rcu: Create rcuo kthreads only for onlined CPUs

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RCU currently uses for_each_possible_cpu() to spawn rcuo kthreads,
which can result in more rcuo kthreads than one would expect, for
example, derRichard reported 64 CPUs worth of rcuo kthreads on an
8-CPU image.  This commit therefore creates rcuo kthreads only for
those CPUs that actually come online.

This was reported by derRichard on the OFTC IRC network.

Reported-by: Richard Weinberger <richard@nod.at>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
Tested-by: Paul Gortmaker <paul.gortmaker@windriver.com>

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This commit is contained in:

Paul E. McKenney 2014-07-11 11:30:24 -07:00

parent 9386c0b75d

commit 35ce7f29a4

3 changed files with 86 additions and 13 deletions

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3

kernel/rcu/tree.c

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6

kernel/rcu/tree.h

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90

kernel/rcu/tree_plugin.h

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