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    SubjectRe: [PATCH v2][RFC] add MAP_UNLOCKED mmap flag
    On Tue, Oct 06, 2009 at 08:34:36PM +0200, Johannes Weiner wrote:
    > On Tue, Oct 06, 2009 at 07:02:18PM +0200, Gleb Natapov wrote:
    > > diff --git a/include/asm-generic/mman.h b/include/asm-generic/mman.h
    > > index 32c8bd6..59e0f29 100644
    > > --- a/include/asm-generic/mman.h
    > > +++ b/include/asm-generic/mman.h
    > > @@ -12,6 +12,7 @@
    > > #define MAP_NONBLOCK 0x10000 /* do not block on IO */
    > > #define MAP_STACK 0x20000 /* give out an address that is best suited for process/thread stacks */
    > > #define MAP_HUGETLB 0x40000 /* create a huge page mapping */
    > > +#define MAP_UNLOCKED 0x80000 /* force page unlocking */
    > >
    > > #define MCL_CURRENT 1 /* lock all current mappings */
    > > #define MCL_FUTURE 2 /* lock all future mappings */
    > > diff --git a/mm/mmap.c b/mm/mmap.c
    > > index 73f5e4b..7c2abdb 100644
    > > --- a/mm/mmap.c
    > > +++ b/mm/mmap.c
    > > @@ -985,6 +985,9 @@ unsigned long do_mmap_pgoff(struct file *file, unsigned long addr,
    > > if (!can_do_mlock())
    > > return -EPERM;
    > >
    > > + if (flags & MAP_UNLOKED)
    > > + vm_flags &= ~VM_LOCKED;
    >
    > That needs changing into MAP_UNLOCKED as well.
    >
    That's for editing patch manually :(

    > Should we do something special about (MAP_UNLOCKED | MAP_LOCKED)?
    It is simpler to just ignore it. What do you think?

    --
    Gleb.


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