On 07/04/21 14:26, Peter Zijlstra wrote: > On Wed, Apr 07, 2021 at 11:46:43AM +0100, Valentin Schneider wrote: >> I can't find the threads in a hurry, but ISTR justifications for keeping >> this around were: >> - Most distros have CONFIG_SCHED_DEBUG=y because knobs and ponies >> - Topology debug prints are "too verbose" > > ^^ that mostly. > >> - NUMA distance matrix processing gets slower >> >> If we make it so distros stop / don't need to select CONFIG_SCHED_DEBUG, > > We're not there yet, I think :-( >
Yeah, I know, a man can dream... At least now I can make use of CMDLINE_EXTEND on arm64. >> then I don't think the above really stands anymore (also, sched_init_numa() >> now has the same complexity regardless of sched_debug), and we could keep >> everything under CONFIG_SCHED_DEBUG. > > But yes, the reason this knob exists is ebcause I too frequently forget > to add the boot time knob, so I added this one to enable it at runtime > and then I get topology prints when I hotplug cycle a cpu.
