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authorUsama Arif <usama.arif@bytedance.com>2023-09-13 11:54:01 +0100
committerAndrew Morton <akpm@linux-foundation.org>2023-10-04 10:32:30 -0700
commitfde1c4ecf91640e5a95ec36b71ec2e8ec379ce40 (patch)
treeebbd7d77db3e2926ae632857ff6ee132e87c11da /mm/internal.h
parent77e6c43e137c130138c3fbadc847351a83c4befe (diff)
mm: hugetlb: skip initialization of gigantic tail struct pages if freed by HVO
The new boot flow when it comes to initialization of gigantic pages is as follows: - At boot time, for a gigantic page during __alloc_bootmem_hugepage, the region after the first struct page is marked as noinit. - This results in only the first struct page to be initialized in reserve_bootmem_region. As the tail struct pages are not initialized at this point, there can be a significant saving in boot time if HVO succeeds later on. - Later on in the boot, the head page is prepped and the first HUGETLB_VMEMMAP_RESERVE_SIZE / sizeof(struct page) - 1 tail struct pages are initialized. - HVO is attempted. If it is not successful, then the rest of the tail struct pages are initialized. If it is successful, no more tail struct pages need to be initialized saving significant boot time. The WARN_ON for increased ref count in gather_bootmem_prealloc was changed to a VM_BUG_ON. This is OK as there should be no speculative references this early in boot process. The VM_BUG_ON's are there just in case such code is introduced. [akpm@linux-foundation.org: make it nicer for 80 cols] Link: https://lkml.kernel.org/r/20230913105401.519709-5-usama.arif@bytedance.com Signed-off-by: Usama Arif <usama.arif@bytedance.com> Reviewed-by: Muchun Song <songmuchun@bytedance.com> Reviewed-by: Mike Kravetz <mike.kravetz@oracle.com> Cc: Fam Zheng <fam.zheng@bytedance.com> Cc: Mike Rapoport (IBM) <rppt@kernel.org> Cc: Punit Agrawal <punit.agrawal@bytedance.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm/internal.h')
-rw-r--r--mm/internal.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/mm/internal.h b/mm/internal.h
index a273f4d948d8..f7c963dfbdb3 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -1155,6 +1155,9 @@ struct vma_prepare {
struct vm_area_struct *remove2;
};
+void __meminit __init_single_page(struct page *page, unsigned long pfn,
+ unsigned long zone, int nid);
+
/* shrinker related functions */
unsigned long shrink_slab(gfp_t gfp_mask, int nid, struct mem_cgroup *memcg,
int priority);