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ftrace/graph: Add ftrace_graph_max_depth kernel parameter

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Early trace callgraphs can be extremely large on systems with
several seconds of boot time. The max_depth parameter limits how
deep the graph trace goes and reduces the output size. This
parameter is the same as the max_graph_depth file in tracefs.

Link: http://lkml.kernel.org/r/1488499935-23216-1-git-send-email-todd.e.brandt@linux.intel.com

Signed-off-by: Todd Brandt <todd.e.brandt@linux.intel.com>
[ changed comments about debugfs to tracefs ]
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
This commit is contained in:
Todd Brandt
2017-03-02 16:12:15 -08:00
committed by Steven Rostedt (VMware)
parent bf7165cfa2
commit 65a50c6562
2 changed files with 15 additions and 0 deletions
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9
kernel/trace/ftrace.c
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@@ -4415,6 +4415,15 @@ static int __init set_graph_notrace_function(char *str)
}
__setup("ftrace_graph_notrace=", set_graph_notrace_function);
static int __init set_graph_max_depth_function(char *str)
{
if (!str)
return 0;
fgraph_max_depth = simple_strtoul(str, NULL, 0);
return 1;
}
__setup("ftrace_graph_max_depth=", set_graph_max_depth_function);
static void __init set_ftrace_early_graph(char *buf, int enable)
{
int ret;