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dm mpath: pass IO start time to path selector

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The HST path selector needs this information to perform path
prediction. For request-based mpath, struct request's io_start_time_ns
is used, while for bio-based, use the start_time stored in dm_io.

Signed-off-by: Gabriel Krisman Bertazi <krisman@collabora.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Gabriel Krisman Bertazi 2020-04-30 16:48:29 -04:00 committed by Mike Snitzer
parent 48338daaa0
commit 087615bf3a
6 changed files with 20 additions and 6 deletions
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9
drivers/md/dm-mpath.c
View File

@ -567,7 +567,8 @@ static void multipath_release_clone(struct request *clone,
if (pgpath && pgpath->pg->ps.type->end_io)
pgpath->pg->ps.type->end_io(&pgpath->pg->ps,
&pgpath->path,
mpio->nr_bytes);
mpio->nr_bytes,
clone->io_start_time_ns);
}
blk_put_request(clone);
@ -1617,7 +1618,8 @@ static int multipath_end_io(struct dm_target *ti, struct request *clone,
struct path_selector *ps = &pgpath->pg->ps;
if (ps->type->end_io)
ps->type->end_io(ps, &pgpath->path, mpio->nr_bytes);
ps->type->end_io(ps, &pgpath->path, mpio->nr_bytes,
clone->io_start_time_ns);
}
return r;
@ -1661,7 +1663,8 @@ static int multipath_end_io_bio(struct dm_target *ti, struct bio *clone,
struct path_selector *ps = &pgpath->pg->ps;
if (ps->type->end_io)
ps->type->end_io(ps, &pgpath->path, mpio->nr_bytes);
ps->type->end_io(ps, &pgpath->path, mpio->nr_bytes,
dm_start_time_ns_from_clone(clone));
}
return r;

2
drivers/md/dm-path-selector.h
View File

@ -74,7 +74,7 @@ struct path_selector_type {
int (*start_io) (struct path_selector *ps, struct dm_path *path,
size_t nr_bytes);
int (*end_io) (struct path_selector *ps, struct dm_path *path,
size_t nr_bytes);
size_t nr_bytes, u64 start_time);
};
/* Register a path selector */

2
drivers/md/dm-queue-length.c
View File

@ -227,7 +227,7 @@ static int ql_start_io(struct path_selector *ps, struct dm_path *path,
}
static int ql_end_io(struct path_selector *ps, struct dm_path *path,
size_t nr_bytes)
size_t nr_bytes, u64 start_time)
{
struct path_info *pi = path->pscontext;

2
drivers/md/dm-service-time.c
View File

@ -309,7 +309,7 @@ static int st_start_io(struct path_selector *ps, struct dm_path *path,
}
static int st_end_io(struct path_selector *ps, struct dm_path *path,
size_t nr_bytes)
size_t nr_bytes, u64 start_time)
{
struct path_info *pi = path->pscontext;

9
drivers/md/dm.c
View File

@ -675,6 +675,15 @@ static bool md_in_flight(struct mapped_device *md)
return md_in_flight_bios(md);
}
u64 dm_start_time_ns_from_clone(struct bio *bio)
{
struct dm_target_io *tio = container_of(bio, struct dm_target_io, clone);
struct dm_io *io = tio->io;
return jiffies_to_nsecs(io->start_time);
}
EXPORT_SYMBOL_GPL(dm_start_time_ns_from_clone);
static void start_io_acct(struct dm_io *io)
{
struct mapped_device *md = io->md;

2
include/linux/device-mapper.h
View File

@ -332,6 +332,8 @@ void *dm_per_bio_data(struct bio *bio, size_t data_size);
struct bio *dm_bio_from_per_bio_data(void *data, size_t data_size);
unsigned dm_bio_get_target_bio_nr(const struct bio *bio);
u64 dm_start_time_ns_from_clone(struct bio *bio);
int dm_register_target(struct target_type *t);
void dm_unregister_target(struct target_type *t);