On Tue 25-09-18 13:20:12, Alexander Duyck wrote: [...] > + vm_debug[=options] [KNL] Available with CONFIG_DEBUG_VM=y. > + May slow down system boot speed, especially when > + enabled on systems with a large amount of memory. > + All options are enabled by default, and this > + interface is meant to allow for selectively > + enabling or disabling specific virtual memory > + debugging features. > + > + Available options are: > + P Enable page structure init time poisoning > + - Disable all of the above options I agree with Dave that this is confusing as hell. So what does vm_debug (without any options means). I assume it's NOP and all debugging is enabled and that is the default. What if I want to disable _only_ the page struct poisoning. The weird lookcing `-' will disable all other options that we might gather in the future. Why cannot you simply go with [no]vm_page_poison[=on/off]? -- Michal Hocko SUSE Labs
