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Date: Fri, 2 Sep 2022 10:20:49 +0200
From: David Hildenbrand <david@...hat.com>
To: Kefeng Wang <wangkefeng.wang@...wei.com>,
Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org
Cc: Mike Rapoport <rppt@...nel.org>,
Oscar Salvador <osalvador@...e.de>,
linux-kernel@...r.kernel.org, Vlastimil Babka <vbabka@...e.cz>
Subject: Re: [PATCH 1/2] mm: reuse pageblock_start/end_pfn() macro
On 02.09.22 08:47, Kefeng Wang wrote:
> Move pageblock_start_pfn/pageblock_end_pfn() into pageblock-flags.h,
> then they could be used somewhere else, not only in compaction.
>
> Signed-off-by: Kefeng Wang <wangkefeng.wang@...wei.com>
> ---
> include/linux/pageblock-flags.h | 2 ++
> mm/compaction.c | 2 --
> mm/memblock.c | 2 +-
> mm/page_alloc.c | 13 ++++++-------
> mm/page_isolation.c | 2 +-
> mm/page_owner.c | 4 ++--
> 6 files changed, 12 insertions(+), 13 deletions(-)
>
> diff --git a/include/linux/pageblock-flags.h b/include/linux/pageblock-flags.h
> index 83c7248053a1..ef2e17e312ae 100644
> --- a/include/linux/pageblock-flags.h
> +++ b/include/linux/pageblock-flags.h
> @@ -53,6 +53,8 @@ extern unsigned int pageblock_order;
> #endif /* CONFIG_HUGETLB_PAGE */
>
> #define pageblock_nr_pages (1UL << pageblock_order)
> +#define pageblock_start_pfn(pfn) round_down(pfn, pageblock_nr_pages)
> +#define pageblock_end_pfn(pfn) ALIGN((pfn + 1), pageblock_nr_pages)
>
I'd naturally have paired ALIGN with ALIGN_DOWN -- or round_up with round_down.
(You're replacing one instance where ALIGN_DOWN was used at least.)
But maybe there is an obvious reason that I am missing :)
> /* Forward declaration */
> struct page;
> diff --git a/mm/compaction.c b/mm/compaction.c
> index f72907c7cfef..65bef5f78897 100644
> --- a/mm/compaction.c
> +++ b/mm/compaction.c
> @@ -52,8 +52,6 @@ static inline void count_compact_events(enum vm_event_item item, long delta)
>
> #define block_start_pfn(pfn, order) round_down(pfn, 1UL << (order))
> #define block_end_pfn(pfn, order) ALIGN((pfn) + 1, 1UL << (order))
> -#define pageblock_start_pfn(pfn) block_start_pfn(pfn, pageblock_order)
> -#define pageblock_end_pfn(pfn) block_end_pfn(pfn, pageblock_order)
>
> /*
> * Page order with-respect-to which proactive compaction
> diff --git a/mm/memblock.c b/mm/memblock.c
> index b5d3026979fc..46fe7575f03c 100644
> --- a/mm/memblock.c
> +++ b/mm/memblock.c
> @@ -2000,7 +2000,7 @@ static void __init free_unused_memmap(void)
> * presume that there are no holes in the memory map inside
> * a pageblock
> */
> - start = round_down(start, pageblock_nr_pages);
> + start = pageblock_start_pfn(start);
>
> /*
> * If we had a previous bank, and there is a space
> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> index 36b20215a3be..93339cc61f92 100644
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -544,7 +544,7 @@ static inline int pfn_to_bitidx(const struct page *page, unsigned long pfn)
> #ifdef CONFIG_SPARSEMEM
> pfn &= (PAGES_PER_SECTION-1);
> #else
> - pfn = pfn - round_down(page_zone(page)->zone_start_pfn, pageblock_nr_pages);
> + pfn = pfn - pageblock_start_pfn(page_zone(page)->zone_start_pfn);
> #endif /* CONFIG_SPARSEMEM */
> return (pfn >> pageblock_order) * NR_PAGEBLOCK_BITS;
> }
> @@ -1857,7 +1857,7 @@ void set_zone_contiguous(struct zone *zone)
> unsigned long block_start_pfn = zone->zone_start_pfn;
> unsigned long block_end_pfn;
>
> - block_end_pfn = ALIGN(block_start_pfn + 1, pageblock_nr_pages);
> + block_end_pfn = pageblock_end_pfn(block_start_pfn);
> for (; block_start_pfn < zone_end_pfn(zone);
> block_start_pfn = block_end_pfn,
> block_end_pfn += pageblock_nr_pages) {
> @@ -2653,8 +2653,8 @@ int move_freepages_block(struct zone *zone, struct page *page,
> *num_movable = 0;
>
> pfn = page_to_pfn(page);
> - start_pfn = pfn & ~(pageblock_nr_pages - 1);
> - end_pfn = start_pfn + pageblock_nr_pages - 1;
> + start_pfn = pageblock_start_pfn(pfn);
> + end_pfn = pageblock_end_pfn(pfn) - 1;
>
> /* Do not cross zone boundaries */
> if (!zone_spans_pfn(zone, start_pfn))
> @@ -6939,9 +6939,8 @@ static void __init init_unavailable_range(unsigned long spfn,
> u64 pgcnt = 0;
>
> for (pfn = spfn; pfn < epfn; pfn++) {
> - if (!pfn_valid(ALIGN_DOWN(pfn, pageblock_nr_pages))) {
> - pfn = ALIGN_DOWN(pfn, pageblock_nr_pages)
> - + pageblock_nr_pages - 1;
> + if (!pfn_valid(pageblock_start_pfn(pfn))) {
> + pfn = pageblock_end_pfn(pfn) - 1;
> continue;
> }
> __init_single_page(pfn_to_page(pfn), pfn, zone, node);
> diff --git a/mm/page_isolation.c b/mm/page_isolation.c
> index 9d73dc38e3d7..f2df4ad53cd6 100644
> --- a/mm/page_isolation.c
> +++ b/mm/page_isolation.c
> @@ -172,7 +172,7 @@ static int set_migratetype_isolate(struct page *page, int migratetype, int isol_
> * to avoid redundant checks.
> */
> check_unmovable_start = max(page_to_pfn(page), start_pfn);
> - check_unmovable_end = min(ALIGN(page_to_pfn(page) + 1, pageblock_nr_pages),
> + check_unmovable_end = min(pageblock_end_pfn(page_to_pfn(page)),
> end_pfn);
>
There are some more cases that might need care as well:
mm/memblock.c: prev_end = ALIGN(end, pageblock_nr_pages);
mm/memblock.c: prev_end = ALIGN(end, pageblock_nr_pages);
mm/page_isolation.c: VM_BUG_ON(ALIGN_DOWN(start_pfn, pageblock_nr_pages) !=
mm/page_isolation.c: ALIGN_DOWN(end_pfn - 1, pageblock_nr_pages));
mm/page_isolation.c: unsigned long isolate_start = ALIGN_DOWN(start_pfn, pageblock_nr_pages);
mm/page_isolation.c: unsigned long isolate_end = ALIGN(end_pfn, pageblock_nr_pages);
mm/page_isolation.c: unsigned long isolate_start = ALIGN_DOWN(start_pfn, pageblock_nr_pages);
mm/page_isolation.c: unsigned long isolate_end = ALIGN(end_pfn, pageblock_nr_pages);
--
Thanks,
David / dhildenb
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