> > On Apr 23, 2005, at 1:35 PM, Joakim Tjernlund wrote: > > > Is it possible to handle the _PAGE_ACCESSED handling at pte creation > > in fault.c instead > > of doing it for every TLB miss? That should make the TLB Miss handler > > faster. > > No. As part of VM management to determine working sets, it's possible > to have > this flag change state but the page to remain valid.
OK, strange though. I would have expected this flag to stay untouched until the pte is invalidated. > The cost of > setting this properly > in the miss handler is minimal compared to the other stuff that we > should try > and streamline. Well, every instruction counts. I this case we would have saved 2 in ITLB Miss, 3 in DTLB Miss and a cache line write in both. Would be nice to do away with the kernel space test, but thats a lot harder. > > Thanks. > > -- Dan >
