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| author |   Steven Rostedt (VMware) <rostedt@goodmis.org> | 2020-09-24 12:30:20 -0400 |
|---|---|---|
| committer | Steven Rostedt (VMware) <rostedt@goodmis.org> | 2020-09-25 18:01:35 -0400 |
| commit | afbe7973173a7ce0a68af8b33e44c967582297be (patch) | |
| tree | e3275757d5e04d8adde4d731c3e159d0d0bcc6f1 /tools/perf/scripts/python/export-to-postgresql.py | |
| parent | tracing/boot: Initialize per-instance event list in early boot (diff) | |
| download | wireguard-linux-afbe7973173a7ce0a68af8b33e44c967582297be.tar.xz wireguard-linux-afbe7973173a7ce0a68af8b33e44c967582297be.zip | |
tracepoints: Add helper to test if tracepoint is enabled in a header
As tracepoints are discouraged from being added in a header because it can
cause side effects if other tracepoints are in headers, as well as bloat the
kernel as the trace_<tracepoint>() function is not a small inline, the common
workaround is to add a function call that calls a wrapper function in a
C file that then calls the tracepoint. But as function calls add overhead,
this function should only be called when the tracepoint in question is
enabled. To get around this overhead, a static_branch can be used to only
have the tracepoint wrapper get called when the tracepoint is enabled.
Add a tracepoint_enabled(tp) macro that gets passed the name of the
tracepoint, and this becomes a static_branch that is enabled when the
tracepoint is enabled and is a nop when the tracepoint is disabled.
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Diffstat (limited to 'tools/perf/scripts/python/export-to-postgresql.py')
0 files changed, 0 insertions, 0 deletions