include/linux/padata.h

Source file repositories/reference/linux-study-clean/include/linux/padata.h

File Facts

System
Linux kernel
Corpus path
include/linux/padata.h
Extension
.h
Size
6377 bytes
Lines
198
Domain
Core OS
Bucket
Core Kernel Interface
Inferred role
Core OS: implementation source
Status
source implementation candidate

Why This File Exists

Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.

Dependency Surface

Detected Declarations

Annotated Snippet

struct padata_priv {
	struct list_head	list;
	struct parallel_data	*pd;
	int			cb_cpu;
	unsigned int		seq_nr;
	int			info;
	void                    (*parallel)(struct padata_priv *padata);
	void                    (*serial)(struct padata_priv *padata);
};

/**
 * struct padata_list - one per work type per CPU
 *
 * @list: List head.
 * @lock: List lock.
 */
struct padata_list {
	struct list_head        list;
	spinlock_t              lock;
};

/**
* struct padata_serial_queue - The percpu padata serial queue
*
* @serial: List to wait for serialization after reordering.
* @work: work struct for serialization.
* @pd: Backpointer to the internal control structure.
*/
struct padata_serial_queue {
       struct padata_list    serial;
       struct work_struct    work;
       struct parallel_data *pd;
};

/**
 * struct padata_cpumask - The cpumasks for the parallel/serial workers
 *
 * @pcpu: cpumask for the parallel workers.
 * @cbcpu: cpumask for the serial (callback) workers.
 */
struct padata_cpumask {
	cpumask_var_t	pcpu;
	cpumask_var_t	cbcpu;
};

/**
 * struct parallel_data - Internal control structure, covers everything
 * that depends on the cpumask in use.
 *
 * @ps: padata_shell object.
 * @reorder_list: percpu reorder lists
 * @squeue: percpu padata queues used for serialuzation.
 * @refcnt: Number of objects holding a reference on this parallel_data.
 * @seq_nr: Sequence number of the parallelized data object.
 * @processed: Number of already processed objects.
 * @cpu: Next CPU to be processed.
 * @cpumask: The cpumasks in use for parallel and serial workers.
 */
struct parallel_data {
	struct padata_shell		*ps;
	struct padata_list		__percpu *reorder_list;
	struct padata_serial_queue	__percpu *squeue;
	refcount_t			refcnt;
	unsigned int			seq_nr;
	unsigned int			processed;
	int				cpu;
	struct padata_cpumask		cpumask;
};

/**
 * struct padata_shell - Wrapper around struct parallel_data, its
 * purpose is to allow the underlying control structure to be replaced
 * on the fly using RCU.
 *
 * @pinst: padat instance.
 * @pd: Actual parallel_data structure which may be substituted on the fly.
 * @opd: Pointer to old pd to be freed by padata_replace.
 * @list: List entry in padata_instance list.
 */
struct padata_shell {
	struct padata_instance		*pinst;
	struct parallel_data __rcu	*pd;
	struct parallel_data		*opd;
	struct list_head		list;
};

/**
 * struct padata_mt_job - represents one multithreaded job
 *
 * @thread_fn: Called for each chunk of work that a padata thread does.

Annotation

Implementation Notes