On 10/1/19 1:49 AM, Qian Cai wrote: > > >> On Sep 30, 2019, at 5:43 PM, Vlastimil Babka <vbabka@xxxxxxx> wrote: >> >> Well, my use case is shipping production kernels with CONFIG_PAGE_OWNER >> and CONFIG_DEBUG_PAGEALLOC enabled, and instructing users to boot-time >> enable only for troubleshooting a crash or memory leak, without a need >> to install a debug kernel. Things like static keys and page_ext >> allocations makes this possible without CPU and memory overhead when not >> boot-time enabled. I don't know too much about KASAN internals, but I >> assume it's not possible to use it that way on production kernels yet? > > In that case, why can’t users just simply enable page_owner=on and debug_pagealloc=on for troubleshooting? The later makes the kernel slower, but I am not sure if it is worth optimization by adding a new parameter. There have already been quite a few MM-related kernel parameters that could tidy up a bit in the future. They can do that and it was intention, yes. The extra parameter was requested by Kirill, so I'll defer the answer to him :)
