linux-4.4.1/__split_huge_page()
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開始行:
*参照元 [#s3cb7d5c]
#backlinks
*説明 [#v668bda5]
-パス: [[linux-4.4.1/mm/huge_memory.c]]
-FIXME: これは何？
--説明
**引数 [#u8234761]
-struct page *page
--
--[[linux-4.4.1/page]]
-struct anon_vma *anon_vma
--
--[[linux-4.4.1/anon_vma]]
-struct list_head *list
--
--[[linux-4.4.1/list_head]]
**返り値 [#e5225d56]
-void
**参考 [#q2264ba2]
*実装 [#x4372d2b]
/* must be called with anon_vma->root->rwsem held */
static void __split_huge_page(struct page *page,
struct anon_vma *anon_vma,
struct list_head *list)
{
int mapcount, mapcount2;
pgoff_t pgoff = page->index << (PAGE_CACHE_SHIFT - PAGE...
struct anon_vma_chain *avc;
-
--[[linux-4.4.1/pgoff_t]]
--[[linux-4.4.1/anon_vma_chain]]
BUG_ON(!PageHead(page));
BUG_ON(PageTail(page));
-
--[[linux-4.4.1/BUG_ON()]]
--[[linux-4.4.1/PageHead()]]
--[[linux-4.4.1/PageTail()]]
mapcount = 0;
anon_vma_interval_tree_foreach(avc, &anon_vma->rb_root,...
struct vm_area_struct *vma = avc->vma;
unsigned long addr = vma_address(page, vma);
BUG_ON(is_vma_temporary_stack(vma));
mapcount += __split_huge_page_splitting(page, vma, add...
}
-
--[[linux-4.4.1/anon_vma_interval_tree_foreach()]]
--[[linux-4.4.1/vm_area_struct]]
--[[linux-4.4.1/vma_address()]]
--[[linux-4.4.1/BUG_ON()]]
--[[linux-4.4.1/is_vma_temporary_stack()]]
--[[linux-4.4.1/__split_huge_page_splitting()]]
/*
* It is critical that new vmas are added to the tail o...
* anon_vma list. This guarantes that if copy_huge_pmd(...
* and establishes a child pmd before
* __split_huge_page_splitting() freezes the parent pmd...
* we fail to prevent copy_huge_pmd() from running unti...
* whole __split_huge_page() is complete), we will stil...
* the newly established pmd of the child later during ...
* walk, to be able to set it as pmd_trans_splitting too.
*/
if (mapcount != page_mapcount(page)) {
pr_err("mapcount %d page_mapcount %d\n",
mapcount, page_mapcount(page));
BUG();
}
-
--[[linux-4.4.1/page_mapcount()]]
--[[linux-4.4.1/pr_err()]]
--[[linux-4.4.1/BUG()]]
__split_huge_page_refcount(page, list);
-
--[[linux-4.4.1/__split_huge_page_refcount()]]
mapcount2 = 0;
anon_vma_interval_tree_foreach(avc, &anon_vma->rb_root,...
struct vm_area_struct *vma = avc->vma;
unsigned long addr = vma_address(page, vma);
BUG_ON(is_vma_temporary_stack(vma));
mapcount2 += __split_huge_page_map(page, vma, addr);
}
-
--[[linux-4.4.1/anon_vma_interval_tree_foreach()]]
--[[linux-4.4.1/vm_area_struct]]
--[[linux-4.4.1/vma_address()]]
--[[linux-4.4.1/BUG_ON()]]
--[[linux-4.4.1/is_vma_temporary_stack()]]
--[[linux-4.4.1/__split_huge_page_map()]]
if (mapcount != mapcount2) {
pr_err("mapcount %d mapcount2 %d page_mapcount %d\n",
mapcount, mapcount2, page_mapcount(page));
BUG();
}
}
*コメント [#c827dafd]
終了行:
*参照元 [#s3cb7d5c]
#backlinks
*説明 [#v668bda5]
-パス: [[linux-4.4.1/mm/huge_memory.c]]
-FIXME: これは何？
--説明
**引数 [#u8234761]
-struct page *page
--
--[[linux-4.4.1/page]]
-struct anon_vma *anon_vma
--
--[[linux-4.4.1/anon_vma]]
-struct list_head *list
--
--[[linux-4.4.1/list_head]]
**返り値 [#e5225d56]
-void
**参考 [#q2264ba2]
*実装 [#x4372d2b]
/* must be called with anon_vma->root->rwsem held */
static void __split_huge_page(struct page *page,
struct anon_vma *anon_vma,
struct list_head *list)
{
int mapcount, mapcount2;
pgoff_t pgoff = page->index << (PAGE_CACHE_SHIFT - PAGE...
struct anon_vma_chain *avc;
-
--[[linux-4.4.1/pgoff_t]]
--[[linux-4.4.1/anon_vma_chain]]
BUG_ON(!PageHead(page));
BUG_ON(PageTail(page));
-
--[[linux-4.4.1/BUG_ON()]]
--[[linux-4.4.1/PageHead()]]
--[[linux-4.4.1/PageTail()]]
mapcount = 0;
anon_vma_interval_tree_foreach(avc, &anon_vma->rb_root,...
struct vm_area_struct *vma = avc->vma;
unsigned long addr = vma_address(page, vma);
BUG_ON(is_vma_temporary_stack(vma));
mapcount += __split_huge_page_splitting(page, vma, add...
}
-
--[[linux-4.4.1/anon_vma_interval_tree_foreach()]]
--[[linux-4.4.1/vm_area_struct]]
--[[linux-4.4.1/vma_address()]]
--[[linux-4.4.1/BUG_ON()]]
--[[linux-4.4.1/is_vma_temporary_stack()]]
--[[linux-4.4.1/__split_huge_page_splitting()]]
/*
* It is critical that new vmas are added to the tail o...
* anon_vma list. This guarantes that if copy_huge_pmd(...
* and establishes a child pmd before
* __split_huge_page_splitting() freezes the parent pmd...
* we fail to prevent copy_huge_pmd() from running unti...
* whole __split_huge_page() is complete), we will stil...
* the newly established pmd of the child later during ...
* walk, to be able to set it as pmd_trans_splitting too.
*/
if (mapcount != page_mapcount(page)) {
pr_err("mapcount %d page_mapcount %d\n",
mapcount, page_mapcount(page));
BUG();
}
-
--[[linux-4.4.1/page_mapcount()]]
--[[linux-4.4.1/pr_err()]]
--[[linux-4.4.1/BUG()]]
__split_huge_page_refcount(page, list);
-
--[[linux-4.4.1/__split_huge_page_refcount()]]
mapcount2 = 0;
anon_vma_interval_tree_foreach(avc, &anon_vma->rb_root,...
struct vm_area_struct *vma = avc->vma;
unsigned long addr = vma_address(page, vma);
BUG_ON(is_vma_temporary_stack(vma));
mapcount2 += __split_huge_page_map(page, vma, addr);
}
-
--[[linux-4.4.1/anon_vma_interval_tree_foreach()]]
--[[linux-4.4.1/vm_area_struct]]
--[[linux-4.4.1/vma_address()]]
--[[linux-4.4.1/BUG_ON()]]
--[[linux-4.4.1/is_vma_temporary_stack()]]
--[[linux-4.4.1/__split_huge_page_map()]]
if (mapcount != mapcount2) {
pr_err("mapcount %d mapcount2 %d page_mapcount %d\n",
mapcount, mapcount2, page_mapcount(page));
BUG();
}
}
*コメント [#c827dafd]
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