lkml.org 
[lkml]   [2007]   [May]   [9]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    From
    Subject[PATCH 10/10] ll_rw_blk: temporarily enable max_segments tweaking
    Date
    Expose this setting for now, so that users can play with enabling
    large commands without defaulting it to on globally.

    Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
    ---
    block/ll_rw_blk.c | 22 ++++++++++++++++++++++
    1 files changed, 22 insertions(+), 0 deletions(-)

    diff --git a/block/ll_rw_blk.c b/block/ll_rw_blk.c
    index 0ad4c34..0adcbed 100644
    --- a/block/ll_rw_blk.c
    +++ b/block/ll_rw_blk.c
    @@ -3931,7 +3931,22 @@ 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,
    @@ -3955,6 +3970,12 @@ 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,
    @@ -3966,6 +3987,7 @@ 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/

    \
     
     \ /
      Last update: 2007-05-09 10:07    [W:0.030 / U:29.640 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site