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    SubjectRe: [PATCH 00/16] mm: prepare for converting vm->vm_flags to 64-bit
    On Wed, Mar 21, 2012 at 05:16:06PM +0400, Konstantin Khlebnikov wrote:
    > Minchan Kim wrote:
    > >Hi Konstantin,
    > >
    > >It seems to be nice clean up to me and you are a volunteer we have been wanted
    > >for a long time. Thanks!
    > >I am one of people who really want to expand vm_flags to 64 bit but when KOSAKI
    > >tried it, Linus said his concerning, I guess you already saw that.
    > >
    > >He want to tidy vm_flags's usage up rather than expanding it.
    > >Without the discussion about that, just expanding vm_flags would make us use
    > >it up easily so that we might need more space.
    > Strictly speaking, my pachset does not expands vm_flags, it just prepares to this.
    > Anyway vm_flags_t looks better than hard-coded "unsigned long" and messy type-casts around it.


    > >
    > >Readahead flags are good candidate to move into another space and arch-specific flags, I guess.
    > >Another candidate I think of is THP flag. It's just for only anonymous vma now
    > >(But I am not sure we have a plan to support it for file-backed pages in future)
    > >so we can move it to anon_vma or somewhere.
    > >I think other guys might find more somethings
    > >
    > >The point is that at least, we have to discuss about clean up current vm_flags's
    > >use cases before expanding it unconditionally.
    > Seems like we can easily remove VM_EXECUTABLE
    > (count in mm->num_exe_file_vmas amount of vmas with vma->vm_file == mm->exe_file
    > instead of vmas with VM_EXECUTABLE bit)
    > And probably VM_CAN_NONLINEAR...

    I think we can also unify VM_MAPPED_COPY(nommu) and VM_SAO(powerpc) with one VM_ARCH_1
    Okay. After this series is merged, let's try to remove flags we can do. Then, other guys
    might suggest another ideas.


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