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| author | Pranith Kumar <bobby.prani@gmail.com> | 2014-09-22 14:00:48 -0400 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2014-10-29 10:20:05 -0700 |
| commit | 28f6569ab7d036cd4ee94c26bb76dc1b3f3fc056 (patch) | |
| tree | dd09624ed00e1f67fdd87bf670da19761ed78ea6 /Documentation/RCU/stallwarn.txt | |
| parent | 21871d7eff2c96ae67e18e00adf59d56940e2fcc (diff) | |
| download | op-kernel-dev-28f6569ab7d036cd4ee94c26bb76dc1b3f3fc056.zip op-kernel-dev-28f6569ab7d036cd4ee94c26bb76dc1b3f3fc056.tar.gz | |
rcu: Remove redundant TREE_PREEMPT_RCU config option
PREEMPT_RCU and TREE_PREEMPT_RCU serve the same function after
TINY_PREEMPT_RCU has been removed. This patch removes TREE_PREEMPT_RCU
and uses PREEMPT_RCU config option in its place.
Signed-off-by: Pranith Kumar <bobby.prani@gmail.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Diffstat (limited to 'Documentation/RCU/stallwarn.txt')
| -rw-r--r-- | Documentation/RCU/stallwarn.txt | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/Documentation/RCU/stallwarn.txt b/Documentation/RCU/stallwarn.txt index ef5a2fd..783e072 100644 --- a/Documentation/RCU/stallwarn.txt +++ b/Documentation/RCU/stallwarn.txt @@ -77,7 +77,7 @@ This message indicates that CPU 5 detected that it was causing a stall, and that the stall was affecting RCU-sched. This message will normally be followed by a stack dump of the offending CPU. On TREE_RCU kernel builds, RCU and RCU-sched are implemented by the same underlying mechanism, -while on TREE_PREEMPT_RCU kernel builds, RCU is instead implemented +while on PREEMPT_RCU kernel builds, RCU is instead implemented by rcu_preempt_state. On the other hand, if the offending CPU fails to print out a stall-warning @@ -89,7 +89,7 @@ INFO: rcu_bh_state detected stalls on CPUs/tasks: { 3 5 } (detected by 2, 2502 j This message indicates that CPU 2 detected that CPUs 3 and 5 were both causing stalls, and that the stall was affecting RCU-bh. This message will normally be followed by stack dumps for each CPU. Please note that -TREE_PREEMPT_RCU builds can be stalled by tasks as well as by CPUs, +PREEMPT_RCU builds can be stalled by tasks as well as by CPUs, and that the tasks will be indicated by PID, for example, "P3421". It is even possible for a rcu_preempt_state stall to be caused by both CPUs -and- tasks, in which case the offending CPUs and tasks will all @@ -205,10 +205,10 @@ o A CPU-bound real-time task in a CONFIG_PREEMPT kernel, which might o A CPU-bound real-time task in a CONFIG_PREEMPT_RT kernel that is running at a higher priority than the RCU softirq threads. This will prevent RCU callbacks from ever being invoked, - and in a CONFIG_TREE_PREEMPT_RCU kernel will further prevent + and in a CONFIG_PREEMPT_RCU kernel will further prevent RCU grace periods from ever completing. Either way, the system will eventually run out of memory and hang. In the - CONFIG_TREE_PREEMPT_RCU case, you might see stall-warning + CONFIG_PREEMPT_RCU case, you might see stall-warning messages. o A hardware or software issue shuts off the scheduler-clock |
