函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:mm\page_alloc.c Create Date:2022-07-27 16:33:44
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：Frees a number of pages from the PCP lists* Assumes all pages on list are in same zone, and of same order.* count is the number of pages to free.* If the zone was previously in an "all pages pinned" state then look to

函数原型：static void free_pcppages_bulk(struct zone *zone, int count, struct per_cpu_pages *pcp)

返回类型：void

参数：

类型参数名称
struct zone *zone
intcount
struct per_cpu_pages *pcp
1252  migratetype等于0
1253  batch_free等于0
1254  prefetch_nr等于0
1257  LIST_HEAD(head)
1259  当count循环
1269  循环
1270  batch_free自加
1271  如果migratetype先自加恒等于MIGRATE_PCPTYPES则migratetype等于0
1273  list等于 Lists of pages, one per migrate type stored on the pcp-lists [migratetype]
1274  当链表为空循环
1277  如果batch_free恒等于MIGRATE_PCPTYPES则batch_free等于count
1280  循环
1281  page等于list_last_entry - get the last element from a list*@ptr: the list head to take the element from.*@type: the type of the struct this is embedded in.*@member: the name of the list_head within the struct.* Note, that list is expected to be not empty.(list, structpage, lru)
1283  删除链表项
1284  number of pages in the list 自减
1286  如果bulkfree_pcp_prepare(page)则继续下一循环
1289  添加链表项
1300  如果prefetch_nr自加小于 chunk size for buddy add/remove 则prefetch_buddy(page)
1302  当count先自减且batch_free先自减且非链表为空循环
1305  加自旋锁
1306  isolated_pageblocks等于has_isolate_pageblock(zone)
1313  mt等于A cached value of the page's pageblock's migratetype, used when the page is* put on a pcplist
1315  VM_BUG_ON_PAGE(is_migrate_isolate(mt), page)
1317  如果此条件成立可能性小(为编译器优化)(isolated_pageblocks)则mt等于get_pageblock_migratetype(page)
1320  Freeing function for a buddy system allocator
1321  trace_mm_page_pcpu_drain(page, 0, mt)
1323  自旋锁解锁
调用者
名称描述
drain_zone_pagesCalled from the vmstat counter updater to drain pagesets of this* currently executing processor on remote nodes after they have* expired.* Note that this function must be called with the thread pinned to* a single processor.
drain_pages_zoneDrain pcplists of the indicated processor and zone.* The processor must either be the current processor and the* thread pinned to the current processor or a processor that* is not online.
free_unref_page_commit