On Wed, Aug 09, 2017 at 06:31:28PM +0800, Yafang Shao wrote: > Sometimes we want to get tasks in TASK_RUNNING sepcifically, > instead of dump all tasks. > > For example, when the loadavg are high, we want to dump > tasks in TASK_RUNNING and TASK_UNINTERRUPTIBLE, which contribute > to system load. But mostly there're lots of tasks in Sleep state, > which occupies almost all of the kernel log buffer, even overflows > it, that causes the useful messages get lost. Although we can > enlarge the kernel log buffer, but that's not a good idea.
That's what you have serial consoles for... > +static void sysrq_handle_showstate_load(int key) > { > + show_state_filter(TASK_UNINTERRUPTIBLE << 1 | (TASK_RUNNING | 0x1)); > } How is that not unreadable gunk? > @@ -477,7 +478,7 @@ static void sysrq_handle_unrt(int key) > &sysrq_mountro_op, /* u */ > /* v: May be registered for frame buffer console restore */ > NULL, /* v */ > - &sysrq_showstate_blocked_op, /* w */ > + &sysrq_showstate_load_op, /* w */ > /* x: May be registered on mips for TLB dump */ > /* x: May be registered on ppc/powerpc for xmon */ > /* x: May be registered on sparc64 for global PMU dump */ So I'm really not convinced this is useful. The blocked thing is very useful if you're trying to debug a deadlock. Now you get endless clutter with runnable tasks. High load-avg as such isn't a problem. Why do you care?