Hi folks ! While toying around with various MM callbacks, I found out that flush_tlb_mm() as a generic hook provided by the archs has been mostly obsoleted by the mmu_gather stuff.
(I'm not talking about archs internally wanting to implement it and use it as a tlb_flush(), I'm talking about possibly making that optional :-) I see two remaining users: - fs/proc/task_mmu.c, which I easily converted to use the mmu_gather (I'll send a patch if people agree it's worth doing) - kernel/fork.c uses it to flush the "old" mm. That's the "meat". I wonder if it's worth pursuing, that is converting copy_page_range to use an mmu_gather on the source instead of using flush_tlb_mm. It might allow some archs that can't just "flush all" easily but have to go through every PTE individually to improve things a bit on fork, and it allow them to remove the flush_tlb_mm() logic. There is one reason why it's not a trivial conversion though, is that copy_page_range() calls copy_hugetlb_page_range() for huge pages, and I'm not sure about mixing up the hugetlb stuff with the mmu_gather stuff, I need to do a bit more code auditing to figure out whether that's an ok thing to do. Nothing very urgent or important, it's just that one less hook seems like a good idea ;-) Cheers, Ben. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
