Hi, I tested my ftrace-related patches and enabled also the startup test:
CONFIG_FTRACE_SELFTEST=y CONFIG_FTRACE_STARTUP_TEST=y On today's kernel/git/tip/tip.git, the boot "freezed" for 1 minute when doing "Testing event system syscalls". A bisect pointed finger to the commit d562aff93bfb530b099 (tracing: Add support for SOFT_DISABLE to syscall events). It seems that the culprit are the "synchronize_sched" calls added to "unreg_event_syscall_enter" and "unreg_event_syscall_exit" functions. They are called 2312 times during the boot here and are responsible for the delay. I wonder if it might cause slowdown also at runtime. I am going to look deeper into the code and eventually come up with a solution. But it might take some time. I am still newbie in the kernel development. Any hints or tips are welcome ;-) Best Regards, Petr -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
