* David A. Wheeler: >> The kernel should not apply hugepage optimizations to mappings created >> with MAP_DENYWRITE. > > Shouldn't that be MAP_EXECUTABLE, not MAP_DENYWRITE? > If you use MAP_DENYWRITE, > a program that mmaps in a large non-code dataset won't have hugepage > optimizations applied, which might be a significant performance regression.
It's just a bit that happens to be set by the glibc dynamic linker and not much else. The name doesn't matter at this point. > Also, the mmap man page: > https://man7.org/linux/man-pages/man2/mmap.2.html says that > MAP_EXECUTABLE and MAP_DENYWRITE are ignored. There's a risk that > some programs are taking that to heart & not using those flags even > when they should. If one of those flags *will* have an effect now, > then it'd be a good idea to document that :-). The effect of the flag is to get back the old behavior. 8-) It only makes backwards compatibility better. Thanks, Florian
