tracing/filters: Optimise CPU vs cpumask filtering when the user mask is a single CPU

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Steven noted that when the user-provided cpumask contains a single CPU,
then the filtering function can use a scalar as input instead of a
full-fledged cpumask.

In this case we can directly re-use filter_pred_cpu(), we just need to
transform '&' into '==' before executing it.

Link: https://lkml.kernel.org/r/20230707172155.70873-8-vschneid@redhat.com

Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Juri Lelli <juri.lelli@redhat.com>
Cc: Daniel Bristot de Oliveira <bristot@redhat.com>
Cc: Marcelo Tosatti <mtosatti@redhat.com>
Cc: Leonardo Bras <leobras@redhat.com>
Cc: Frederic Weisbecker <frederic@kernel.org>
Suggested-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Valentin Schneider <vschneid@redhat.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>

...

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Valentin Schneider 2023-07-07 18:21:53 +01:00 • committed by Steven Rostedt (Google)

parent ca77dd8ce4

commit 1cffbe6c62

1 changed files with 7 additions and 2 deletions

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kernel/trace/trace_events_filter.c

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