rcutorture: Avoid RCU CPU stall warning and RT throttling

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Running rcuperf can result in RCU CPU stall warnings and RT throttling.
These occur because on of the real-time writer processes does
ftrace_dump() while still running at real-time priority.  This commit
therefore prevents these problems by setting the writer thread back to
SCHED_NORMAL (AKA SCHED_OTHER) before doing ftrace_dump().

In addition, this commit adds a small fixed delay before dumping ftrace
buffer in order to decrease the probability that this dumping will
interfere with other writers' grace periods.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>

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Paul E. McKenney 2016-01-30 21:32:09 -08:00

parent df37e66bfd

commit 620316e52a

1 changed files with 4 additions and 0 deletions

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kernel/rcu/rcuperf.c

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