函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:mm\memcontrol.c Create Date:2022-07-27 17:48:40
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：mem_cgroup_try_charge - try charging a page*@page: page to charge*@mm: mm context of the victim*@gfp_mask: reclaim mode*@memcgp: charged memcg return*@compound: charge the page as compound or small page* Try to charge @page to the memcg that @mm belongs

函数原型：int mem_cgroup_try_charge(struct page *page, struct mm_struct *mm, gfp_t gfp_mask, struct mem_cgroup **memcgp, bool compound)

返回类型：int

参数：

类型参数名称
struct page *page
struct mm_struct *mm
gfp_tgfp_mask
struct mem_cgroup **memcgp
boolcompound
6335  struct mem_cgroup * memcg = NULL
6336  nr_pages等于如果compound则hpage_nr_pages(page)否则1
6337  ret等于0
6339  如果mem_cgroup_disabled()则转到:out
6342  如果PageSwapCache(page)则
6350  VM_BUG_ON_PAGE(!PageLocked(page), page)
6351  如果mem_cgroup则转到:out
6354  如果Whether the swap controller is active 则
6355  swp_entry_t ent = {val = page_private(page), }
6356  id等于lookup_swap_cgroup_id(ent)
6358  _read_lock() - mark the beginning of an RCU read-side critical section* When synchronize_rcu() is invoked on one CPU while other CPUs* are within RCU read-side critical sections, then the* synchronize_rcu() is guaranteed to block until after all the other
6359  memcg等于mem_cgroup_from_id - look up a memcg from a memcg id*@id: the memcg id to look up* Caller must hold rcu_read_lock().
6360  如果memcg且非ss_tryget_online - try to obtain a reference on the specified css if online*@css: target css* Obtain a reference on @css if it's online则memcg = NULL
6362  _read_unlock() - marks the end of an RCU read-side critical section.* In most situations, rcu_read_unlock() is immune from deadlock.* However, in kernels built with CONFIG_RCU_BOOST, rcu_read_unlock()
6366  如果非memcg则memcg等于get_mem_cgroup_from_mm: Obtain a reference on given mm_struct's memcg.*@mm: mm from which memcg should be extracted. It can be NULL.* Obtain a reference on mm->memcg and returns it if successful. Otherwise* root_mem_cgroup is returned
6369  ret等于try_charge(memcg, gfp_mask, nr_pages)
6371  设置一个css引用
6372  out :
6373  memcgp等于memcg
6374  返回:ret
调用者
名称描述
unuse_pteNo need to decide whether this PTE shares the swap entry with others,* just let do_wp_page work it out if a write is requested later - to* force COW, vm_page_prot omits write permission from any private vma.
collapse_huge_page
mem_cgroup_try_charge_delay
mcopy_atomic_pte
__replace_page__replace_page - replace page in vma by new page
__add_to_page_cache_locked