From: Randy Dunlap <randy.dunlap@oracle.com>
Date: Tue, 28 Jun 2011 00:01:46 +0000 (-0700)
Subject: dtrace: add some dtrace static probes that are easy to trigger
X-Git-Tag: v4.1.12-92~313^2~184
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=e14c92e23c7620d93774fd9ebc2f4596d7772c3d;p=users%2Fjedix%2Flinux-maple.git

dtrace: add some dtrace static probes that are easy to trigger

See the static probes directory listing for a summary of
all dtrace static probes.

Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
---

diff --git a/drivers/tty/sysrq.c b/drivers/tty/sysrq.c
index 843f2cdc280b..8d659c381eaa 100644
--- a/drivers/tty/sysrq.c
+++ b/drivers/tty/sysrq.c
@@ -32,6 +32,7 @@
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/suspend.h>
+#include <linux/sdt.h>
 #include <linux/writeback.h>
 #include <linux/swap.h>
 #include <linux/spinlock.h>
@@ -527,6 +528,9 @@ void __handle_sysrq(int key, bool check_mask)
 	pr_info("SysRq : ");
 
         op_p = __sysrq_get_key_op(key);
+	DTRACE_PROBE3(__handle_sysrq,
+		int, key, int, check_mask,
+		int, orig_log_level);
         if (op_p) {
 		/*
 		 * Should we check for enabled operations (/proc/sysrq-trigger
diff --git a/kernel/module.c b/kernel/module.c
index cfc9e843a924..90dac4ee90ec 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -797,6 +797,10 @@ SYSCALL_DEFINE2(delete_module, const char __user *, name_user,
 	char name[MODULE_NAME_LEN];
 	int ret, forced = 0;
 
+	DTRACE_PROBE2(delete_module,
+		const char __user *, name_user,
+		unsigned int, flags);
+
 	if (!capable(CAP_SYS_MODULE) || modules_disabled)
 		return -EPERM;
 
@@ -3411,6 +3415,10 @@ SYSCALL_DEFINE3(init_module, void __user *, umod,
 	int err;
 	struct load_info info = { };
 
+	DTRACE_PROBE3(init_module,
+		void __user *, umod,
+		unsigned long, len, const char __user *, uargs);
+
 	err = may_init_module();
 	if (err)
 		return err;
diff --git a/kernel/signal.c b/kernel/signal.c
index d51c5ddd855c..5d366e7b1de2 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -37,6 +37,7 @@
 
 #define CREATE_TRACE_POINTS
 #include <trace/events/signal.h>
+#include <linux/sdt.h>
 
 #include <asm/param.h>
 #include <asm/uaccess.h>
@@ -2341,6 +2342,11 @@ relock:
 			if (print_fatal_signals)
 				print_fatal_signal(ksig->info.si_signo);
 			proc_coredump_connector(current);
+			DTRACE_PROBE4(get_signal_to_deliver,
+				int, ksig->info.si_signo,
+				struct pt_regs *, regs,
+				char *, current->comm,
+				int, task_pid_nr(current));
 			/*
 			 * If it was able to dump core, this kills all
 			 * other threads in the group and synchronizes with