On Mon, Jan 09, 2006 at 01:19:46PM +0530, Sathesh Babu Edara wrote: > We have ported linux-2.4.18 and linux-2-6.12 kernel (mips.org)onto MIPS > processor (CPU type lx4189). > > We observed that on 2.4 kernel,ll and sc instruction exception handlers > hitting very often. > Where as on linux-2.6.12 this is not happening. > Can anybody have idea why this instructions are hitting on 2.4.18 kernel and > not on 2-6.12 kernel. Only ll/sc instructions in application software can be emulated, so it would seem your application is behaving different on 2.4 and 2.6 kernels. > What is the significance of these instructions?. All sorts of atomic operations. I suggest you read up on them in See MIPS Run or short of that in the MIPS32/64 specification. Ralf
