Fail if debugfs support is missing in the kernel:
open("/sys/kernel/debug/tracing/events/sched/sched_switch/id",
O_RDONLY|O_LARGEFILE) = -1 ENOENT (No such file or directory)
open("/sys/kernel/debug/tracing/events/sched/sched_wakeup/id",
O_RDONLY|O_LARGEFILE) = -1 ENOENT (No such file or directory)
open("/sys/kernel/debug/tracing/events/irq/irq_handler_entry/id",
O_RDONLY|O_LARGEFILE) = -1 ENOENT (No such file or directory)
open("/sys/kernel/debug/tracing/events/irq/irq_handler_exit/id",
O_RDONLY|O_LARGEFILE) = -1 ENOENT (No such file or directory)
open("/sys/kernel/debug/tracing/events/irq/softirq_entry/id",
O_RDONLY|O_LARGEFILE) = -1 ENOENT (No such file or directory)
open("/sys/kernel/debug/tracing/events/irq/softirq_exit/id",
O_RDONLY|O_LARGEFILE) = -1 ENOENT (No such file or directory)
open("/sys/kernel/debug/tracing/events/timer/timer_expire_entry/id",
O_RDONLY|O_LARGEFILE) = -1 ENOENT (No such file or directory)
open("/sys/kernel/debug/tracing/events/timer/timer_expire_exit/id",
O_RDONLY|O_LARGEFILE) = -1 ENOENT (No such file or directory)
open("/sys/kernel/debug/tracing/events/timer/hrtimer_expire_entry/id",
O_RDONLY|O_LARGEFILE) = -1 ENOENT (No such file or directory)
open("/sys/kernel/debug/tracing/events/timer/hrtimer_expire_exit/id",
O_RDONLY|O_LARGEFILE) = -1 ENOENT (No such file or directory)
open("/sys/kernel/debug/tracing/events/power/power_start/id",
O_RDONLY|O_LARGEFILE) = -1 ENOENT (No such file or directory)
open("/sys/kernel/debug/tracing/events/power/power_end/id",
O_RDONLY|O_LARGEFILE) = -1 ENOENT (No such file or directory)
open("/sys/kernel/debug/tracing/events/workqueue/workqueue_execute_start/id",
O_RDONLY|O_LARGEFILE) = -1 ENOENT (No such file or directory)
open("/sys/kernel/debug/tracing/events/workqueue/workqueue_execute_end/id",
O_RDONLY|O_LARGEFILE) = -1 ENOENT (No such file or directory)
open("/sys/kernel/debug/tracing/events/i915/i915_gem_ring_dispatch/id",
O_RDONLY|O_LARGEFILE) = -1 ENOENT (No such file or directory)
open("/sys/kernel/debug/tracing/events/i915/i915_gem_request_submit/id",
O_RDONLY|O_LARGEFILE) = -1 ENOENT (No such file or directory)
open("/sys/kernel/debug/tracing/events/writeback/writeback_inode_dirty/id",
O_RDONLY|O_LARGEFILE) = -1 ENOENT (No such file or directory)
diff --git a/main.cpp b/main.cpp
index 59be1fe..511f991 100644
--- a/main.cpp
+++ b/main.cpp
@@ -279,6 +279,11 @@ int main(int argc, char **argv)
} else {
ret = system("mount -t debugfs debugfs /sys/kernel/debug
> /dev/null 2>&1");
}
+ if (ret != 0) {
+ printf(_("Failed to mount debugfs!\n"));
+ printf(_("exiting...\n"));
+ exit(EXIT_FAILURE);
+ }
srand(time(NULL));
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