rcu: Force nohz_full tick on upon irq enter instead of exit

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There is interrupt-exit code that forces on the tick for nohz_full CPUs
failing to respond to the current grace period in a timely fashion.
However, this code must compare ->dynticks_nmi_nesting to the value 2
in the interrupt-exit fastpath.  This commit therefore moves this code
to the interrupt-entry fastpath, where a lighter-weight comparison to
zero may be used.

Reported-by: Joel Fernandes <joel@joelfernandes.org>
[ paulmck: Apply Joel Fernandes TICK_DEP_MASK_RCU->TICK_DEP_BIT_RCU fix. ]
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>

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Paul E. McKenney 2019-08-15 13:24:49 -07:00

parent 66e4c33b51

commit b200a04895

1 changed files with 5 additions and 6 deletions

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kernel/rcu/tree.c

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