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dm: improve performance by moving dm_io structure to per-bio-data
Eliminates need for a separate mempool to allocate 'struct dm_io' objects from. As such, it saves an extra mempool allocation for each original bio that DM core is issued. This complicates the per-bio-data accessor functions by needing to conditonally add extra padding to get to a target's per-bio-data. But in the end this provides a decent performance improvement for all bio-based DM devices. On an NVMe-loop based testbed to a ramdisk (~3100 MB/s): bio-based DM linear performance improved by 2% (went from 2665 to 2777 MB/s). Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Mike Snitzer
parent
745dc570b2
commit
64f52b0e31
@ -91,6 +91,7 @@ struct mapped_device {
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/*
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* io objects are allocated from here.
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*/
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struct bio_set *io_bs;
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mempool_t *io_pool;
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struct bio_set *bs;
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171
drivers/md/dm.c
171
drivers/md/dm.c
@ -60,9 +60,38 @@ void dm_issue_global_event(void)
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}
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/*
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* One of these is allocated per original bio.
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* One of these is allocated (on-stack) per original bio.
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*/
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struct clone_info {
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struct mapped_device *md;
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struct dm_table *map;
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struct bio *bio;
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struct dm_io *io;
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sector_t sector;
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unsigned sector_count;
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};
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/*
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* One of these is allocated per clone bio.
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*/
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#define DM_TIO_MAGIC 7282014
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struct dm_target_io {
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unsigned magic;
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struct dm_io *io;
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struct dm_target *ti;
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unsigned target_bio_nr;
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unsigned *len_ptr;
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bool inside_dm_io;
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struct bio clone;
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};
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/*
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* One of these is allocated per original bio.
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* It contains the first clone used for that original.
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*/
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#define DM_IO_MAGIC 5191977
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struct dm_io {
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unsigned magic;
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struct mapped_device *md;
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blk_status_t status;
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atomic_t io_count;
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@ -70,8 +99,35 @@ struct dm_io {
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unsigned long start_time;
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spinlock_t endio_lock;
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struct dm_stats_aux stats_aux;
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/* last member of dm_target_io is 'struct bio' */
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struct dm_target_io tio;
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};
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void *dm_per_bio_data(struct bio *bio, size_t data_size)
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{
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struct dm_target_io *tio = container_of(bio, struct dm_target_io, clone);
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if (!tio->inside_dm_io)
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return (char *)bio - offsetof(struct dm_target_io, clone) - data_size;
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return (char *)bio - offsetof(struct dm_target_io, clone) - offsetof(struct dm_io, tio) - data_size;
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}
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EXPORT_SYMBOL_GPL(dm_per_bio_data);
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struct bio *dm_bio_from_per_bio_data(void *data, size_t data_size)
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{
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struct dm_io *io = (struct dm_io *)((char *)data + data_size);
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if (io->magic == DM_IO_MAGIC)
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return (struct bio *)((char *)io + offsetof(struct dm_io, tio) + offsetof(struct dm_target_io, clone));
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BUG_ON(io->magic != DM_TIO_MAGIC);
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return (struct bio *)((char *)io + offsetof(struct dm_target_io, clone));
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}
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EXPORT_SYMBOL_GPL(dm_bio_from_per_bio_data);
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unsigned dm_bio_get_target_bio_nr(const struct bio *bio)
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{
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return container_of(bio, struct dm_target_io, clone)->target_bio_nr;
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}
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EXPORT_SYMBOL_GPL(dm_bio_get_target_bio_nr);
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#define MINOR_ALLOCED ((void *)-1)
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/*
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@ -95,6 +151,7 @@ static int dm_numa_node = DM_NUMA_NODE;
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struct dm_md_mempools {
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mempool_t *io_pool;
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struct bio_set *bs;
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struct bio_set *io_bs;
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};
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struct table_device {
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@ -488,16 +545,58 @@ out:
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static struct dm_io *alloc_io(struct mapped_device *md)
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{
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return mempool_alloc(md->io_pool, GFP_NOIO);
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struct dm_io *io;
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struct dm_target_io *tio;
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struct bio *clone;
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clone = bio_alloc_bioset(GFP_NOIO, 0, md->io_bs);
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if (!clone)
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return NULL;
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tio = container_of(clone, struct dm_target_io, clone);
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tio->inside_dm_io = true;
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tio->io = NULL;
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io = container_of(tio, struct dm_io, tio);
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io->magic = DM_IO_MAGIC;
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return io;
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}
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static void free_io(struct mapped_device *md, struct dm_io *io)
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{
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mempool_free(io, md->io_pool);
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bio_put(&io->tio.clone);
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}
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static struct dm_target_io *alloc_tio(struct clone_info *ci, struct dm_target *ti,
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unsigned target_bio_nr, gfp_t gfp_mask)
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{
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struct dm_target_io *tio;
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if (!ci->io->tio.io) {
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/* the dm_target_io embedded in ci->io is available */
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tio = &ci->io->tio;
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} else {
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struct bio *clone = bio_alloc_bioset(gfp_mask, 0, ci->md->bs);
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if (!clone)
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return NULL;
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tio = container_of(clone, struct dm_target_io, clone);
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tio->inside_dm_io = false;
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}
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tio->magic = DM_TIO_MAGIC;
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tio->io = ci->io;
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tio->ti = ti;
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tio->target_bio_nr = target_bio_nr;
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return tio;
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}
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static void free_tio(struct dm_target_io *tio)
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{
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if (tio->inside_dm_io)
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return;
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bio_put(&tio->clone);
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}
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@ -1110,6 +1209,7 @@ static void __map_bio(struct dm_target_io *tio)
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int r;
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sector_t sector;
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struct bio *clone = &tio->clone;
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struct dm_io *io = tio->io;
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struct dm_target *ti = tio->ti;
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clone->bi_end_io = clone_endio;
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@ -1119,7 +1219,7 @@ static void __map_bio(struct dm_target_io *tio)
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* anything, the target has assumed ownership of
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* this io.
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*/
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atomic_inc(&tio->io->io_count);
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atomic_inc(&io->io_count);
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sector = clone->bi_iter.bi_sector;
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r = ti->type->map(ti, clone);
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@ -1129,16 +1229,16 @@ static void __map_bio(struct dm_target_io *tio)
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case DM_MAPIO_REMAPPED:
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/* the bio has been remapped so dispatch it */
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trace_block_bio_remap(clone->bi_disk->queue, clone,
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bio_dev(tio->io->orig_bio), sector);
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bio_dev(io->orig_bio), sector);
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generic_make_request(clone);
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break;
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case DM_MAPIO_KILL:
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dec_pending(tio->io, BLK_STS_IOERR);
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free_tio(tio);
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dec_pending(io, BLK_STS_IOERR);
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break;
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case DM_MAPIO_REQUEUE:
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dec_pending(tio->io, BLK_STS_DM_REQUEUE);
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free_tio(tio);
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dec_pending(io, BLK_STS_DM_REQUEUE);
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break;
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default:
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DMWARN("unimplemented target map return value: %d", r);
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@ -1146,15 +1246,6 @@ static void __map_bio(struct dm_target_io *tio)
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}
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}
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struct clone_info {
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struct mapped_device *md;
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struct dm_table *map;
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struct bio *bio;
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struct dm_io *io;
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sector_t sector;
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unsigned sector_count;
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};
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static void bio_setup_sector(struct bio *bio, sector_t sector, unsigned len)
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{
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bio->bi_iter.bi_sector = sector;
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@ -1197,24 +1288,6 @@ static int clone_bio(struct dm_target_io *tio, struct bio *bio,
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return 0;
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}
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static struct dm_target_io *alloc_tio(struct clone_info *ci, struct dm_target *ti,
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unsigned target_bio_nr, gfp_t gfp_mask)
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{
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struct dm_target_io *tio;
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struct bio *clone;
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clone = bio_alloc_bioset(gfp_mask, 0, ci->md->bs);
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if (!clone)
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return NULL;
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tio = container_of(clone, struct dm_target_io, clone);
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tio->io = ci->io;
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tio->ti = ti;
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tio->target_bio_nr = target_bio_nr;
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return tio;
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}
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static void alloc_multiple_bios(struct bio_list *blist, struct clone_info *ci,
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struct dm_target *ti, unsigned num_bios)
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{
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@ -1628,6 +1701,8 @@ static void cleanup_mapped_device(struct mapped_device *md)
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mempool_destroy(md->io_pool);
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if (md->bs)
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bioset_free(md->bs);
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if (md->io_bs)
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bioset_free(md->io_bs);
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if (md->dax_dev) {
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kill_dax(md->dax_dev);
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@ -1793,15 +1868,19 @@ static void __bind_mempools(struct mapped_device *md, struct dm_table *t)
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struct dm_md_mempools *p = dm_table_get_md_mempools(t);
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if (dm_table_bio_based(t)) {
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/* The md may already have mempools that need changing. */
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/*
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* The md may already have mempools that need changing.
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* If so, reload bioset because front_pad may have changed
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* because a different table was loaded.
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*/
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if (md->bs) {
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/*
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* Reload bioset because front_pad may have changed
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* because a different table was loaded.
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*/
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bioset_free(md->bs);
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md->bs = NULL;
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}
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if (md->io_bs) {
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bioset_free(md->io_bs);
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md->io_bs = NULL;
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}
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if (md->io_pool) {
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/*
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* Reload io_pool because pool_size may have changed
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@ -1823,12 +1902,14 @@ static void __bind_mempools(struct mapped_device *md, struct dm_table *t)
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goto out;
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}
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BUG_ON(!p || md->io_pool || md->bs);
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BUG_ON(!p || md->io_pool || md->bs || md->io_bs);
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md->io_pool = p->io_pool;
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p->io_pool = NULL;
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md->bs = p->bs;
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p->bs = NULL;
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md->io_bs = p->io_bs;
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p->io_bs = NULL;
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out:
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/* mempool bind completed, no longer need any mempools in the table */
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dm_table_free_md_mempools(t);
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@ -2719,7 +2800,7 @@ struct dm_md_mempools *dm_alloc_md_mempools(struct mapped_device *md, enum dm_qu
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{
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struct dm_md_mempools *pools = kzalloc_node(sizeof(*pools), GFP_KERNEL, md->numa_node_id);
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unsigned int pool_size = 0;
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unsigned int front_pad;
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unsigned int front_pad, io_front_pad;
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if (!pools)
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return NULL;
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@ -2729,6 +2810,12 @@ struct dm_md_mempools *dm_alloc_md_mempools(struct mapped_device *md, enum dm_qu
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case DM_TYPE_DAX_BIO_BASED:
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pool_size = max(dm_get_reserved_bio_based_ios(), min_pool_size);
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front_pad = roundup(per_io_data_size, __alignof__(struct dm_target_io)) + offsetof(struct dm_target_io, clone);
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io_front_pad = roundup(front_pad, __alignof__(struct dm_io)) + offsetof(struct dm_io, tio);
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pools->io_bs = bioset_create(pool_size, io_front_pad, 0);
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if (!pools->io_bs)
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goto out;
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if (integrity && bioset_integrity_create(pools->io_bs, pool_size))
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goto out;
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pools->io_pool = mempool_create_slab_pool(pool_size, _io_cache);
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if (!pools->io_pool)
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goto out;
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@ -2767,6 +2854,8 @@ void dm_free_md_mempools(struct dm_md_mempools *pools)
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if (pools->bs)
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bioset_free(pools->bs);
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if (pools->io_bs)
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bioset_free(pools->io_bs);
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kfree(pools);
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}
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@ -314,35 +314,9 @@ struct dm_target_callbacks {
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int (*congested_fn) (struct dm_target_callbacks *, int);
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};
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/*
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* For bio-based dm.
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* One of these is allocated for each bio.
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* This structure shouldn't be touched directly by target drivers.
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* It is here so that we can inline dm_per_bio_data and
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* dm_bio_from_per_bio_data
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*/
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struct dm_target_io {
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struct dm_io *io;
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struct dm_target *ti;
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unsigned target_bio_nr;
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unsigned *len_ptr;
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struct bio clone;
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};
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static inline void *dm_per_bio_data(struct bio *bio, size_t data_size)
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{
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return (char *)bio - offsetof(struct dm_target_io, clone) - data_size;
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}
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static inline struct bio *dm_bio_from_per_bio_data(void *data, size_t data_size)
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{
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return (struct bio *)((char *)data + data_size + offsetof(struct dm_target_io, clone));
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}
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static inline unsigned dm_bio_get_target_bio_nr(const struct bio *bio)
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{
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return container_of(bio, struct dm_target_io, clone)->target_bio_nr;
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}
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void *dm_per_bio_data(struct bio *bio, size_t data_size);
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struct bio *dm_bio_from_per_bio_data(void *data, size_t data_size);
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unsigned dm_bio_get_target_bio_nr(const struct bio *bio);
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int dm_register_target(struct target_type *t);
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void dm_unregister_target(struct target_type *t);
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