On Mon, Dec 02, 2013 at 03:01:07PM -0800, Andrew Morton wrote:
> On Thu, 28 Nov 2013 16:48:43 +0900 Joonsoo Kim <iamjoonsoo.kim@xxxxxxx> wrote:
>
> > Now, we have an infrastructure in rmap_walk() to handle difference
> > from variants of rmap traversing functions.
> >
> > So, just use it in try_to_unmap().
> >
> > In this patch, I change following things.
> >
> > 1. enable rmap_walk() if !CONFIG_MIGRATION.
> > 2. mechanical change to use rmap_walk() in try_to_unmap().
> >
> > ...
> >
> > --- a/include/linux/rmap.h
> > +++ b/include/linux/rmap.h
> > @@ -190,7 +190,7 @@ int page_referenced_one(struct page *, struct vm_area_struct *,
> >
> > int try_to_unmap(struct page *, enum ttu_flags flags);
> > int try_to_unmap_one(struct page *, struct vm_area_struct *,
> > - unsigned long address, enum ttu_flags flags);
> > + unsigned long address, void *arg);
>
> This change is ugly and unchangelogged.
>
> Also, "enum ttu_flags flags" was nice and meaningful, but "void *arg"
> conveys far less information. A suitable way to address this
> shortcoming is to document `arg' at the try_to_unmap_one() definition
> site. try_to_unmap_one() doesn't actually have any documentation at
> this stage - let's please fix that?
Okay. I will add some comments.
> >
> > ...
> >
> > @@ -1509,6 +1510,11 @@ bool is_vma_temporary_stack(struct vm_area_struct *vma)
> > return false;
> > }
> >
> > +static int skip_vma_temporary_stack(struct vm_area_struct *vma, void *arg)
> > +{
> > + return (int)is_vma_temporary_stack(vma);
> > +}
>
> The (int) cast is unneeded - the compiler will turn a bool into an int.
>
> Should this function (and rmap_walk_control.skip()) really be returning
> a bool?
Okay. Will do.
>
> The name of this function is poor: "skip_foo" implies that the function
> will skip over a foo. But that isn't what this function does. Please
> choose something which accurately reflects the function's behavior.
Okay.
Thanks.
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