id summary reporter owner description type status priority component version resolution keywords cc blockedby blocking parents p4branch gitbranch freebsdpr duedate 37 Implement MAP_32BIT john john "{{{ On 14 Aug 2013, at 13:21, John Baldwin wrote: > On Wednesday, August 14, 2013 4:23:11 am David Chisnall wrote: >> On 13 Aug 2013, at 21:57, Jilles Tjoelker wrote: >> >>> Given that JIT is for performance and larger addresses increase code >>> size and register pressure, the mmap() flag is probably useful. >>> Alternatively, all the JITted code could be placed in one block and use >>> relative addressing. >> >> This would be a good thing to have in for 10.0, as the LLVM 3.4 JIT will >> require it unless someone wants to contribute support for the large code >> model... > > So you just need a flag to cap the virtual address at 2GB? Do you think we > need an arbitrary address flag for this, or is a hardcoded 2GB flag ok? > > Linux has a MAP_32BIT that does what you want I think. Yes, MAP_32BIT is used on Linux to solve this. David }}} " enhancement closed major kernel fixed vm