ftrace: Avoid synchronize_rcu_tasks_rude() call when not necessary

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synchronize_rcu_tasks_rude() triggers IPIs and forces rescheduling on
all CPUs. It is a costly operation and, when targeting nohz_full CPUs,
very disrupting (hence the name). So avoid calling it when 'old_hash'
doesn't need to be freed.

Link: https://lkml.kernel.org/r/20210721114726.1545103-1-nsaenzju@redhat.com

Signed-off-by: Nicolas Saenz Julienne <nsaenzju@redhat.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>

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Nicolas Saenz Julienne 2021-07-21 13:47:26 +02:00 • committed by Steven Rostedt (VMware)

parent 9528c19507

commit 68e83498cb

1 changed files with 2 additions and 1 deletions

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kernel/trace/ftrace.c

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