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| author | Steven Rostedt <srostedt@redhat.com> | 2011-12-20 04:01:00 +0100 |
|---|---|---|
| committer | Steven Rostedt <rostedt@goodmis.org> | 2011-12-21 13:26:49 +0100 |
| commit | 762e1207889b3451c50d365b741af6f9ce958886 (patch) | |
| tree | dcb1f4eacbddfa342181a29a97eb9b994922b009 /kernel/trace | |
| parent | ftrace: Allow access to the boot time function enabling (diff) | |
| download | linux-762e1207889b3451c50d365b741af6f9ce958886.tar.xz linux-762e1207889b3451c50d365b741af6f9ce958886.zip | |
tracing: Have stack tracing set filtered functions at boot
Add stacktrace_filter= to the kernel command line that lets
the user pick specific functions to check the stack on.
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'kernel/trace')
| -rw-r--r-- | kernel/trace/trace_stack.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/kernel/trace/trace_stack.c b/kernel/trace/trace_stack.c index 0398b7c7afd6..d4545f49242e 100644 --- a/kernel/trace/trace_stack.c +++ b/kernel/trace/trace_stack.c @@ -13,6 +13,9 @@ #include <linux/sysctl.h> #include <linux/init.h> #include <linux/fs.h> + +#include <asm/setup.h> + #include "trace.h" #define STACK_TRACE_ENTRIES 500 @@ -352,8 +355,13 @@ stack_trace_sysctl(struct ctl_table *table, int write, return ret; } +static char stack_trace_filter_buf[COMMAND_LINE_SIZE+1] __initdata; + static __init int enable_stacktrace(char *str) { + if (strncmp(str, "_filter=", 8) == 0) + strncpy(stack_trace_filter_buf, str+8, COMMAND_LINE_SIZE); + stack_tracer_enabled = 1; last_stack_tracer_enabled = 1; return 1; @@ -375,6 +383,9 @@ static __init int stack_trace_init(void) trace_create_file("stack_trace_filter", 0444, d_tracer, NULL, &stack_trace_filter_fops); + if (stack_trace_filter_buf[0]) + ftrace_set_early_filter(&trace_ops, stack_trace_filter_buf, 1); + if (stack_tracer_enabled) register_ftrace_function(&trace_ops); |