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SubjectRe: [PATCH v3 7/7] mm/sparse.c: Use __get_free_pages() instead in populate_section_memmap()
On 03/10/20 at 03:56pm, Michal Hocko wrote:
> On Sat 07-03-20 16:42:29, Baoquan He wrote:
> > This removes the unnecessary goto, and simplify codes.
> >
> > Signed-off-by: Baoquan He <bhe@redhat.com>
> > Reviewed-by: Wei Yang <richardw.yang@linux.intel.com>
> > ---
> > mm/sparse.c | 16 ++++++----------
> > 1 file changed, 6 insertions(+), 10 deletions(-)
> >
> > diff --git a/mm/sparse.c b/mm/sparse.c
> > index fde651ab8741..266f7f5040fb 100644
> > --- a/mm/sparse.c
> > +++ b/mm/sparse.c
> > @@ -735,23 +735,19 @@ static void free_map_bootmem(struct page *memmap)
> > struct page * __meminit populate_section_memmap(unsigned long pfn,
> > unsigned long nr_pages, int nid, struct vmem_altmap *altmap)
> > {
> > - struct page *page, *ret;
> > + struct page *ret;
> > unsigned long memmap_size = sizeof(struct page) * PAGES_PER_SECTION;
> >
> > - page = alloc_pages(GFP_KERNEL|__GFP_NOWARN, get_order(memmap_size));
> > - if (page)
> > - goto got_map_page;
> > + ret = (void*)__get_free_pages(GFP_KERNEL|__GFP_NOWARN,
> > + get_order(memmap_size));
> > + if (ret)
> > + return ret;
> >
> > ret = vmalloc(memmap_size);
> > if (ret)
> > - goto got_map_ptr;
> > + return ret;
> >
> > return NULL;
> > -got_map_page:
> > - ret = (struct page *)pfn_to_kaddr(page_to_pfn(page));
> > -got_map_ptr:
> > -
> > - return ret;
> > }
>
> Boy this code is ugly. Is there any reason we cannot simply use
> kvmalloc_array(PAGES_PER_SECTION, sizeof(struct page), GFP_KERNEL | __GFP_NOWARN)
>
> And if we care about locality then go even one step further
> kvmalloc_node(PAGES_PER_SECTION * sizeof(struct page), GFP_KERNEL | __GFP_NOWARN, nid)

Yes, this looks better. I will use this to make a new version. Thanks.

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