pcpu_block_update

Name:pcpu_block_update - updates a block given a free area*@block: block of interest*@start: start offset in block*@end: end offset in block* Updates a block given a known free area. The region [start, end) is

Proto:static void pcpu_block_update(struct pcpu_block_md *block, int start, int end)

Type:void

Parameter:

Type	Parameter	Name
struct pcpu_block_md *	block
int	start
int	end

605

contig = end - start

607

lock position of first free = min - return minimum of two values of the same or compatible types*@x: first value*@y: second value(lock position of first free , start)

608

If start == 0 Then size of free space alongthe left side of the block = contig

611

If end == al bits responsible for Then size of free space alongthe right side of the block = contig

614

If contig > contig hint for block Then

616

If start > lock relative startingposition of the contig hint Then

617

If contig hint for block > scan hint for block Then

618

lock relative startingposition of the scan hint = lock relative startingposition of the contig hint

620

scan hint for block = contig hint for block

621

Else if start < lock relative startingposition of the scan hint Then

627

scan hint for block = 0

629

Else

630

scan hint for block = 0

632

lock relative startingposition of the contig hint = start

633

contig hint for block = contig

634

Else if contig == contig hint for block Then

635

If lock relative startingposition of the contig hint && ( Not start || __ffs - find first set bit in word*@word: The word to search* Undefined if no bit exists, so code should check against 0 first. > __ffs - find first set bit in word*@word: The word to search* Undefined if no bit exists, so code should check against 0 first. ) Then

639

lock relative startingposition of the contig hint = start

640

If start < lock relative startingposition of the scan hint && contig hint for block > scan hint for block Then scan hint for block = 0

643

Else if start > lock relative startingposition of the scan hint || contig hint for block > scan hint for block Then

650

lock relative startingposition of the scan hint = start

651

scan hint for block = contig

653

Else

659

If start < lock relative startingposition of the contig hint && ( contig > scan hint for block || contig == scan hint for block && start > lock relative startingposition of the scan hint ) Then

663

lock relative startingposition of the scan hint = start

664

scan hint for block = contig

**Caller**
Name	Describe
pcpu_block_update_scan	pcpu_block_update_scan - update a block given a free area from a scan@chunk: chunk of interest@bit_off: chunk offset@bits: size of free area Finding the final allocation spot first goes through pcpu_find_block_fit()* to find a block that can hold the
pcpu_chunk_refresh_hint	pcpu_chunk_refresh_hint - updates metadata about a chunk@chunk: chunk of interest@full_scan: if we should scan from the beginning* Iterates over the metadata blocks to find the largest contig area
pcpu_block_refresh_hint	pcpu_block_refresh_hint@chunk: chunk of interest@index: index of the metadata block* Scans over the block beginning at first_free and updates the block* metadata accordingly.
pcpu_block_update_hint_free	pcpu_block_update_hint_free - updates the block hints on the free path@chunk: chunk of interest@bit_off: chunk offset@bits: size of request Updates metadata for the allocation path. This avoids a blind block

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

Function report