Messages in this thread | | | Date | Wed, 14 Oct 2009 10:15:17 -0700 | From | "Paul E. McKenney" <> | Subject | [PATCH tip/core/rcu 0/6] rcu: fix synchronize_rcu_expedited(), update docs, improve perf |
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This patchset contains a bug fix, a performance improvement, and documentation updates:
o Update Documentation/RCU/trace.txt to reflect recent changes (including the removal of rcupreempt.c).
o Fix to the severe performance problem with excessive IPIs and lock contention in presence of very large (but legal) numbers of RCU callbacks (reported by Nick Piggin).
o Stopgap fix for a bug in TREE_PREEMPT_RCU's implementation of synchronize_rcu_expedited(). This fix is correct, but no faster than synchronize_rcu().
o Add exports for the updated synchronize_rcu_expedited() implementation, which moved from a static inline in include/linux/rcupdate.h to a separately compiled function in kernel/rcutree_plugin.h.
o Add the new rnp->blocked_tasks field to the rcuhier trace file in debugfs.
o Update the Documentation/RCU/trace.txt documentation to include the rnp->blocked_tasks tracing.
I believe that this is 2.6.32 material.
Documentation/RCU/trace.txt | 22 ++- b/Documentation/RCU/trace.txt | 232 +++++------------------------------------- b/include/linux/rcutree.h | 6 - b/kernel/rcutree.c | 29 ++++- b/kernel/rcutree.h | 5 b/kernel/rcutree_plugin.h | 20 +++ b/kernel/rcutree_trace.c | 8 - kernel/rcutree_plugin.h | 3 8 files changed, 103 insertions(+), 222 deletions(-)
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