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drop vmerge accounting

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Remove hw_segments field from struct bio and struct request. Without virtual
merge accounting they have no purpose.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
Mikulas Patocka 2008-08-15 10:20:02 +02:00 committed by Jens Axboe
parent b8b3e16cfe
commit 5df97b91b5
8 changed files with 6 additions and 69 deletions
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1
block/blk-core.c
View file

@ -2026,7 +2026,6 @@ void blk_rq_bio_prep(struct request_queue *q, struct request *rq,
if (bio_has_data(bio)) {
rq->nr_phys_segments = bio_phys_segments(q, bio);
rq->nr_hw_segments = bio_hw_segments(q, bio);
rq->buffer = bio_data(bio);
}
rq->current_nr_sectors = bio_cur_sectors(bio);

31
block/blk-merge.c
View file

@ -41,12 +41,9 @@ void blk_recalc_rq_sectors(struct request *rq, int nsect)
void blk_recalc_rq_segments(struct request *rq)
{
int nr_phys_segs;
int nr_hw_segs;
unsigned int phys_size;
unsigned int hw_size;
struct bio_vec *bv, *bvprv = NULL;
int seg_size;
int hw_seg_size;
int cluster;
struct req_iterator iter;
int high, highprv = 1;
@ -56,8 +53,8 @@ void blk_recalc_rq_segments(struct request *rq)
return;
cluster = test_bit(QUEUE_FLAG_CLUSTER, &q->queue_flags);
hw_seg_size = seg_size = 0;
phys_size = hw_size = nr_phys_segs = nr_hw_segs = 0;
seg_size = 0;
phys_size = nr_phys_segs = 0;
rq_for_each_segment(bv, rq, iter) {
/*
* the trick here is making sure that a high page is never
@ -76,30 +73,17 @@ void blk_recalc_rq_segments(struct request *rq)
goto new_segment;
seg_size += bv->bv_len;
hw_seg_size += bv->bv_len;
bvprv = bv;
continue;
}
new_segment:
if (nr_hw_segs == 1 &&
hw_seg_size > rq->bio->bi_hw_front_size)
rq->bio->bi_hw_front_size = hw_seg_size;
hw_seg_size = bv->bv_len;
nr_hw_segs++;
nr_phys_segs++;
bvprv = bv;
seg_size = bv->bv_len;
highprv = high;
}
if (nr_hw_segs == 1 &&
hw_seg_size > rq->bio->bi_hw_front_size)
rq->bio->bi_hw_front_size = hw_seg_size;
if (hw_seg_size > rq->biotail->bi_hw_back_size)
rq->biotail->bi_hw_back_size = hw_seg_size;
rq->nr_phys_segments = nr_phys_segs;
rq->nr_hw_segments = nr_hw_segs;
}
void blk_recount_segments(struct request_queue *q, struct bio *bio)
@ -112,7 +96,6 @@ void blk_recount_segments(struct request_queue *q, struct bio *bio)
blk_recalc_rq_segments(&rq);
bio->bi_next = nxt;
bio->bi_phys_segments = rq.nr_phys_segments;
bio->bi_hw_segments = rq.nr_hw_segments;
bio->bi_flags |= (1 << BIO_SEG_VALID);
}
EXPORT_SYMBOL(blk_recount_segments);
@ -255,10 +238,9 @@ static inline int ll_new_hw_segment(struct request_queue *q,
struct request *req,
struct bio *bio)
{
int nr_hw_segs = bio_hw_segments(q, bio);
int nr_phys_segs = bio_phys_segments(q, bio);
if (req->nr_hw_segments + nr_hw_segs > q->max_hw_segments
if (req->nr_phys_segments + nr_phys_segs > q->max_hw_segments
|| req->nr_phys_segments + nr_phys_segs > q->max_phys_segments) {
req->cmd_flags |= REQ_NOMERGE;
if (req == q->last_merge)
@ -270,7 +252,6 @@ static inline int ll_new_hw_segment(struct request_queue *q,
* This will form the start of a new hw segment. Bump both
* counters.
*/
req->nr_hw_segments += nr_hw_segs;
req->nr_phys_segments += nr_phys_segs;
return 1;
}
@ -328,7 +309,6 @@ static int ll_merge_requests_fn(struct request_queue *q, struct request *req,
struct request *next)
{
int total_phys_segments;
int total_hw_segments;
/*
* First check if the either of the requests are re-queued
@ -350,14 +330,11 @@ static int ll_merge_requests_fn(struct request_queue *q, struct request *req,
if (total_phys_segments > q->max_phys_segments)
return 0;
total_hw_segments = req->nr_hw_segments + next->nr_hw_segments;
if (total_hw_segments > q->max_hw_segments)
if (total_phys_segments > q->max_hw_segments)
return 0;
/* Merge is OK... */
req->nr_phys_segments = total_phys_segments;
req->nr_hw_segments = total_hw_segments;
return 1;
}

2
block/elevator.c
View file

@ -790,7 +790,6 @@ struct request *elv_next_request(struct request_queue *q)
* device can handle
*/
rq->nr_phys_segments++;
rq->nr_hw_segments++;
}
if (!q->prep_rq_fn)
@ -813,7 +812,6 @@ struct request *elv_next_request(struct request_queue *q)
* so that we don't add it again
*/
--rq->nr_phys_segments;
--rq->nr_hw_segments;
}
rq = NULL;

3
drivers/md/raid1.c
View file

@ -1302,9 +1302,6 @@ static void sync_request_write(mddev_t *mddev, r1bio_t *r1_bio)
sbio->bi_size = r1_bio->sectors << 9;
sbio->bi_idx = 0;
sbio->bi_phys_segments = 0;
sbio->bi_hw_segments = 0;
sbio->bi_hw_front_size = 0;
sbio->bi_hw_back_size = 0;
sbio->bi_flags &= ~(BIO_POOL_MASK - 1);
sbio->bi_flags |= 1 << BIO_UPTODATE;
sbio->bi_next = NULL;

3
drivers/md/raid10.c
View file

@ -1345,9 +1345,6 @@ static void sync_request_write(mddev_t *mddev, r10bio_t *r10_bio)
tbio->bi_size = r10_bio->sectors << 9;
tbio->bi_idx = 0;
tbio->bi_phys_segments = 0;
tbio->bi_hw_segments = 0;
tbio->bi_hw_front_size = 0;
tbio->bi_hw_back_size = 0;
tbio->bi_flags &= ~(BIO_POOL_MASK - 1);
tbio->bi_flags |= 1 << BIO_UPTODATE;
tbio->bi_next = NULL;

12
fs/bio.c
View file

@ -208,14 +208,6 @@ inline int bio_phys_segments(struct request_queue *q, struct bio *bio)
return bio->bi_phys_segments;
}
inline int bio_hw_segments(struct request_queue *q, struct bio *bio)
{
if (unlikely(!bio_flagged(bio, BIO_SEG_VALID)))
blk_recount_segments(q, bio);
return bio->bi_hw_segments;
}
/**
* __bio_clone - clone a bio
* @bio: destination bio
@ -350,7 +342,7 @@ static int __bio_add_page(struct request_queue *q, struct bio *bio, struct page
*/
while (bio->bi_phys_segments >= q->max_phys_segments
|| bio->bi_hw_segments >= q->max_hw_segments) {
|| bio->bi_phys_segments >= q->max_hw_segments) {
if (retried_segments)
return 0;
@ -399,7 +391,6 @@ static int __bio_add_page(struct request_queue *q, struct bio *bio, struct page
bio->bi_vcnt++;
bio->bi_phys_segments++;
bio->bi_hw_segments++;
done:
bio->bi_size += len;
return len;
@ -1381,7 +1372,6 @@ EXPORT_SYMBOL(bio_init);
EXPORT_SYMBOL(__bio_clone);
EXPORT_SYMBOL(bio_clone);
EXPORT_SYMBOL(bio_phys_segments);
EXPORT_SYMBOL(bio_hw_segments);
EXPORT_SYMBOL(bio_add_page);
EXPORT_SYMBOL(bio_add_pc_page);
EXPORT_SYMBOL(bio_get_nr_vecs);

16
include/linux/bio.h
View file

@ -77,21 +77,8 @@ struct bio {
*/
unsigned short bi_phys_segments;
/* Number of segments after physical and DMA remapping
* hardware coalescing is performed.
*/
unsigned short bi_hw_segments;
unsigned int bi_size; /* residual I/O count */
/*
* To keep track of the max hw size, we account for the
* sizes of the first and last virtually mergeable segments
* in this bio
*/
unsigned int bi_hw_front_size;
unsigned int bi_hw_back_size;
unsigned int bi_max_vecs; /* max bvl_vecs we can hold */
struct bio_vec *bi_io_vec; /* the actual vec list */
@ -113,7 +100,7 @@ struct bio {
#define BIO_UPTODATE 0 /* ok after I/O completion */
#define BIO_RW_BLOCK 1 /* RW_AHEAD set, and read/write would block */
#define BIO_EOF 2 /* out-out-bounds error */
#define BIO_SEG_VALID 3 /* nr_hw_seg valid */
#define BIO_SEG_VALID 3 /* bi_phys_segments valid */
#define BIO_CLONED 4 /* doesn't own data */
#define BIO_BOUNCED 5 /* bio is a bounce bio */
#define BIO_USER_MAPPED 6 /* contains user pages */
@ -324,7 +311,6 @@ extern void bio_free(struct bio *, struct bio_set *);
extern void bio_endio(struct bio *, int);
struct request_queue;
extern int bio_phys_segments(struct request_queue *, struct bio *);
extern int bio_hw_segments(struct request_queue *, struct bio *);
extern void __bio_clone(struct bio *, struct bio *);
extern struct bio *bio_clone(struct bio *, gfp_t);

7
include/linux/blkdev.h
View file

@ -189,13 +189,6 @@ struct request {
*/
unsigned short nr_phys_segments;
/* Number of scatter-gather addr+len pairs after
* physical and DMA remapping hardware coalescing is performed.
* This is the number of scatter-gather entries the driver
* will actually have to deal with after DMA mapping is done.
*/
unsigned short nr_hw_segments;
unsigned short ioprio;
void *special;