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padata: Add some code comments

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Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Steffen Klassert 2010-05-19 13:44:27 +10:00 • committed by Herbert Xu
parent 2b73b07ab8
commit 0198ffd135
2 changed files with 110 additions and 11 deletions
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53
include/linux/padata.h
View file

@ -26,6 +26,17 @@
#include <linux/list.h>
#include <linux/timer.h>
/**
* struct padata_priv - Embedded to the users data structure.
*
* @list: List entry, to attach to the padata lists.
* @pd: Pointer to the internal control structure.
* @cb_cpu: Callback cpu for serializatioon.
* @seq_nr: Sequence number of the parallelized data object.
* @info: Used to pass information from the parallel to the serial function.
* @parallel: Parallel execution function.
* @serial: Serial complete function.
*/
struct padata_priv {
struct list_head list;
struct parallel_data *pd;
@ -36,11 +47,29 @@ struct padata_priv {
void (*serial)(struct padata_priv *padata);
};
/**
* struct padata_list
*
* @list: List head.
* @lock: List lock.
*/
struct padata_list {
struct list_head list;
spinlock_t lock;
};
/**
* struct padata_queue - The percpu padata queues.
*
* @parallel: List to wait for parallelization.
* @reorder: List to wait for reordering after parallel processing.
* @serial: List to wait for serialization after reordering.
* @pwork: work struct for parallelization.
* @swork: work struct for serialization.
* @pd: Backpointer to the internal control structure.
* @num_obj: Number of objects that are processed by this cpu.
* @cpu_index: Index of the cpu.
*/
struct padata_queue {
struct padata_list parallel;
struct padata_list reorder;
@ -52,6 +81,20 @@ struct padata_queue {
int cpu_index;
};
/**
* struct parallel_data - Internal control structure, covers everything
* that depends on the cpumask in use.
*
* @pinst: padata instance.
* @queue: percpu padata queues.
* @seq_nr: The sequence number that will be attached to the next object.
* @reorder_objects: Number of objects waiting in the reorder queues.
* @refcnt: Number of objects holding a reference on this parallel_data.
* @max_seq_nr: Maximal used sequence number.
* @cpumask: cpumask in use.
* @lock: Reorder lock.
* @timer: Reorder timer.
*/
struct parallel_data {
struct padata_instance *pinst;
struct padata_queue *queue;
@ -64,6 +107,16 @@ struct parallel_data {
struct timer_list timer;
};
/**
* struct padata_instance - The overall control structure.
*
* @cpu_notifier: cpu hotplug notifier.
* @wq: The workqueue in use.
* @pd: The internal control structure.
* @cpumask: User supplied cpumask.
* @lock: padata instance lock.
* @flags: padata flags.
*/
struct padata_instance {
struct notifier_block cpu_notifier;
struct workqueue_struct *wq;