Hi Pete, > At OLS I talked to Anton Blanchard (he works on ppc6 with Paul > Mackerras), and he indicated an interest in making a kernel > running with an 8K software page size on top of 4K hardware > page size. I understand that the order-2 patch from 2.4.17 > level update reduced the urgency of this for s390x; please > tell me if this is correct.
Reduce the urgency yes, but it still isn't a complete fix. > Do we want something like this? The problem we were seeing with this approach is that it is user-space visible: mmap on 4K (but not 8K) boundary would now fail. This is in particular fatal for applications running in 31-bit emu mode (e.g. ELF sections are aligned to 4K) ... > If yes, what workload triggers allocation failures (for reproducible > testing)? I'm not aware of any small test case. Running very long batch jobs on a SAP R/3 app server under heavy load used to trigger the problem (before the order-2 patch). Bye, Ulrich -- Dr. Ulrich Weigand [EMAIL PROTECTED]
