Messages in this thread Patch in this message | | | From | Jens Axboe <> | Subject | [PATCH 18/19] ll_rw_blk: temporarily enable max_segments tweaking | Date | Wed, 16 May 2007 10:32:32 +0200 |
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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> --- 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 7d801cf..b085d0e 100644 --- a/block/ll_rw_blk.c +++ b/block/ll_rw_blk.c @@ -3980,7 +3980,23 @@ 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, @@ -4004,6 +4020,12 @@ 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, @@ -4015,6 +4037,7 @@ 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, }; -- 1.5.2.rc1 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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