On 05.10.20 08:12, Michal Hocko wrote: > On Sat 03-10-20 00:44:09, Topi Miettinen wrote: >> On 2.10.2020 20.52, David Hildenbrand wrote: >>> On 02.10.20 19:19, Topi Miettinen wrote: >>>> The brk() system call allows to change data segment size (heap). This >>>> is mainly used by glibc for memory allocation, but it can use mmap() >>>> and that results in more randomized memory mappings since the heap is >>>> always located at fixed offset to program while mmap()ed memory is >>>> randomized. >>> >>> Want to take more Unix out of Linux? >>> >>> Honestly, why care about disabling? User space can happily use mmap() if >>> it prefers. >> >> brk() interface doesn't seem to be used much and glibc is happy to switch to >> mmap() if brk() fails, so why not allow disabling it optionally? If you >> don't care to disable, don't do it and this is even the default. > > I do not think we want to have config per syscall, do we? I do wonder if grouping would be a better option then (finding a proper level of abstraction ...). -- Thanks, David / dhildenb
