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blk-mq: move the cache friendly bitmap type of out blk-mq-tag

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We will use it for the pending list in blk-mq core as well.

Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Jens Axboe 2014-05-19 09:17:48 -06:00
parent 2667bcbbd5
commit e93ecf602b
3 changed files with 17 additions and 11 deletions
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10
block/blk-mq-tag.c
View file

@ -21,7 +21,7 @@ static bool bt_has_free_tags(struct blk_mq_bitmap_tags *bt)
int i;
for (i = 0; i < bt->map_nr; i++) {
struct blk_mq_bitmap *bm = &bt->map[i];
struct blk_align_bitmap *bm = &bt->map[i];
int ret;
ret = find_first_zero_bit(&bm->word, bm->depth);
@ -40,7 +40,7 @@ bool blk_mq_has_free_tags(struct blk_mq_tags *tags)
return bt_has_free_tags(&tags->bitmap_tags);
}
static int __bt_get_word(struct blk_mq_bitmap *bm, unsigned int last_tag)
static int __bt_get_word(struct blk_align_bitmap *bm, unsigned int last_tag)
{
int tag, org_last_tag, end;
@ -283,7 +283,7 @@ static void bt_for_each_free(struct blk_mq_bitmap_tags *bt,
int i;
for (i = 0; i < bt->map_nr; i++) {
struct blk_mq_bitmap *bm = &bt->map[i];
struct blk_align_bitmap *bm = &bt->map[i];
int bit = 0;
do {
@ -323,7 +323,7 @@ static unsigned int bt_unused_tags(struct blk_mq_bitmap_tags *bt)
unsigned int i, used;
for (i = 0, used = 0; i < bt->map_nr; i++) {
struct blk_mq_bitmap *bm = &bt->map[i];
struct blk_align_bitmap *bm = &bt->map[i];
used += bitmap_weight(&bm->word, bm->depth);
}
@ -361,7 +361,7 @@ static int bt_alloc(struct blk_mq_bitmap_tags *bt, unsigned int depth,
}
nr = ALIGN(depth, tags_per_word) / tags_per_word;
bt->map = kzalloc_node(nr * sizeof(struct blk_mq_bitmap),
bt->map = kzalloc_node(nr * sizeof(struct blk_align_bitmap),
GFP_KERNEL, node);
if (!bt->map)
return -ENOMEM;

9
block/blk-mq-tag.h
View file

@ -1,6 +1,8 @@
#ifndef INT_BLK_MQ_TAG_H
#define INT_BLK_MQ_TAG_H
#include "blk-mq.h"
enum {
BT_WAIT_QUEUES = 8,
BT_WAIT_BATCH = 8,
@ -14,18 +16,13 @@ struct bt_wait_state {
#define TAG_TO_INDEX(bt, tag) ((tag) >> (bt)->bits_per_word)
#define TAG_TO_BIT(bt, tag) ((tag) & ((1 << (bt)->bits_per_word) - 1))
struct blk_mq_bitmap {
unsigned long word;
unsigned long depth;
} ____cacheline_aligned_in_smp;
struct blk_mq_bitmap_tags {
unsigned int depth;
unsigned int wake_cnt;
unsigned int bits_per_word;
unsigned int map_nr;
struct blk_mq_bitmap *map;
struct blk_align_bitmap *map;
unsigned int wake_index;
struct bt_wait_state *bs;

9
block/blk-mq.h
View file

@ -52,4 +52,13 @@ void blk_mq_disable_hotplug(void);
extern unsigned int *blk_mq_make_queue_map(struct blk_mq_tag_set *set);
extern int blk_mq_update_queue_map(unsigned int *map, unsigned int nr_queues);
/*
* Basic implementation of sparser bitmap, allowing the user to spread
* the bits over more cachelines.
*/
struct blk_align_bitmap {
unsigned long word;
unsigned long depth;
} ____cacheline_aligned_in_smp;
#endif