rcu: Update rcu_bootup_announce_oddness()

This commit updates rcu_bootup_announce_oddness() to check additional
Kconfig options and module/boot parameters.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>

diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index b01a02e7a0b7b3cbc11ae582c7d86c5e3b667566..ac8dce15fd744626fb832ebbd0a877fb62940772 100644 (file)
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -536,9 +536,12 @@ void rcu_all_qs(void)
 }
 EXPORT_SYMBOL_GPL(rcu_all_qs);
 
-static long blimit = 10;       /* Maximum callbacks per rcu_do_batch. */
-static long qhimark = 10000;   /* If this many pending, ignore blimit. */
-static long qlowmark = 100;    /* Once only this many pending, use blimit. */
+#define DEFAULT_RCU_BLIMIT 10     /* Maximum callbacks per rcu_do_batch. */
+static long blimit = DEFAULT_RCU_BLIMIT;
+#define DEFAULT_RCU_QHIMARK 10000 /* If this many pending, ignore blimit. */
+static long qhimark = DEFAULT_RCU_QHIMARK;
+#define DEFAULT_RCU_QLOMARK 100   /* Once only this many pending, use blimit. */
+static long qlowmark = DEFAULT_RCU_QLOMARK;
 
 module_param(blimit, long, 0444);
 module_param(qhimark, long, 0444);

diff --git a/kernel/rcu/tree_plugin.h b/kernel/rcu/tree_plugin.h
index eb5ebdce25ffddb9173557ec484c92ca397c594c..9cb3dff78b6fdff3d3b661ab4d66fc7bdec3fc30 100644 (file)
--- a/kernel/rcu/tree_plugin.h
+++ b/kernel/rcu/tree_plugin.h
@@ -79,7 +79,9 @@ static void __init rcu_bootup_announce_oddness(void)
                pr_info("\tHierarchical RCU autobalancing is disabled.\n");
        if (IS_ENABLED(CONFIG_RCU_FAST_NO_HZ))
                pr_info("\tRCU dyntick-idle grace-period acceleration is enabled.\n");
-       if (IS_ENABLED(CONFIG_PROVE_RCU))
+       if (IS_ENABLED(CONFIG_PROVE_RCU_REPEATEDLY))
+               pr_info("\tRCU lockdep checking is permanently enabled.\n");
+       else if (IS_ENABLED(CONFIG_PROVE_RCU))
                pr_info("\tRCU lockdep checking is enabled.\n");
        if (RCU_NUM_LVLS >= 4)
                pr_info("\tFour(or more)-level hierarchy is enabled.\n");
@@ -90,8 +92,31 @@ static void __init rcu_bootup_announce_oddness(void)
                pr_info("\tBoot-time adjustment of leaf fanout to %d.\n", rcu_fanout_leaf);
        if (nr_cpu_ids != NR_CPUS)
                pr_info("\tRCU restricting CPUs from NR_CPUS=%d to nr_cpu_ids=%d.\n", NR_CPUS, nr_cpu_ids);
-       if (IS_ENABLED(CONFIG_RCU_BOOST))
-               pr_info("\tRCU kthread priority: %d.\n", kthread_prio);
+#ifdef CONFIG_RCU_BOOST
+       pr_info("\tRCU priority boosting: priority %d delay %d ms.\n", kthread_prio, CONFIG_RCU_BOOST_DELAY);
+#endif
+       if (blimit != DEFAULT_RCU_BLIMIT)
+               pr_info("\tBoot-time adjustment of callback invocation limit to %ld.\n", blimit);
+       if (qhimark != DEFAULT_RCU_QHIMARK)
+               pr_info("\tBoot-time adjustment of callback high-water mark to %ld.\n", qhimark);
+       if (qlowmark != DEFAULT_RCU_QLOMARK)
+               pr_info("\tBoot-time adjustment of callback low-water mark to %ld.\n", qlowmark);
+       if (jiffies_till_first_fqs != ULONG_MAX)
+               pr_info("\tBoot-time adjustment of first FQS scan delay to %ld jiffies.\n", jiffies_till_first_fqs);
+       if (jiffies_till_next_fqs != ULONG_MAX)
+               pr_info("\tBoot-time adjustment of subsequent FQS scan delay to %ld jiffies.\n", jiffies_till_next_fqs);
+       if (rcu_kick_kthreads)
+               pr_info("\tKick kthreads if too-long grace period.\n");
+       if (IS_ENABLED(CONFIG_DEBUG_OBJECTS_RCU_HEAD))
+               pr_info("\tRCU callback double-/use-after-free debug enabled.\n");
+       if (IS_ENABLED(CONFIG_RCU_TORTURE_TEST_SLOW_PREINIT))
+               pr_info("\tRCU debug GP pre-init slowdown %d jiffies.\n", gp_preinit_delay);
+       if (IS_ENABLED(CONFIG_RCU_TORTURE_TEST_SLOW_INIT))
+               pr_info("\tRCU debug GP init slowdown %d jiffies.\n", gp_init_delay);
+       if (IS_ENABLED(CONFIG_RCU_TORTURE_TEST_SLOW_CLEANUP))
+               pr_info("\tRCU debug GP init slowdown %d jiffies.\n", gp_cleanup_delay);
+       if (IS_ENABLED(CONFIG_RCU_EQS_DEBUG))
+               pr_info("\tRCU debug extended QS entry/exit.\n");
        rcupdate_announce_bootup_oddness();
 }