On Thu, Aug 29, 2024 at 09:19:13AM GMT, Michal Hocko wrote: > GFP_NOWAIT is explicitly documented as unsupported > (__vmalloc_node_range_noprof). vmalloc internals are using > vmap_purge_lock and blocking notifiers (vmap_notify_list) in rare cases > so PF_MEMALLOC_NORECLAIM is not really sufficient to provide NOWAIT > semantic (this is really not just about page tables allocations). There > might be other places that require blocking - I do not claim to be an > expert on the vmalloc allocator. Sure, but those are easily fixed, if necessary. We'd also want to be explicit on whether NORECLAIM needs to be NOWAIT or just NORECLAIM - those are slightly different things. As long as it's NORECLAIM that should be fine - it's really only an issue if we need to map GFP_NOWAIT to PF_MEMALLOC_*. > It seems that this discussion is not going to be really productive so I > will leave you here. I think you'll find these discussions become much more productive when you're able to stick to the technical, and when you yourself are able to listen to counterarguments. I remind you that we hash things out here on the list; we don't resort to things like "this has been decided" or "the mm community says"; you need to be properly justifying what you want to do here. And if people aren't listening to your arguments, that should be a hint to you that maybe you aren't making good ones.
