On Monday, June 20, 2016 4:43:30 PM CEST Andy Lutomirski wrote: > > On my laptop, this adds about 1.5µs of overhead to task creation, > which seems to be mainly caused by vmalloc inefficiently allocating > individual pages even when a higher-order page is available on the > freelist. Would it help to have a fixed virtual address for the stack instead and map the current stack to that during a task switch, similar to how we handle fixmap pages? That would of course trade the allocation overhead for a task switch overhead, which may be better or worse. It would also give "current" a constant address, which may give a small performance advantage but may also introduce a new attack vector unless we randomize it again. Arnd -- To unsubscribe from this list: send the line "unsubscribe linux-arch" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
