From 2baba25019ec564cd247af74013873d69a0b8190 Mon Sep 17 00:00:00 2001 From: Yehuda Sadeh Date: Fri, 18 Dec 2009 13:51:57 -0800 Subject: ceph: writeback congestion control Set bdi congestion bit when amount of write data in flight exceeds adjustable threshold. Signed-off-by: Yehuda Sadeh Signed-off-by: Sage Weil --- fs/ceph/debugfs.c | 33 +++++++++++++++++++++++++++++++++ 1 file changed, 33 insertions(+) (limited to 'fs/ceph/debugfs.c') diff --git a/fs/ceph/debugfs.c b/fs/ceph/debugfs.c index 441484ab7e94..22d3b47fb1be 100644 --- a/fs/ceph/debugfs.c +++ b/fs/ceph/debugfs.c @@ -320,6 +320,30 @@ DEFINE_SHOW_FUNC(osdc_show) 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 @@ int ceph_debugfs_client_init(struct ceph_client *client) 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 @@ void ceph_debugfs_client_cleanup(struct ceph_client *client) 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); } -- cgit v1.2.3-58-ga151