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On small systems, in the absence of readers, expedited SRCU grace periods can complete in less than a microsecond. This means that an eight-CPU system can have all CPUs doing synchronize_srcu() in a tight loop and almost always expedite. This might actually be desirable in some situations, but in general it is a good way to needlessly burn CPU cycles. And in those situations where it is desirable, your friend is the function synchronize_srcu_expedited(). For other situations, this commit adds a kernel parameter that specifies a holdoff between completing the last SRCU grace period and auto-expediting the next. If the next grace period starts before the holdoff expires, auto-expediting is disabled. The holdoff is 50 microseconds by default, and can be tuned to the desired number of nanoseconds. A value of zero disables auto-expediting. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Tested-by: Mike Galbraith <efault@gmx.de> |
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.. | ||
Makefile | ||
rcu.h | ||
rcuperf.c | ||
rcutorture.c | ||
srcu.c | ||
srcutiny.c | ||
srcutree.c | ||
sync.c | ||
tiny_plugin.h | ||
tiny.c | ||
tree_exp.h | ||
tree_plugin.h | ||
tree_trace.c | ||
tree.c | ||
tree.h | ||
update.c |