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| author | Valentin Schneider <vschneid@redhat.com> | 2023-07-07 19:21:55 +0200 |
|---|---|---|
| committer | Steven Rostedt (Google) <rostedt@goodmis.org> | 2023-08-22 11:13:29 +0200 |
| commit | fa828efb9cb3afae46163b02988fbb4fff1122bc (patch) | |
| tree | a1be101b14ab748a24593a97b38824f920191791 /Documentation | |
| parent | tracing/filters: Further optimise scalar vs cpumask comparison (diff) | |
| download | linux-fa828efb9cb3afae46163b02988fbb4fff1122bc.tar.xz linux-fa828efb9cb3afae46163b02988fbb4fff1122bc.zip | |
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>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/trace/events.rst | 14 |
1 files changed, 14 insertions, 0 deletions
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 ------------------- |