lock_cluster

Name:lock_cluster

Proto:static inline struct swap_cluster_info *lock_cluster(struct swap_info_struct *si, unsigned long offset)

Type:struct swap_cluster_info

Parameter:

Type	Parameter	Name
struct swap_info_struct *	si
unsigned long	offset

343

ci = cluster info. Only for SSD

344

If ci Then

345

ci += offset / SWAPFILE_CLUSTER

346

spin_lock( & Protect swap_cluster_info fields* and swap_info_struct->swap_map* elements correspond to the swap* cluster)

348

Return ci

**Caller**
Name	Describe
lock_cluster_or_swap_info	Determine the locking method in use for this device. Return* swap_cluster_info if SSD-style cluster-based locking is in place.
swap_do_scheduled_discard	Doing discard actually. After a cluster discard is finished, the cluster* will be added to free cluster list. caller should hold si->lock.
scan_swap_map_try_ssd_cluster	Try to get a swap entry from current cpu's swap entry pool (a cluster). This* might involve allocating a new cluster for current CPU too.
scan_swap_map_slots
swap_alloc_cluster
swap_free_cluster
swap_entry_free
page_trans_huge_map_swapcount
add_swap_count_continuation	add_swap_count_continuation - called when a swap count is duplicated* beyond SWAP_MAP_MAX, it allocates a new page and links that to the entry's* page of the original vmalloc'ed swap_map, to hold the continuation count

Source code conversion tool public plug-in interface	X
Support c/c++/esqlc/java Oracle/Informix/Mysql Plug-in can realize: logical Report Code generation and batch code conversion