forked from luck/tmp_suning_uos_patched
4babd855fd
When rcutorture is built in to the kernel, an earlier patch detects that and raises the priority of RCU's kthreads to allow rcutorture's RCU priority boosting tests to succeed. However, if rcutorture is built as a module, those priorities must be raised manually via the rcutree.kthread_prio kernel boot parameter. If this manual step is not taken, rcutorture's RCU priority boosting tests will fail due to kthread starvation. One approach would be to raise the default priority, but that risks breaking existing users. Another approach would be to allow runtime adjustment of RCU's kthread priorities, but that introduces numerous "interesting" race conditions. This patch therefore instead detects too-low priorities, and prints a message and disables the RCU priority boosting tests in that case. Signed-off-by: Joel Fernandes (Google) <joel@joelfernandes.org> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> |
||
|---|---|---|
| .. | ||
| Kconfig | ||
| Kconfig.debug | ||
| Makefile | ||
| rcu_segcblist.c | ||
| rcu_segcblist.h | ||
| rcu.h | ||
| rcuperf.c | ||
| rcutorture.c | ||
| srcutiny.c | ||
| srcutree.c | ||
| sync.c | ||
| tiny.c | ||
| tree_exp.h | ||
| tree_plugin.h | ||
| tree.c | ||
| tree.h | ||
| update.c | ||