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raid5: sysfs entry to control worker thread number

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Add a sysfs entry to control running workqueue thread number. If
group_thread_cnt is set to 0, we will disable workqueue offload handling of
stripes.

Signed-off-by: Shaohua Li <shli@fusionio.com>
Signed-off-by: NeilBrown <neilb@suse.de>
This commit is contained in:
Shaohua Li 2013-08-27 17:50:42 +08:00 committed by NeilBrown
parent 851c30c9ba
commit b721420e87
1 changed files with 60 additions and 0 deletions
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60
drivers/md/raid5.c
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@ -5145,10 +5145,70 @@ stripe_cache_active_show(struct mddev *mddev, char *page)
static struct md_sysfs_entry
raid5_stripecache_active = __ATTR_RO(stripe_cache_active);
static ssize_t
raid5_show_group_thread_cnt(struct mddev *mddev, char *page)
{
struct r5conf *conf = mddev->private;
if (conf)
return sprintf(page, "%d\n", conf->worker_cnt_per_group);
else
return 0;
}
static int alloc_thread_groups(struct r5conf *conf, int cnt);
static ssize_t
raid5_store_group_thread_cnt(struct mddev *mddev, const char *page, size_t len)
{
struct r5conf *conf = mddev->private;
unsigned long new;
int err;
struct r5worker_group *old_groups;
int old_group_cnt;
if (len >= PAGE_SIZE)
return -EINVAL;
if (!conf)
return -ENODEV;
if (kstrtoul(page, 10, &new))
return -EINVAL;
if (new == conf->worker_cnt_per_group)
return len;
mddev_suspend(mddev);
old_groups = conf->worker_groups;
old_group_cnt = conf->worker_cnt_per_group;
conf->worker_groups = NULL;
err = alloc_thread_groups(conf, new);
if (err) {
conf->worker_groups = old_groups;
conf->worker_cnt_per_group = old_group_cnt;
} else {
if (old_groups)
kfree(old_groups[0].workers);
kfree(old_groups);
}
mddev_resume(mddev);
if (err)
return err;
return len;
}
static struct md_sysfs_entry
raid5_group_thread_cnt = __ATTR(group_thread_cnt, S_IRUGO | S_IWUSR,
raid5_show_group_thread_cnt,
raid5_store_group_thread_cnt);
static struct attribute *raid5_attrs[] = {
&raid5_stripecache_size.attr,
&raid5_stripecache_active.attr,
&raid5_preread_bypass_threshold.attr,
&raid5_group_thread_cnt.attr,
NULL,
};
static struct attribute_group raid5_attrs_group = {