rcu: Set a maximum limit for back-to-back callback invocation

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Currently, if a CPU has more than 10,000 callbacks pending, it will
increase rdp->blimit to LONG_MAX.  If you are lucky, LONG_MAX is only
about two billion, but this is still a bit too many callbacks to invoke
back-to-back while otherwise ignoring the world.

This commit therefore sets a maximum limit of DEFAULT_MAX_RCU_BLIMIT,
which is set to 10,000, for rdp->blimit.

Reported-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Paul E. McKenney <paulmck@linux.ibm.com>

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This commit is contained in:

Paul E. McKenney 2019-04-10 17:01:39 -07:00

parent 12edff045b

commit d5a9a8c3bc

1 changed files with 4 additions and 3 deletions

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kernel/rcu/tree.c

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