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authorPaul E. McKenney <paul.mckenney@linaro.org>2012-10-19 12:49:17 -0700
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2013-01-28 22:06:21 -0800
commit6bfc09e2327dfbffc312004c16188dbf8dfb0297 (patch)
treef36ac34ec671ea5eaa926ebabba8486bbda9c175 /kernel/rcutree.c
parent1b0048a44c502c5ab850203e6e0a6498d7d8676d (diff)
downloadlwn-6bfc09e2327dfbffc312004c16188dbf8dfb0297.tar.gz
lwn-6bfc09e2327dfbffc312004c16188dbf8dfb0297.zip
rcu: Provide RCU CPU stall warnings for tiny RCU
Tiny RCU has historically omitted RCU CPU stall warnings in order to reduce memory requirements, however, lack of these warnings caused Thomas Gleixner some debugging pain recently. Therefore, this commit adds RCU CPU stall warnings to tiny RCU if RCU_TRACE=y. This keeps the memory footprint small, while still enabling CPU stall warnings in kernels built to enable them. Updated to include Josh Triplett's suggested use of RCU_STALL_COMMON config variable to simplify #if expressions. Reported-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Paul E. McKenney <paul.mckenney@linaro.org> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
Diffstat (limited to 'kernel/rcutree.c')
-rw-r--r--kernel/rcutree.c46
1 files changed, 3 insertions, 43 deletions
diff --git a/kernel/rcutree.c b/kernel/rcutree.c
index e441b77b614e..d069430f0974 100644
--- a/kernel/rcutree.c
+++ b/kernel/rcutree.c
@@ -217,12 +217,6 @@ module_param(blimit, long, 0444);
module_param(qhimark, long, 0444);
module_param(qlowmark, long, 0444);
-int rcu_cpu_stall_suppress __read_mostly; /* 1 = suppress stall warnings. */
-int rcu_cpu_stall_timeout __read_mostly = CONFIG_RCU_CPU_STALL_TIMEOUT;
-
-module_param(rcu_cpu_stall_suppress, int, 0644);
-module_param(rcu_cpu_stall_timeout, int, 0644);
-
static ulong jiffies_till_first_fqs = RCU_JIFFIES_TILL_FORCE_QS;
static ulong jiffies_till_next_fqs = RCU_JIFFIES_TILL_FORCE_QS;
@@ -793,28 +787,10 @@ static int rcu_implicit_dynticks_qs(struct rcu_data *rdp)
return 0;
}
-static int jiffies_till_stall_check(void)
-{
- int till_stall_check = ACCESS_ONCE(rcu_cpu_stall_timeout);
-
- /*
- * Limit check must be consistent with the Kconfig limits
- * for CONFIG_RCU_CPU_STALL_TIMEOUT.
- */
- if (till_stall_check < 3) {
- ACCESS_ONCE(rcu_cpu_stall_timeout) = 3;
- till_stall_check = 3;
- } else if (till_stall_check > 300) {
- ACCESS_ONCE(rcu_cpu_stall_timeout) = 300;
- till_stall_check = 300;
- }
- return till_stall_check * HZ + RCU_STALL_DELAY_DELTA;
-}
-
static void record_gp_stall_check_time(struct rcu_state *rsp)
{
rsp->gp_start = jiffies;
- rsp->jiffies_stall = jiffies + jiffies_till_stall_check();
+ rsp->jiffies_stall = jiffies + rcu_jiffies_till_stall_check();
}
/*
@@ -857,7 +833,7 @@ static void print_other_cpu_stall(struct rcu_state *rsp)
raw_spin_unlock_irqrestore(&rnp->lock, flags);
return;
}
- rsp->jiffies_stall = jiffies + 3 * jiffies_till_stall_check() + 3;
+ rsp->jiffies_stall = jiffies + 3 * rcu_jiffies_till_stall_check() + 3;
raw_spin_unlock_irqrestore(&rnp->lock, flags);
/*
@@ -935,7 +911,7 @@ static void print_cpu_stall(struct rcu_state *rsp)
raw_spin_lock_irqsave(&rnp->lock, flags);
if (ULONG_CMP_GE(jiffies, rsp->jiffies_stall))
rsp->jiffies_stall = jiffies +
- 3 * jiffies_till_stall_check() + 3;
+ 3 * rcu_jiffies_till_stall_check() + 3;
raw_spin_unlock_irqrestore(&rnp->lock, flags);
set_need_resched(); /* kick ourselves to get things going. */
@@ -966,12 +942,6 @@ static void check_cpu_stall(struct rcu_state *rsp, struct rcu_data *rdp)
}
}
-static int rcu_panic(struct notifier_block *this, unsigned long ev, void *ptr)
-{
- rcu_cpu_stall_suppress = 1;
- return NOTIFY_DONE;
-}
-
/**
* rcu_cpu_stall_reset - prevent further stall warnings in current grace period
*
@@ -989,15 +959,6 @@ void rcu_cpu_stall_reset(void)
rsp->jiffies_stall = jiffies + ULONG_MAX / 2;
}
-static struct notifier_block rcu_panic_block = {
- .notifier_call = rcu_panic,
-};
-
-static void __init check_cpu_stall_init(void)
-{
- atomic_notifier_chain_register(&panic_notifier_list, &rcu_panic_block);
-}
-
/*
* Update CPU-local rcu_data state to record the newly noticed grace period.
* This is used both when we started the grace period and when we notice
@@ -3074,7 +3035,6 @@ void __init rcu_init(void)
cpu_notifier(rcu_cpu_notify, 0);
for_each_online_cpu(cpu)
rcu_cpu_notify(NULL, CPU_UP_PREPARE, (void *)(long)cpu);
- check_cpu_stall_init();
}
#include "rcutree_plugin.h"