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0b6b098efc
Using a spinlock to atomically increase a counter sounds wrong -- we've atomic_t for this! Also move 'seq_nr' to a different cache line than 'lock' to reduce cache line trashing. This has the nice side effect of decreasing the size of struct parallel_data from 192 to 128 bytes for a x86-64 build, e.g. occupying only two instead of three cache lines. Those changes results in a 5% performance increase on an IPsec test run using pcrypt. Btw. the seq_lock spinlock was never explicitly initialized -- one more reason to get rid of it. Signed-off-by: Mathias Krause <mathias.krause@secunet.com> Acked-by: Steffen Klassert <steffen.klassert@secunet.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
190 lines
6.3 KiB
C
190 lines
6.3 KiB
C
/*
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* padata.h - header for the padata parallelization interface
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*
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* Copyright (C) 2008, 2009 secunet Security Networks AG
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* Copyright (C) 2008, 2009 Steffen Klassert <steffen.klassert@secunet.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#ifndef PADATA_H
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#define PADATA_H
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#include <linux/workqueue.h>
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#include <linux/spinlock.h>
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#include <linux/list.h>
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#include <linux/timer.h>
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#include <linux/notifier.h>
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#include <linux/kobject.h>
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#define PADATA_CPU_SERIAL 0x01
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#define PADATA_CPU_PARALLEL 0x02
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/**
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* struct padata_priv - Embedded to the users data structure.
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*
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* @list: List entry, to attach to the padata lists.
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* @pd: Pointer to the internal control structure.
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* @cb_cpu: Callback cpu for serializatioon.
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* @seq_nr: Sequence number of the parallelized data object.
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* @info: Used to pass information from the parallel to the serial function.
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* @parallel: Parallel execution function.
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* @serial: Serial complete function.
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*/
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struct padata_priv {
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struct list_head list;
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struct parallel_data *pd;
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int cb_cpu;
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int info;
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void (*parallel)(struct padata_priv *padata);
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void (*serial)(struct padata_priv *padata);
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};
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/**
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* struct padata_list
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*
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* @list: List head.
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* @lock: List lock.
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*/
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struct padata_list {
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struct list_head list;
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spinlock_t lock;
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};
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/**
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* struct padata_serial_queue - The percpu padata serial queue
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*
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* @serial: List to wait for serialization after reordering.
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* @work: work struct for serialization.
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* @pd: Backpointer to the internal control structure.
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*/
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struct padata_serial_queue {
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struct padata_list serial;
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struct work_struct work;
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struct parallel_data *pd;
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};
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/**
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* struct padata_parallel_queue - The percpu padata parallel queue
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*
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* @parallel: List to wait for parallelization.
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* @reorder: List to wait for reordering after parallel processing.
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* @serial: List to wait for serialization after reordering.
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* @pwork: work struct for parallelization.
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* @swork: work struct for serialization.
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* @pd: Backpointer to the internal control structure.
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* @work: work struct for parallelization.
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* @num_obj: Number of objects that are processed by this cpu.
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* @cpu_index: Index of the cpu.
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*/
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struct padata_parallel_queue {
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struct padata_list parallel;
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struct padata_list reorder;
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struct parallel_data *pd;
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struct work_struct work;
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atomic_t num_obj;
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int cpu_index;
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};
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/**
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* struct padata_cpumask - The cpumasks for the parallel/serial workers
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*
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* @pcpu: cpumask for the parallel workers.
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* @cbcpu: cpumask for the serial (callback) workers.
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*/
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struct padata_cpumask {
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cpumask_var_t pcpu;
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cpumask_var_t cbcpu;
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};
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/**
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* struct parallel_data - Internal control structure, covers everything
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* that depends on the cpumask in use.
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*
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* @pinst: padata instance.
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* @pqueue: percpu padata queues used for parallelization.
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* @squeue: percpu padata queues used for serialuzation.
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* @reorder_objects: Number of objects waiting in the reorder queues.
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* @refcnt: Number of objects holding a reference on this parallel_data.
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* @max_seq_nr: Maximal used sequence number.
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* @cpumask: The cpumasks in use for parallel and serial workers.
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* @lock: Reorder lock.
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* @processed: Number of already processed objects.
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* @timer: Reorder timer.
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*/
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struct parallel_data {
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struct padata_instance *pinst;
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struct padata_parallel_queue __percpu *pqueue;
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struct padata_serial_queue __percpu *squeue;
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atomic_t reorder_objects;
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atomic_t refcnt;
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atomic_t seq_nr;
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struct padata_cpumask cpumask;
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spinlock_t lock ____cacheline_aligned;
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unsigned int processed;
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struct timer_list timer;
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};
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/**
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* struct padata_instance - The overall control structure.
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*
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* @cpu_notifier: cpu hotplug notifier.
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* @wq: The workqueue in use.
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* @pd: The internal control structure.
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* @cpumask: User supplied cpumasks for parallel and serial works.
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* @cpumask_change_notifier: Notifiers chain for user-defined notify
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* callbacks that will be called when either @pcpu or @cbcpu
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* or both cpumasks change.
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* @kobj: padata instance kernel object.
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* @lock: padata instance lock.
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* @flags: padata flags.
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*/
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struct padata_instance {
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struct notifier_block cpu_notifier;
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struct workqueue_struct *wq;
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struct parallel_data *pd;
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struct padata_cpumask cpumask;
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struct blocking_notifier_head cpumask_change_notifier;
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struct kobject kobj;
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struct mutex lock;
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u8 flags;
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#define PADATA_INIT 1
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#define PADATA_RESET 2
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#define PADATA_INVALID 4
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};
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extern struct padata_instance *padata_alloc_possible(
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struct workqueue_struct *wq);
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extern struct padata_instance *padata_alloc(struct workqueue_struct *wq,
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const struct cpumask *pcpumask,
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const struct cpumask *cbcpumask);
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extern void padata_free(struct padata_instance *pinst);
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extern int padata_do_parallel(struct padata_instance *pinst,
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struct padata_priv *padata, int cb_cpu);
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extern void padata_do_serial(struct padata_priv *padata);
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extern int padata_set_cpumask(struct padata_instance *pinst, int cpumask_type,
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cpumask_var_t cpumask);
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extern int padata_set_cpumasks(struct padata_instance *pinst,
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cpumask_var_t pcpumask,
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cpumask_var_t cbcpumask);
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extern int padata_add_cpu(struct padata_instance *pinst, int cpu, int mask);
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extern int padata_remove_cpu(struct padata_instance *pinst, int cpu, int mask);
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extern int padata_start(struct padata_instance *pinst);
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extern void padata_stop(struct padata_instance *pinst);
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extern int padata_register_cpumask_notifier(struct padata_instance *pinst,
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struct notifier_block *nblock);
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extern int padata_unregister_cpumask_notifier(struct padata_instance *pinst,
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struct notifier_block *nblock);
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#endif
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