diff options
| author | Jens Axboe <jens.axboe@oracle.com> | 2007-05-10 13:29:51 +0200 |
|---|---|---|
| committer | Jens Axboe <jens.axboe@oracle.com> | 2007-10-16 11:08:53 +0200 |
| commit | 563063a808de6b2004d5b8a09ddcb6125481f4b2 (patch) | |
| tree | 03fe81595247cf8c8e6fa7cd3753be6c0229cb32 | |
| parent | 70eb8040dc81212c884a464b75e37dca8014f3ad (diff) | |
ll_rw_blk: temporarily enable max_segments tweaking
Expose this setting for now, so that users can play with enabling
large commands without defaulting it to on globally. This is a debug
patch, it will be dropped for the final versions.
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
| -rw-r--r-- | block/ll_rw_blk.c | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/block/ll_rw_blk.c b/block/ll_rw_blk.c index 36d205128f9a..527bd8d4db50 100644 --- a/block/ll_rw_blk.c +++ b/block/ll_rw_blk.c @@ -4072,7 +4072,23 @@ static ssize_t queue_max_hw_sectors_show(struct request_queue *q, char *page) return queue_var_show(max_hw_sectors_kb, (page)); } +static ssize_t queue_max_segments_show(struct request_queue *q, char *page) +{ + return queue_var_show(q->max_phys_segments, page); +} + +static ssize_t queue_max_segments_store(struct request_queue *q, + const char *page, size_t count) +{ + unsigned long segments; + ssize_t ret = queue_var_store(&segments, page, count); + spin_lock_irq(q->queue_lock); + q->max_phys_segments = segments; + spin_unlock_irq(q->queue_lock); + + return ret; +} static struct queue_sysfs_entry queue_requests_entry = { .attr = {.name = "nr_requests", .mode = S_IRUGO | S_IWUSR }, .show = queue_requests_show, @@ -4096,6 +4112,12 @@ static struct queue_sysfs_entry queue_max_hw_sectors_entry = { .show = queue_max_hw_sectors_show, }; +static struct queue_sysfs_entry queue_max_segments_entry = { + .attr = {.name = "max_segments", .mode = S_IRUGO | S_IWUSR }, + .show = queue_max_segments_show, + .store = queue_max_segments_store, +}; + static struct queue_sysfs_entry queue_iosched_entry = { .attr = {.name = "scheduler", .mode = S_IRUGO | S_IWUSR }, .show = elv_iosched_show, @@ -4107,6 +4129,7 @@ static struct attribute *default_attrs[] = { &queue_ra_entry.attr, &queue_max_hw_sectors_entry.attr, &queue_max_sectors_entry.attr, + &queue_max_segments_entry.attr, &queue_iosched_entry.attr, NULL, }; |