ceph: writeback congestion control
Set bdi congestion bit when amount of write data in flight exceeds adjustable
threshold.
Signed-off-by: Yehuda Sadeh <yehuda@hq.newdream.net>
Signed-off-by: Sage Weil <sage@newdream.net>
diff --git a/fs/ceph/debugfs.c b/fs/ceph/debugfs.c
index 441484a..22d3b47 100644
--- a/fs/ceph/debugfs.c
+++ b/fs/ceph/debugfs.c
@@ -320,6 +320,30 @@
DEFINE_SHOW_FUNC(dentry_lru_show)
DEFINE_SHOW_FUNC(caps_show)
+static int congestion_kb_set(void *data, u64 val)
+{
+ struct ceph_client *client = (struct ceph_client *)data;
+
+ if (client)
+ client->mount_args->congestion_kb = (int)val;
+
+ return 0;
+}
+
+static int congestion_kb_get(void *data, u64 *val)
+{
+ struct ceph_client *client = (struct ceph_client *)data;
+
+ if (client)
+ *val = (u64)client->mount_args->congestion_kb;
+
+ return 0;
+}
+
+
+DEFINE_SIMPLE_ATTRIBUTE(congestion_kb_fops, congestion_kb_get,
+ congestion_kb_set, "%llu\n");
+
int __init ceph_debugfs_init(void)
{
ceph_debugfs_dir = debugfs_create_dir("ceph", NULL);
@@ -409,6 +433,14 @@
if (!client->debugfs_caps)
goto out;
+ client->debugfs_congestion_kb = debugfs_create_file("writeback_congestion_kb",
+ 0600,
+ client->debugfs_dir,
+ client,
+ &congestion_kb_fops);
+ if (!client->debugfs_congestion_kb)
+ goto out;
+
sprintf(name, "../../bdi/%s", dev_name(client->sb->s_bdi->dev));
client->debugfs_bdi = debugfs_create_symlink("bdi", client->debugfs_dir,
name);
@@ -431,6 +463,7 @@
debugfs_remove(client->osdc.debugfs_file);
debugfs_remove(client->mdsc.debugfs_file);
debugfs_remove(client->monc.debugfs_file);
+ debugfs_remove(client->debugfs_congestion_kb);
debugfs_remove(client->debugfs_dir);
}