On 2023/9/29 16:19, Mike Rapoport wrote:
On Thu, Sep 28, 2023 at 04:33:01PM +0800, Yajun Deng wrote:Subject: mm: pass page count and reserved to __init_single_pageWe add pass flags that tell __init_single_page() how to initialize page count and PG_Reserved, I think a better subject would be: mm: allow optional initialization of page count and PG_reserved flag
Okay.
When we init a single page, we need to mark that page reserved when it is reserved. And some pages need to reset page count, such as compound pages. Introduce enum init_page_flags, the caller will init page count and mark page reserved by passing INIT_PAGE_COUNT and INIT_PAGE_RESERVED.This does not really describe why the change is needed. How about __init_single_page() unconditionally resets page count which is unnecessary for reserved pages. To allow skipping page count initialization and marking a page reserved in one go add flags parameter to __init_single_page(). No functional changes.
Okay.
Signed-off-by: Yajun Deng <yajun.deng@xxxxxxxxx> --- v4: move the changes of __init_zone_device_page(). v3: Introduce enum init_page_flags. v2: Introduce INIT_PAGE_COUNT and INIT_PAGE_RESERVED. v1: https://lore.kernel.org/all/20230922070923.355656-1-yajun.deng@xxxxxxxxx/ --- mm/hugetlb.c | 2 +- mm/internal.h | 8 +++++++- mm/mm_init.c | 24 +++++++++++++----------- 3 files changed, 21 insertions(+), 13 deletions(-) diff --git a/mm/hugetlb.c b/mm/hugetlb.c index a82dc37669b0..bb9c334a8392 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -3196,7 +3196,7 @@ static void __init hugetlb_folio_init_tail_vmemmap(struct folio *folio, for (pfn = head_pfn + start_page_number; pfn < end_pfn; pfn++) { struct page *page = pfn_to_page(pfn);- __init_single_page(page, pfn, zone, nid);+ __init_single_page(page, pfn, zone, nid, INIT_PAGE_COUNT); prep_compound_tail((struct page *)folio, pfn - head_pfn); ret = page_ref_freeze(page, 1); VM_BUG_ON(!ret); diff --git a/mm/internal.h b/mm/internal.h index d7916f1e9e98..449891ad7fdb 100644 --- a/mm/internal.h +++ b/mm/internal.h @@ -1209,8 +1209,14 @@ struct vma_prepare { struct vm_area_struct *remove2; };+enum init_page_flags {enum page_init_flags please
Okay.
No, There is a #ifdef in front of it. If so, I need to add __SetPageReserved to another init_reserved_page().+ INIT_PAGE_COUNT = (1 << 0), + INIT_PAGE_RESERVED = (1 << 1), +}; + void __meminit __init_single_page(struct page *page, unsigned long pfn, - unsigned long zone, int nid); + unsigned long zone, int nid, + enum init_page_flags flags);/* shrinker related functions */unsigned long shrink_slab(gfp_t gfp_mask, int nid, struct mem_cgroup *memcg, diff --git a/mm/mm_init.c b/mm/mm_init.c index 06a72c223bce..9716c8a7ade9 100644 --- a/mm/mm_init.c +++ b/mm/mm_init.c @@ -557,11 +557,11 @@ static void __init find_zone_movable_pfns_for_nodes(void) }void __meminit __init_single_page(struct page *page, unsigned long pfn,- unsigned long zone, int nid) + unsigned long zone, int nid, + enum init_page_flags flags) { mm_zero_struct_page(page); set_page_links(page, zone, nid, pfn); - init_page_count(page); page_mapcount_reset(page); page_cpupid_reset_last(page); page_kasan_tag_reset(page); @@ -572,6 +572,10 @@ void __meminit __init_single_page(struct page *page, unsigned long pfn, if (!is_highmem_idx(zone)) set_page_address(page, __va(pfn << PAGE_SHIFT)); #endif + if (flags & INIT_PAGE_COUNT) + init_page_count(page); + if (flags & INIT_PAGE_RESERVED) + __SetPageReserved(page); }#ifdef CONFIG_NUMA@@ -714,7 +718,7 @@ static void __meminit init_reserved_page(unsigned long pfn, int nid) if (zone_spans_pfn(zone, pfn)) break; } - __init_single_page(pfn_to_page(pfn), pfn, zid, nid); + __init_single_page(pfn_to_page(pfn), pfn, zid, nid, INIT_PAGE_COUNT);There is __SetPageReserved call a few lines below, it can be folded here.
And there is an return before __init_single_page. I will change INIT_PAGE_COUNT to 0 in next patch.
} #else static inline void pgdat_set_deferred_range(pg_data_t *pgdat) {} @@ -821,8 +825,8 @@ static void __init init_unavailable_range(unsigned long spfn, pfn = pageblock_end_pfn(pfn) - 1; continue; } - __init_single_page(pfn_to_page(pfn), pfn, zone, node); - __SetPageReserved(pfn_to_page(pfn)); + __init_single_page(pfn_to_page(pfn), pfn, zone, node, + INIT_PAGE_COUNT | INIT_PAGE_RESERVED); pgcnt++; }@@ -884,7 +888,7 @@ void __meminit memmap_init_range(unsigned long size, int nid, unsigned long zone}page = pfn_to_page(pfn);- __init_single_page(page, pfn, zone, nid); + __init_single_page(page, pfn, zone, nid, INIT_PAGE_COUNT); if (context == MEMINIT_HOTPLUG) __SetPageReserved(page);@@ -967,9 +971,6 @@ static void __ref __init_zone_device_page(struct page *page, unsigned long pfn,unsigned long zone_idx, int nid, struct dev_pagemap *pgmap) { - - __init_single_page(page, pfn, zone_idx, nid); - /* * Mark page reserved as it will need to wait for onlining * phase for it to be fully associated with a zone. @@ -977,7 +978,8 @@ static void __ref __init_zone_device_page(struct page *page, unsigned long pfn, * We can use the non-atomic __set_bit operation for setting * the flag as we are still initializing the pages. */ - __SetPageReserved(page); + __init_single_page(page, pfn, zone_idx, nid, + INIT_PAGE_COUNT | INIT_PAGE_RESERVED);/** ZONE_DEVICE pages union ->lru with a ->pgmap back pointer @@ -2058,7 +2060,7 @@ static unsigned long __init deferred_init_pages(struct zone *zone, } else { page++; } - __init_single_page(page, pfn, zid, nid); + __init_single_page(page, pfn, zid, nid, INIT_PAGE_COUNT); nr_pages++; } return (nr_pages); -- 2.25.1
