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bcache: Kill sequential_merge option

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It never really made sense to expose this, so just kill it.

Signed-off-by: Kent Overstreet <kmo@daterainc.com>
This commit is contained in:
Kent Overstreet 2013-07-30 22:34:40 -07:00
parent 50310164bc
commit 8aee122071
4 changed files with 18 additions and 31 deletions
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1
drivers/md/bcache/bcache.h
View File

@ -364,7 +364,6 @@ struct cached_dev {
unsigned sequential_cutoff;
unsigned readahead;
unsigned sequential_merge:1;
unsigned verify:1;
unsigned partial_stripes_expensive:1;

43
drivers/md/bcache/request.c
View File

@ -510,6 +510,7 @@ static bool check_should_bypass(struct cached_dev *dc, struct bio *bio)
unsigned mode = cache_mode(dc, bio);
unsigned sectors, congested = bch_get_congested(c);
struct task_struct *task = current;
struct io *i;
if (atomic_read(&dc->disk.detaching) ||
c->gc_stats.in_use > CUTOFF_CACHE_ADD ||
@ -536,38 +537,30 @@ static bool check_should_bypass(struct cached_dev *dc, struct bio *bio)
(bio->bi_rw & REQ_SYNC))
goto rescale;
if (dc->sequential_merge) {
struct io *i;
spin_lock(&dc->io_lock);
spin_lock(&dc->io_lock);
hlist_for_each_entry(i, iohash(dc, bio->bi_sector), hash)
if (i->last == bio->bi_sector &&
time_before(jiffies, i->jiffies))
goto found;
hlist_for_each_entry(i, iohash(dc, bio->bi_sector), hash)
if (i->last == bio->bi_sector &&
time_before(jiffies, i->jiffies))
goto found;
i = list_first_entry(&dc->io_lru, struct io, lru);
i = list_first_entry(&dc->io_lru, struct io, lru);
add_sequential(task);
i->sequential = 0;
add_sequential(task);
i->sequential = 0;
found:
if (i->sequential + bio->bi_size > i->sequential)
i->sequential += bio->bi_size;
if (i->sequential + bio->bi_size > i->sequential)
i->sequential += bio->bi_size;
i->last = bio_end_sector(bio);
i->jiffies = jiffies + msecs_to_jiffies(5000);
task->sequential_io = i->sequential;
i->last = bio_end_sector(bio);
i->jiffies = jiffies + msecs_to_jiffies(5000);
task->sequential_io = i->sequential;
hlist_del(&i->hash);
hlist_add_head(&i->hash, iohash(dc, i->last));
list_move_tail(&i->lru, &dc->io_lru);
hlist_del(&i->hash);
hlist_add_head(&i->hash, iohash(dc, i->last));
list_move_tail(&i->lru, &dc->io_lru);
spin_unlock(&dc->io_lock);
} else {
task->sequential_io = bio->bi_size;
add_sequential(task);
}
spin_unlock(&dc->io_lock);
sectors = max(task->sequential_io,
task->sequential_io_avg) >> 9;

1
drivers/md/bcache/super.c
View File

@ -1079,7 +1079,6 @@ static int cached_dev_init(struct cached_dev *dc, unsigned block_size)
spin_lock_init(&dc->io_lock);
bch_cache_accounting_init(&dc->accounting, &dc->disk.cl);
dc->sequential_merge = true;
dc->sequential_cutoff = 4 << 20;
for (io = dc->io; io < dc->io + RECENT_IO; io++) {

4
drivers/md/bcache/sysfs.c
View File

@ -72,7 +72,6 @@ rw_attribute(congested_read_threshold_us);
rw_attribute(congested_write_threshold_us);
rw_attribute(sequential_cutoff);
rw_attribute(sequential_merge);
rw_attribute(data_csum);
rw_attribute(cache_mode);
rw_attribute(writeback_metadata);
@ -161,7 +160,6 @@ SHOW(__bch_cached_dev)
sysfs_hprint(stripe_size, dc->disk.stripe_size << 9);
var_printf(partial_stripes_expensive, "%u");
var_printf(sequential_merge, "%i");
var_hprint(sequential_cutoff);
var_hprint(readahead);
@ -207,7 +205,6 @@ STORE(__cached_dev)
dc->writeback_rate_p_term_inverse, 1, INT_MAX);
d_strtoul(writeback_rate_d_smooth);
d_strtoul(sequential_merge);
d_strtoi_h(sequential_cutoff);
d_strtoi_h(readahead);
@ -319,7 +316,6 @@ static struct attribute *bch_cached_dev_files[] = {
&sysfs_stripe_size,
&sysfs_partial_stripes_expensive,
&sysfs_sequential_cutoff,
&sysfs_sequential_merge,
&sysfs_clear_stats,
&sysfs_running,
&sysfs_state,