| Commit message (Collapse) | Author | Age | |
|---|---|---|---|
| * | Preempt-RCU: CPU Hotplug handling | Paul E. McKenney | 2008-01-25 |
| | | | | | | | | | | | | This patch allows preemptible RCU to tolerate CPU-hotplug operations. It accomplishes this by maintaining a local copy of a map of online CPUs, which it accesses under its own lock. Signed-off-by: Gautham R Shenoy <ego@in.ibm.com> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Steven Rostedt <srostedt@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> | ||
| * | Preempt-RCU: implementation | Paul E. McKenney | 2008-01-25 |
| This patch implements a new version of RCU which allows its read-side critical sections to be preempted. It uses a set of counter pairs to keep track of the read-side critical sections and flips them when all tasks exit read-side critical section. The details of this implementation can be found in this paper - http://www.rdrop.com/users/paulmck/RCU/OLSrtRCU.2006.08.11a.pdf and the article- http://lwn.net/Articles/253651/ This patch was developed as a part of the -rt kernel development and meant to provide better latencies when read-side critical sections of RCU don't disable preemption. As a consequence of keeping track of RCU readers, the readers have a slight overhead (optimizations in the paper). This implementation co-exists with the "classic" RCU implementations and can be switched to at compiler. Also includes RCU tracing summarized in debugfs. [ akpm@linux-foundation.org: build fixes on non-preempt architectures ] Signed-off-by: Gautham R Shenoy <ego@in.ibm.com> Signed-off-by: Dipankar Sarma <dipankar@in.ibm.com> Signed-off-by: Paul E. McKenney <paulmck@us.ibm.com> Reviewed-by: Steven Rostedt <srostedt@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> | |||
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| The LITMUS^RT kernel. | Bjoern Brandenburg |
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