函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:mm\z3fold.c Create Date:2022-07-27 18:05:35
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：z3fold_reclaim_page() - evicts allocations from a pool page and frees it*@pool: pool from which a page will attempt to be evicted*@retries: number of pages on the LRU list for which eviction will* be attempted before failing* z3fold reclaim is different

函数原型：static int z3fold_reclaim_page(struct z3fold_pool *pool, unsigned int retries)

返回类型：int

参数：

类型参数名称
struct z3fold_pool *pool
unsigned intretries
1341  ret等于负1
1342  struct z3fold_header * zhdr = NULL
1343  struct page * page = NULL
1345  first_handle等于0, middle_handle等于0, last_handle等于0
1347  加自旋锁
1348  如果非ops或非evict或retries恒等于0则
1349  自旋锁解锁
1350  返回:负EINVAL
1352  以i小于retries循环
1353  如果链表为空则
1354  自旋锁解锁
1355  返回:负EINVAL
1358  page等于list_entry - get the struct for this entry*@ptr: the &struct list_head pointer.*@type: the type of the struct this is embedded in.*@member: the name of the list_head within the struct.(pos, structpage, lru)
1363  如果st_and_set_bit - Set a bit and return its old value*@nr: Bit to set*@addr: Address to count from* This is an atomic fully-ordered operation (implied full memory barrier).则
1364  page = NULL
1365  继续下一循环
1368  如果此条件成立可能性小(为编译器优化)(PageIsolated(page))则
1373  zhdr等于page_address(page)
1374  如果st_bit - Determine whether a bit is set*@nr: bit number to test*@addr: Address to start counting from则退出
1377  如果非Try to lock a z3fold page 则
1382  如果foreign_handles则
1388  对象增加引用
1389  删除链表项并重新初始化
1390  cpu等于负1
1391  退出
1394  如果非zhdr则退出
1397  删除链表项并重新初始化
1398  自旋锁解锁
1400  如果非st_bit - Determine whether a bit is set*@nr: bit number to test*@addr: Address to start counting from则
1407  first_handle等于0
1408  last_handle等于0
1409  middle_handle等于0
1410  如果first_chunks则first_handle等于encode_handle(zhdr, FIRST)
1412  如果middle_chunks则middle_handle等于encode_handle(zhdr, MIDDLE)
1414  如果last_chunks则last_handle等于encode_handle(zhdr, LAST)
1420  Unlock a z3fold page
1421  否则
1422  first_handle等于encode_handle(zhdr, HEADLESS)
1423  last_handle等于middle_handle等于0
1426  如果middle_handle则
1427  ret等于evict(pool, middle_handle)
1428  如果ret则转到:next
1430  free_handle(middle_handle)
1432  如果first_handle则
1433  ret等于evict(pool, first_handle)
1434  如果ret则转到:next
1436  free_handle(first_handle)
1438  如果last_handle则
1439  ret等于evict(pool, last_handle)
1440  如果ret则转到:next
1442  free_handle(last_handle)
1444  :
1445  如果st_bit - Determine whether a bit is set*@nr: bit number to test*@addr: Address to start counting from则
1446  如果ret恒等于0则
1451  加自旋锁
1452  添加链表项
1453  自旋锁解锁
1454  lear_bit - Clears a bit in memory*@nr: Bit to clear*@addr: Address to start counting from* This is a relaxed atomic operation (no implied memory barriers).
1455  否则
1456  Lock a z3fold page
1457  如果kref_put - decrement refcount for object.*@kref: object.*@release: pointer to the function that will clean up the object when the* last reference to the object is released.* This pointer is required, and it is not acceptable to pass kfree则
1459  atomic64_dec( & pages_nr)
1460  返回:0
1467  加自旋锁
1468  添加链表项
1469  自旋锁解锁
1470  Unlock a z3fold page
1471  lear_bit - Clears a bit in memory*@nr: Bit to clear*@addr: Address to start counting from* This is a relaxed atomic operation (no implied memory barriers).
1475  加自旋锁
1477  自旋锁解锁
1478  返回:负EAGAIN
调用者
名称描述
z3fold_zpool_shrink