Commit 16295bec authored by Steffen Klassert's avatar Steffen Klassert Committed by Herbert Xu

padata: Generic parallelization/serialization interface

This patch introduces an interface to process data objects
in parallel. The parallelized objects return after serialization
in the same order as they were before the parallelization.
Signed-off-by: default avatarSteffen Klassert <>
Signed-off-by: default avatarHerbert Xu <>
parent 863b557a
* padata.h - header for the padata parallelization interface
* Copyright (C) 2008, 2009 secunet Security Networks AG
* Copyright (C) 2008, 2009 Steffen Klassert <>
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
#ifndef PADATA_H
#define PADATA_H
#include <linux/workqueue.h>
#include <linux/spinlock.h>
#include <linux/list.h>
struct padata_priv {
struct list_head list;
struct parallel_data *pd;
int cb_cpu;
int seq_nr;
int info;
void (*parallel)(struct padata_priv *padata);
void (*serial)(struct padata_priv *padata);
struct padata_list {
struct list_head list;
spinlock_t lock;
struct padata_queue {
struct padata_list parallel;
struct padata_list reorder;
struct padata_list serial;
struct work_struct pwork;
struct work_struct swork;
struct parallel_data *pd;
atomic_t num_obj;
int cpu_index;
struct parallel_data {
struct padata_instance *pinst;
struct padata_queue *queue;
atomic_t seq_nr;
atomic_t reorder_objects;
atomic_t refcnt;
unsigned int max_seq_nr;
cpumask_var_t cpumask;
spinlock_t lock;
struct padata_instance {
struct notifier_block cpu_notifier;
struct workqueue_struct *wq;
struct parallel_data *pd;
cpumask_var_t cpumask;
struct mutex lock;
u8 flags;
#define PADATA_INIT 1
#define PADATA_RESET 2
extern struct padata_instance *padata_alloc(const struct cpumask *cpumask,
struct workqueue_struct *wq);
extern void padata_free(struct padata_instance *pinst);
extern int padata_do_parallel(struct padata_instance *pinst,
struct padata_priv *padata, int cb_cpu);
extern void padata_do_serial(struct padata_priv *padata);
extern int padata_set_cpumask(struct padata_instance *pinst,
cpumask_var_t cpumask);
extern int padata_add_cpu(struct padata_instance *pinst, int cpu);
extern int padata_remove_cpu(struct padata_instance *pinst, int cpu);
extern void padata_start(struct padata_instance *pinst);
extern void padata_stop(struct padata_instance *pinst);
......@@ -1252,4 +1252,8 @@ source "block/Kconfig"
config PADATA
depends on SMP
source "kernel/Kconfig.locks"
......@@ -100,6 +100,7 @@ obj-$(CONFIG_SLOW_WORK_DEBUG) += slow-work-debugfs.o
obj-$(CONFIG_PERF_EVENTS) += perf_event.o
obj-$(CONFIG_HAVE_HW_BREAKPOINT) += hw_breakpoint.o
obj-$(CONFIG_USER_RETURN_NOTIFIER) += user-return-notifier.o
obj-$(CONFIG_PADATA) += padata.o
# According to Alan Modra <>, the -fno-omit-frame-pointer is
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