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| author | Paul E. McKenney <paul.mckenney@linaro.org> | 2011-01-12 23:10:23 +0100 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2011-05-06 08:16:54 +0200 |
| commit | a26ac2455ffcf3be5c6ef92bc6df7182700f2114 (patch) | |
| tree | 601697c7c3fd152a1b3f29f43d3a028fc8fefd5f /Documentation/filesystems | |
| parent | rcu: merge TREE_PREEPT_RCU blocked_tasks[] lists (diff) | |
| download | linux-a26ac2455ffcf3be5c6ef92bc6df7182700f2114.tar.xz linux-a26ac2455ffcf3be5c6ef92bc6df7182700f2114.zip | |
rcu: move TREE_RCU from softirq to kthread
If RCU priority boosting is to be meaningful, callback invocation must
be boosted in addition to preempted RCU readers. Otherwise, in presence
of CPU real-time threads, the grace period ends, but the callbacks don't
get invoked. If the callbacks don't get invoked, the associated memory
doesn't get freed, so the system is still subject to OOM.
But it is not reasonable to priority-boost RCU_SOFTIRQ, so this commit
moves the callback invocations to a kthread, which can be boosted easily.
Also add comments and properly synchronized all accesses to
rcu_cpu_kthread_task, as suggested by Lai Jiangshan.
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 'Documentation/filesystems')
| -rw-r--r-- | Documentation/filesystems/proc.txt | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/Documentation/filesystems/proc.txt b/Documentation/filesystems/proc.txt index b0b814d75ca1..60740e8ecb37 100644 --- a/Documentation/filesystems/proc.txt +++ b/Documentation/filesystems/proc.txt @@ -836,7 +836,6 @@ Provides counts of softirq handlers serviced since boot time, for each cpu. TASKLET: 0 0 0 290 SCHED: 27035 26983 26971 26746 HRTIMER: 0 0 0 0 - RCU: 1678 1769 2178 2250 1.3 IDE devices in /proc/ide |