Messages in this thread | | | Date | Mon, 29 Jun 2020 18:16:25 -0400 | From | Steven Rostedt <> | Subject | Re: [PATCH] ring-buffer: speed up buffer resets by avoiding synchronize_rcu for each CPU |
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On Thu, 25 Jun 2020 15:34:03 +1000 Nicholas Piggin <npiggin@gmail.com> wrote:
> Batch these up so we disable all the per-cpu buffers first, then > synchronize_rcu() once, then reset each of the buffers. This brings > the time down to about 0.5s.
After applying this patch, running tools/testing/selftests/ftracetest went from 5 minutes and 35 seconds to 5 minutes 5 seconds to complete on my 4 core (8 with hyperthreading) machine! That's almost a 10% drop!
Thanks, I'm definitely applying this for the next merge window.
-- Steve
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