struct torture_ra
 			cpu = torture_random(trsp) % nr_cpu_ids;
 			scfp->n_resched++;
 			resched_cpu(cpu);
+			this_cpu_inc(scf_invoked_count);
 		}
 		break;
 	case SCF_PRIM_SINGLE:

Original file line number	Diff line number	Diff line change
`@@ -341,6 +341,7 @@ static void scftorture_invoke_one(struct scf_statistics *scfp, struct torture_ra`
`341`	`341`	`cpu = torture_random(trsp) % nr_cpu_ids;`
`342`	`342`	`scfp->n_resched++;`
`343`	`343`	`resched_cpu(cpu);`
	`344`	`+ this_cpu_inc(scf_invoked_count);`
`344`	`345`	`}`
`345`	`346`	`break;`
`346`	`347`	`case SCF_PRIM_SINGLE:`