函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:mm\madvise.c Create Date:2022-07-27 16:42:31
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：madvise_cold_or_pageout_pte_range

函数原型：static int madvise_cold_or_pageout_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end, struct mm_walk *walk)

返回类型：int

参数：

类型参数名称
pmd_t *pmd
unsigned longaddr
unsigned longend
struct mm_walk *walk
304  private等于private
305  tlb等于tlb
306  pageout等于pageout
307  mm等于mm
308  vma等于vma
311  struct page * page = NULL
312  LIST_HEAD(page_list)
314  如果fatal_signal_pending(当前进程)则返回:负EINTR
318  如果pmd_trans_huge( * pmd)则
320  next等于pmd_addr_end(addr, end)
322  tlb_change_page_size(tlb, HPAGE_PMD_SIZE)
323  ptl等于mmap_sem must be held on entry
324  如果非ptl则返回:0
327  orig_pmd等于pmd
328  如果is_huge_zero_pmd(orig_pmd)则转到:huge_unlock
331  如果此条件成立可能性小(为编译器优化)(!pmd_present(orig_pmd))则
332  VM_BUG_ON(thp_migration_supported() && !is_pmd_migration_entry(orig_pmd))
334  转到:huge_unlock
337  page等于Currently stuck as a macro due to indirect forward reference to* linux/mmzone.h's __section_mem_map_addr() definition:(orig_pmd)
338  如果next减addr不等于HPAGE_PMD_SIZE则
341  如果page_mapcount(page)不等于1则转到:huge_unlock
344  get_page(page)
345  自旋锁解锁
346  lock_page may only be called if we have the page's inode pinned.
347  err等于split_huge_page(page)
348  lock_page - unlock a locked page*@page: the page* Unlocks the page and wakes up sleepers in ___wait_on_page_locked().* Also wakes sleepers in wait_on_page_writeback() because the wakeup* mechanism between PageLocked pages and PageWriteback pages is shared.
349  put_page(page)
350  如果非err则转到:regular_page
352  返回:0
355  如果pmd_young(orig_pmd)则
356  pmdp_invalidate(vma, addr, pmd)
357  orig_pmd等于pmd_mkold(orig_pmd)
359  set_pmd_at(mm, addr, pmd, orig_pmd)
360  tlb_remove_pmd_tlb_entry(tlb, pmd, addr)
363  ClearPageReferenced(page)
364  test_and_clear_page_young(page)
365  如果pageout则
366  如果非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.则
372  否则deactivate_page - deactivate a page*@page: page to deactivate* deactivate_page() moves @page to the inactive list if @page was on the active* list and was not an unevictable page. This is done to accelerate the reclaim* of @page.
374  huge_unlock :
375  自旋锁解锁
376  如果pageout则reclaim_pages( & page_list)
378  返回:0
381  如果This is a noop if Transparent Hugepage Support is not built into* the kernel则返回:0
383  regular_page :
385  tlb_change_page_size(tlb, PAGE_SIZE)
386  orig_pte等于pte等于pte_offset_map_lock(The address space we belong to. , pmd, addr, & ptl)
387  flush_tlb_batched_pending(mm)
388  A facility to provide lazy MMU batching()
389  以addr小于end循环
390  ptent等于pte
392  如果pte_none(ptent)则继续下一循环
395  如果非pte_present(ptent)则继续下一循环
398  page等于vm_normal_page -- This function gets the "struct page" associated with a pte.* "Special" mappings do not wish to be associated with a "struct page" (either* it doesn't exist, or it exists but they don't want to touch it). In this
399  如果非page则继续下一循环
406  如果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.则
407  如果page_mapcount(page)不等于1则退出
409  get_page(page)
410  如果非Return true if the page was successfully locked则
411  put_page(page)
412  退出
414  pte_unmap_unlock(orig_pte, ptl)
415  如果split_huge_page(page)则
421  lock_page - unlock a locked page*@page: the page* Unlocks the page and wakes up sleepers in ___wait_on_page_locked().* Also wakes sleepers in wait_on_page_writeback() because the wakeup* mechanism between PageLocked pages and PageWriteback pages is shared.
422  put_page(page)
423  pte等于pte_offset_map_lock(mm, pmd, addr, & ptl)
424  pte自减
425  addr减等于PAGE_SIZE
426  继续下一循环
429  VM_BUG_ON_PAGE(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., page)
431  如果pte_young(ptent)则
432  ptent等于ptep_get_and_clear_full(mm, addr, pte, we are in the middle of an operation to clear* a full mm and can make some optimizations)
434  ptent等于pte_mkold(ptent)
435  set_pte_at(mm, addr, pte, ptent)
436  lb_remove_tlb_entry - remember a pte unmapping for later tlb invalidation.* Record the fact that pte's were really unmapped by updating the range,* so we can later optimise away the tlb invalidate. This helps when(tlb, pte, addr)
445  ClearPageReferenced(page)
446  test_and_clear_page_young(page)
447  如果pageout则
448  如果非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.则
454  否则deactivate_page - deactivate a page*@page: page to deactivate* deactivate_page() moves @page to the inactive list if @page was on the active* list and was not an unevictable page. This is done to accelerate the reclaim* of @page.
458  arch_leave_lazy_mmu_mode()
459  pte_unmap_unlock(orig_pte, ptl)
460  如果pageout则reclaim_pages( & page_list)
462  cond_resched()
464  返回:0