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authorValentin Schneider <vschneid@redhat.com>2023-07-07 18:21:55 +0100
committerSteven Rostedt (Google) <rostedt@goodmis.org>2023-08-22 05:13:29 -0400
commitfa828efb9cb3afae46163b02988fbb4fff1122bc (patch)
treea1be101b14ab748a24593a97b38824f920191791 /Documentation/trace
parent38c6f68083895e5e732239dbb277e87fa76f5cd3 (diff)
tracing/filters: Document cpumask filtering
Cpumask, scalar and CPU fields can now be filtered by a user-provided cpumask, document the syntax. Link: https://lkml.kernel.org/r/20230707172155.70873-10-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> Signed-off-by: Valentin Schneider <vschneid@redhat.com> Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
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diff --git a/Documentation/trace/events.rst b/Documentation/trace/events.rst
index f5fcb8e1218f..34108d5a55b4 100644
--- a/Documentation/trace/events.rst
+++ b/Documentation/trace/events.rst
@@ -219,6 +219,20 @@ the function "security_prepare_creds" and less than the end of that function.
The ".function" postfix can only be attached to values of size long, and can only
be compared with "==" or "!=".
+Cpumask fields or scalar fields that encode a CPU number can be filtered using
+a user-provided cpumask in cpulist format. The format is as follows::
+
+ CPUS{$cpulist}
+
+Operators available to cpumask filtering are:
+
+& (intersection), ==, !=
+
+For example, this will filter events that have their .target_cpu field present
+in the given cpumask::
+
+ target_cpu & CPUS{17-42}
+
5.2 Setting filters
-------------------