On Thu, Jan 05, 2017 at 11:13:57AM -0800, Dave Hansen wrote: > On 12/26/2016 05:54 PM, Kirill A. Shutemov wrote: > > MM would use min(RLIMIT_VADDR, TASK_SIZE) as upper limit of virtual > > address available to map by userspace. > > What happens to existing mappings above the limit when this upper limit > is dropped?
Nothing: we only prevent creating new mappings. All existing are not affected. The semantics here the same as with other resource limits. > Similarly, why do we do with an application running with something > incompatible with the larger address space that tries to raise the > limit? Say, legacy MPX. It has to know what it does. Yes, it can change limit to the point where application is unusable. But you can to the same with other limits. -- Kirill A. Shutemov
