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authorAnton Vorontsov <anton.vorontsov@linaro.org>2012-07-09 17:10:42 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2012-07-17 10:07:00 -0700
commit21f679404a0c28bd5b1b3aff2a7218bbff4cb43d (patch)
tree9a5f1d0be079dfe225e2993331f9ddfac36cb7fc
parent060287b8c467bf49a594d8d669e1986c6d8d76b0 (diff)
downloadlinux-21f679404a0c28bd5b1b3aff2a7218bbff4cb43d.tar.bz2
tracing/function: Introduce persistent trace option
This patch introduces 'func_ptrace' option, now available in /sys/kernel/debug/tracing/options when function tracer is selected. The patch also adds some tiny code that calls back to pstore to record the trace. The callback is no-op when PSTORE=n. Signed-off-by: Anton Vorontsov <anton.vorontsov@linaro.org> Acked-by: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--kernel/trace/trace_functions.c25
1 files changed, 20 insertions, 5 deletions
diff --git a/kernel/trace/trace_functions.c b/kernel/trace/trace_functions.c
index c7b0c6a7db09..13770abd7a12 100644
--- a/kernel/trace/trace_functions.c
+++ b/kernel/trace/trace_functions.c
@@ -13,6 +13,7 @@
#include <linux/debugfs.h>
#include <linux/uaccess.h>
#include <linux/ftrace.h>
+#include <linux/pstore.h>
#include <linux/fs.h>
#include "trace.h"
@@ -74,6 +75,14 @@ function_trace_call_preempt_only(unsigned long ip, unsigned long parent_ip)
preempt_enable_notrace();
}
+/* Our two options */
+enum {
+ TRACE_FUNC_OPT_STACK = 0x1,
+ TRACE_FUNC_OPT_PSTORE = 0x2,
+};
+
+static struct tracer_flags func_flags;
+
static void
function_trace_call(unsigned long ip, unsigned long parent_ip)
{
@@ -97,6 +106,12 @@ function_trace_call(unsigned long ip, unsigned long parent_ip)
disabled = atomic_inc_return(&data->disabled);
if (likely(disabled == 1)) {
+ /*
+ * So far tracing doesn't support multiple buffers, so
+ * we make an explicit call for now.
+ */
+ if (unlikely(func_flags.val & TRACE_FUNC_OPT_PSTORE))
+ pstore_ftrace_call(ip, parent_ip);
pc = preempt_count();
trace_function(tr, ip, parent_ip, flags, pc);
}
@@ -158,15 +173,13 @@ static struct ftrace_ops trace_stack_ops __read_mostly =
.flags = FTRACE_OPS_FL_GLOBAL,
};
-/* Our two options */
-enum {
- TRACE_FUNC_OPT_STACK = 0x1,
-};
-
static struct tracer_opt func_opts[] = {
#ifdef CONFIG_STACKTRACE
{ TRACER_OPT(func_stack_trace, TRACE_FUNC_OPT_STACK) },
#endif
+#ifdef CONFIG_PSTORE_FTRACE
+ { TRACER_OPT(func_pstore, TRACE_FUNC_OPT_PSTORE) },
+#endif
{ } /* Always set a last empty entry */
};
@@ -218,6 +231,8 @@ static int func_set_flag(u32 old_flags, u32 bit, int set)
}
return 0;
+ } else if (bit == TRACE_FUNC_OPT_PSTORE) {
+ return 0;
}
return -EINVAL;