e26b53d0b2
Make percpu_ida percpu size/batch configurable. The block-mq-tag will use it. After block-mq uses percpu_ida to manage tags, performance is improved. My test is done in a 2 sockets machine, 12 process cross the 2 sockets. So if there is lock contention or ipi, should be stressed heavily. Testing is done for null-blk. hw_queue_depth nopatch iops patch iops 64 ~800k/s ~1470k/s 2048 ~4470k/s ~4340k/s Cc: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Shaohua Li <shli@fusionio.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
77 lines
2.1 KiB
C
77 lines
2.1 KiB
C
#ifndef __PERCPU_IDA_H__
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#define __PERCPU_IDA_H__
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#include <linux/types.h>
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#include <linux/bitops.h>
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#include <linux/init.h>
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#include <linux/spinlock_types.h>
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#include <linux/wait.h>
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#include <linux/cpumask.h>
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struct percpu_ida_cpu;
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struct percpu_ida {
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/*
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* number of tags available to be allocated, as passed to
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* percpu_ida_init()
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*/
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unsigned nr_tags;
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unsigned percpu_max_size;
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unsigned percpu_batch_size;
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struct percpu_ida_cpu __percpu *tag_cpu;
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/*
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* Bitmap of cpus that (may) have tags on their percpu freelists:
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* steal_tags() uses this to decide when to steal tags, and which cpus
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* to try stealing from.
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*
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* It's ok for a freelist to be empty when its bit is set - steal_tags()
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* will just keep looking - but the bitmap _must_ be set whenever a
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* percpu freelist does have tags.
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*/
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cpumask_t cpus_have_tags;
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struct {
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spinlock_t lock;
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/*
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* When we go to steal tags from another cpu (see steal_tags()),
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* we want to pick a cpu at random. Cycling through them every
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* time we steal is a bit easier and more or less equivalent:
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*/
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unsigned cpu_last_stolen;
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/* For sleeping on allocation failure */
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wait_queue_head_t wait;
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/*
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* Global freelist - it's a stack where nr_free points to the
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* top
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*/
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unsigned nr_free;
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unsigned *freelist;
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} ____cacheline_aligned_in_smp;
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};
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/*
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* Number of tags we move between the percpu freelist and the global freelist at
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* a time
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*/
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#define IDA_DEFAULT_PCPU_BATCH_MOVE 32U
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/* Max size of percpu freelist, */
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#define IDA_DEFAULT_PCPU_SIZE ((IDA_DEFAULT_PCPU_BATCH_MOVE * 3) / 2)
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int percpu_ida_alloc(struct percpu_ida *pool, gfp_t gfp);
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void percpu_ida_free(struct percpu_ida *pool, unsigned tag);
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void percpu_ida_destroy(struct percpu_ida *pool);
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int __percpu_ida_init(struct percpu_ida *pool, unsigned long nr_tags,
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unsigned long max_size, unsigned long batch_size);
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static inline int percpu_ida_init(struct percpu_ida *pool, unsigned long nr_tags)
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{
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return __percpu_ida_init(pool, nr_tags, IDA_DEFAULT_PCPU_SIZE,
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IDA_DEFAULT_PCPU_BATCH_MOVE);
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}
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#endif /* __PERCPU_IDA_H__ */
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