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| author |  Yordan Karadzhov (VMware) <y.karadz@gmail.com>
| 2021-04-15 21:18:51 +0300 |
|---|---|---|
| committer |  Steven Rostedt (VMware) <rostedt@goodmis.org>
| 2021-04-15 14:50:02 -0400 |
| commit | 20344c54d1c7ab7428e312bbe9b0097750875002 (patch) | |
| tree | 0e9cccc4e78351f7ec7705316147adaae2f1257c /kernel/trace | |
| parent | tracing: Define new ftrace event "func_repeats" (diff) | |
| download | linux-20344c54d1c7ab7428e312bbe9b0097750875002.tar.gz linux-20344c54d1c7ab7428e312bbe9b0097750875002.tar.bz2 linux-20344c54d1c7ab7428e312bbe9b0097750875002.zip | |
tracing: Add "last_func_repeats" to struct trace_array
The field is used to keep track of the consecutive (on the same CPU) calls
of a single function. This information is needed in order to consolidate
the function tracing record in the cases when a single function is called
number of times.
Link: https://lkml.kernel.org/r/20210415181854.147448-4-y.karadz@gmail.com
Signed-off-by: Yordan Karadzhov (VMware) <y.karadz@gmail.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Diffstat (limited to 'kernel/trace')
| -rw-r--r-- | kernel/trace/trace.c | 1 | ||||
| -rw-r--r-- | kernel/trace/trace.h | 12 |
2 files changed, 13 insertions, 0 deletions
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index 507a30bf26e4..82833be07c1e 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -9104,6 +9104,7 @@ static int __remove_instance(struct trace_array *tr) ftrace_clear_pids(tr); ftrace_destroy_function_files(tr); tracefs_remove(tr->dir); + free_percpu(tr->last_func_repeats); free_trace_buffers(tr); for (i = 0; i < tr->nr_topts; i++) { diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h index 6a5b4c2a0fa7..a4f1b66049fd 100644 --- a/kernel/trace/trace.h +++ b/kernel/trace/trace.h @@ -263,6 +263,17 @@ struct cond_snapshot { }; /* + * struct trace_func_repeats - used to keep track of the consecutive + * (on the same CPU) calls of a single function. + */ +struct trace_func_repeats { + unsigned long ip; + unsigned long parent_ip; + unsigned long count; + u64 ts_last_call; +}; + +/* * The trace array - an array of per-CPU trace arrays. This is the * highest level data structure that individual tracers deal with. * They have on/off state as well: @@ -358,6 +369,7 @@ struct trace_array { #ifdef CONFIG_TRACER_SNAPSHOT struct cond_snapshot *cond_snapshot; #endif + struct trace_func_repeats __percpu *last_func_repeats; }; enum { |