Re: [PATCH 3/3] mm: hugetlb_vmemmap: cleanup CONFIG_HUGETLB_PAGE_FREE_VMEMMAP*

From: Muchun Song
Date: Wed Jun 01 2022 - 07:56:45 EST


On Wed, Jun 01, 2022 at 12:10:29PM +0200, David Hildenbrand wrote:
> On 01.06.22 11:54, Muchun Song wrote:
> > On Wed, Jun 01, 2022 at 11:32:37AM +0200, David Hildenbrand wrote:
> >> On 04.04.22 09:46, Muchun Song wrote:
> >>> The word of "free" is not expressive enough to express the feature of optimizing
> >>> vmemmap pages associated with each HugeTLB, rename this keywork to "optimeze".
> >>> In this patch , cheanup configs to make code more expressive.
> >>
> >> Nit: why not simply CONFIG_HUGETLB_OPTIMIZE_VMEMMAP if we're touching
> >> this already? At least I don't see value in the additional "PAGE" :)
> >>
> >
> > I thought it keep consistent with CONFIG_HUGETLB_PAGE. If you think
> > CONFIG_HUGETLB_OPTIMIZE_VMEMMAP is a better name, maybe we need to
> > another separate patch since this series is already on mm-stable branch.
>
> I see, makes sense then.
>
> >>>
> >>> Signed-off-by: Muchun Song <songmuchun@xxxxxxxxxxxxx>
> >>> ---
> >>> Documentation/admin-guide/kernel-parameters.txt | 4 ++--
> >>> Documentation/admin-guide/mm/hugetlbpage.rst | 2 +-
> >>> arch/arm64/Kconfig | 2 +-
> >>> arch/arm64/mm/flush.c | 2 +-
> >>> arch/x86/Kconfig | 2 +-
> >>> arch/x86/mm/init_64.c | 2 +-
> >>> fs/Kconfig | 16 ++++++++--------
> >>> include/linux/hugetlb.h | 2 +-
> >>> include/linux/mm.h | 2 +-
> >>> include/linux/page-flags.h | 6 +++---
> >>> mm/Makefile | 2 +-
> >>> mm/hugetlb_vmemmap.c | 4 ++--
> >>> mm/hugetlb_vmemmap.h | 4 ++--
> >>> mm/sparse-vmemmap.c | 4 ++--
> >>> 14 files changed, 27 insertions(+), 27 deletions(-)
> >>>
> >>> diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
> >>> index 56edbe3f458f..89a58ac49d5f 100644
> >>> --- a/Documentation/admin-guide/kernel-parameters.txt
> >>> +++ b/Documentation/admin-guide/kernel-parameters.txt
> >>> @@ -1660,7 +1660,7 @@
> >>> Format: size[KMG]
> >>>
> >>> hugetlb_free_vmemmap=
> >>
> >> We didn't change the parameter name in #2, correct?
> >>
> >
> > I think this is a interface to users. Is it correct to
> > change it?
>
> I guess so ... I was just wanted to confirm that this is still correct :)
>

Well, I think it is not correct to change it since it
could change behavior to users. :-)

Thanks.