Commit fa828efb authored by Valentin Schneider's avatar Valentin Schneider Committed by Steven Rostedt (Google)
Browse files

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: default avatarValentin Schneider <vschneid@redhat.com>
Signed-off-by: default avatarSteven Rostedt (Google) <rostedt@goodmis.org>
parent 38c6f680

Documentation/trace/events.rst

+14 −0
Original line number Diff line number Diff line
@@ -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

-------------------