Function report

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:mm\memcontrol.c Create Date:2022-07-28 16:13:36
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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Annotation kernel can get tool activityDownload SCCTChinese

Name:mem_cgroup_move_charge_pte_range

Proto:static int mem_cgroup_move_charge_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end, struct mm_walk *walk)

Type:int

Parameter:

TypeParameterName
pmd_t *pmd
unsigned longaddr
unsigned longend
struct mm_walk *walk
5682  ret = 0
5683  vma = vma
5690  ptl = mmap_sem must be held on entry
5691  If ptl Then
5692  If precharge < HPAGE_PMD_NR Then
5693  spin_unlock(ptl)
5694  Return 0
5696  target_type = We don't consider PMD mapped swapping or file mapped pages because THP does* not support them for now.* Caller should make sure that pmd_trans_huge(pmd) is true.
5697  If target_type == MC_TARGET_PAGE Then
5698  page = page
5699  If Not solate_lru_page - tries to isolate a page from its LRU list*@page: page to isolate from its LRU list* Isolates a @page from an LRU list, clears PageLRU and adjusts the* vmstat statistic corresponding to whatever LRU list the page was on. Then
5707  Perform a free_page(), also freeing any swap cache associated with* this page if it is the last user of the page.
5708  Else if target_type == MC_TARGET_DEVICE Then
5709  page = page
5710  If Not mem_cgroup_move_account - move account of the page*@page: the page*@compound: charge the page as compound or small page*@from: mem_cgroup which the page is moved from.*@to: mem_cgroup which the page is moved to. @from != @to. Then
5715  Perform a free_page(), also freeing any swap cache associated with* this page if it is the last user of the page.
5717  spin_unlock(ptl)
5718  Return 0
5721  If This is a noop if Transparent Hugepage Support is not built into* the kernel Then Return 0
5723  retry :
5724  pte = pte_offset_map_lock(The address space we belong to. , pmd, addr, & ptl)
5725  When addr != end cycle
5726  ptent = * pte++
5727  bool device = false
5730  If Not precharge Then Break
5734  Case get_mctgt_type - get target type of moving charge*@vma: the vma the pte to be checked belongs*@addr: the address corresponding to the pte to be checked*@ptent: the pte to be checked*@target: the pointer the target page or swap ent will be stored(can be == MC_TARGET_DEVICE
5735  device = true
5737  Case get_mctgt_type - get target type of moving charge*@vma: the vma the pte to be checked belongs*@addr: the address corresponding to the pte to be checked*@ptent: the pte to be checked*@target: the pointer the target page or swap ent will be stored(can be == MC_TARGET_PAGE
5738  page = page
5745  If PageTransCompound returns true for both transparent huge pages* and hugetlbfs pages, so it should only be called when it's known* that hugetlbfs pages aren't involved. Then Go to put
5747  If Not device && solate_lru_page - tries to isolate a page from its LRU list*@page: page to isolate from its LRU list* Isolates a @page from an LRU list, clears PageLRU and adjusts the* vmstat statistic corresponding to whatever LRU list the page was on. Then Go to put
5749  If Not mem_cgroup_move_account - move account of the page*@page: the page*@compound: charge the page as compound or small page*@from: mem_cgroup which the page is moved from.*@to: mem_cgroup which the page is moved to. @from != @to. Then
5751  precharge--
5753  moved_charge++
5755  If Not device Then putback_lru_page - put previously isolated page onto appropriate LRU list*@page: page to be put back to appropriate lru list* Add previously isolated @page to appropriate LRU list.* Page may still be unevictable for other reasons.
5757  put :
5758  Perform a free_page(), also freeing any swap cache associated with* this page if it is the last user of the page.
5759  Break
5760  Case get_mctgt_type - get target type of moving charge*@vma: the vma the pte to be checked belongs*@addr: the address corresponding to the pte to be checked*@ptent: the pte to be checked*@target: the pointer the target page or swap ent will be stored(can be == MC_TARGET_SWAP
5761  ent = ent
5762  If Not mem_cgroup_move_swap_account - move swap charge and swap_cgroup's record Then
5763  precharge--
5765  moved_swap++
5767  Break
5768  Default
5769  Break
5772  pte_unmap_unlock(pte - 1, ptl)
5773  cond_resched()
5775  If addr != end Then
5782  ret = Handlers for move charge at task migration.
5783  If Not ret Then Go to retry
5787  Return ret