On 01/27/2016 01:47 PM, Christian Borntraeger wrote: > On 01/27/2016 01:41 PM, Vlastimil Babka wrote: >> On 01/27/2016 01:59 AM, Joonsoo Kim wrote: >> >> I think it might be worth also to convert debug_pagealloc_enabled() to be >> based >> on static key, like I did for page_owner [1]. That should help make it >> possible >> to have virtually no overhead when compiling kernel with >> CONFIG_DEBUG_PAGEALLOC >> without enabling it boot-time. I assume it's one of the goals here? > > We could do something like that but dump_stack and setup of the initial > identity > mapping of the kernel as well as the initial page protection are not hot path > as far as I can tell. Any other places?
Well, mostly kernel_map_pages() which is used in page allocation hotpaths. >> >> [1] http://www.spinics.net/lists/linux-mm/msg100795.html > > > > -- > To unsubscribe, send a message with 'unsubscribe linux-mm' in > the body to majord...@kvack.org. For more info on Linux MM, > see: http://www.linux-mm.org/ . > Don't email: <a href=mailto:"d...@kvack.org";> em...@kvack.org </a> >
