selftests/kvm/rseq_test.c

26  * Any bug related to task migration is likely to be timing-dependent; perform
80 		 * that a migration may have occurred in between rseq and sched  in migration_worker()
81 		 * CPU ID reads.  An odd sequence count indicates a migration  in migration_worker()
83 		 * a migration occurred since the count was last read.  in migration_worker()
105 		 *  1. To allow sched_setaffinity() to prompt migration before  in migration_worker()
122 		 *     before the next round of migration.  The test's check on  in migration_worker()
123 		 *     the rseq CPU ID must wait for migration to complete in  in migration_worker()
125 		 *     will be missed if the next migration starts before the  in migration_worker()
186 		       "Only one usable CPU, task migration not possible");  in calc_min_max_cpu()
222 		 * Verify rseq's CPU matches sched's CPU.  Ensure migration  in main()
225 		 * count is odd (migration in-progress).  in main()
230 			 * i.e. if a migration is in-progress.  in main()
236 			 * in a single "no migration" window, i.e. are not reordered  in main()
254 	 * getcpu() to stabilize.  A 2:1 migration:KVM_RUN ratio is a fairly  in main()
256 	 * migrations given the 1us+ delay in the migration task.  in main()