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Date: Tue, 26 Sep 2023 10:33:40 +0800
From: Yajun Deng <yajun.deng@...ux.dev>
To: akpm@...ux-foundation.org, rppt@...nel.org
Cc: mike.kravetz@...cle.com, muchun.song@...ux.dev,
willy@...radead.org, david@...hat.com, linux-mm@...ck.org,
linux-kernel@...r.kernel.org, Yajun Deng <yajun.deng@...ux.dev>
Subject: [PATCH v3 1/2] mm: pass page count and reserved to __init_single_page
When we init a single page, we need to mark this page reserved if it
does. And some pages may not need to set page count, such as compound
pages.
Introduce enum init_page_flags, the caller init page count and mark page
reserved by passing INIT_PAGE_COUNT and INIT_PAGE_RESERVED.
Signed-off-by: Yajun Deng <yajun.deng@...ux.dev>
---
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@linux.dev/
---
mm/hugetlb.c | 2 +-
mm/internal.h | 8 +++++++-
mm/mm_init.c | 31 +++++++++++++++++--------------
3 files changed, 25 insertions(+), 16 deletions(-)
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index de220e3ff8be..cb282eadc729 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 {
+ 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..07fe7e489769 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);
}
#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);
@@ -965,11 +969,9 @@ static void __init memmap_init(void)
#ifdef CONFIG_ZONE_DEVICE
static void __ref __init_zone_device_page(struct page *page, unsigned long pfn,
unsigned long zone_idx, int nid,
- struct dev_pagemap *pgmap)
+ struct dev_pagemap *pgmap,
+ unsigned int flags)
{
-
- __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 +979,7 @@ 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, flags | INIT_PAGE_RESERVED);
/*
* ZONE_DEVICE pages union ->lru with a ->pgmap back pointer
@@ -1041,7 +1043,7 @@ static void __ref memmap_init_compound(struct page *head,
for (pfn = head_pfn + 1; pfn < end_pfn; pfn++) {
struct page *page = pfn_to_page(pfn);
- __init_zone_device_page(page, pfn, zone_idx, nid, pgmap);
+ __init_zone_device_page(page, pfn, zone_idx, nid, pgmap, 0);
prep_compound_tail(head, pfn - head_pfn);
set_page_count(page, 0);
@@ -1084,7 +1086,8 @@ void __ref memmap_init_zone_device(struct zone *zone,
for (pfn = start_pfn; pfn < end_pfn; pfn += pfns_per_compound) {
struct page *page = pfn_to_page(pfn);
- __init_zone_device_page(page, pfn, zone_idx, nid, pgmap);
+ __init_zone_device_page(page, pfn, zone_idx, nid, pgmap,
+ INIT_PAGE_COUNT);
if (pfns_per_compound == 1)
continue;
@@ -2058,7 +2061,7 @@ 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
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