Hi, > > 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.
... > 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) ... That makes life difficult. ppc32 aligns sections to 64KB and Im hoping we can fix any programs that rely on 4KB aligned mmaps, they should be using getpagesize(). > 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). What is the order-2 patch? Anton
