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ceph: add dentry lease metric support

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For dentry leases, only count the hit/miss info triggered from the vfs
calls. For the cases like request reply handling and ceph_trim_dentries,
ignore them.

For now, these are only viewable using debugfs. Future patches will
allow the client to send the stats to the MDS.

The output looks like:

item          total           miss            hit
-------------------------------------------------
d_lease       11              7               141

URL: https://tracker.ceph.com/issues/43215
Signed-off-by: Xiubo Li <xiubli@redhat.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
This commit is contained in:
Xiubo Li 2020-03-19 23:44:59 -04:00 • committed by Ilya Dryomov
parent 3d77e6a880
commit f9009efac4
8 changed files with 113 additions and 7 deletions
Download patch file Download diff file Expand all files Collapse all files

33
fs/ceph/debugfs.c
View file

@ -124,6 +124,23 @@ static int mdsc_show(struct seq_file *s, void *p)
return 0;
}
static int metric_show(struct seq_file *s, void *p)
{
struct ceph_fs_client *fsc = s->private;
struct ceph_mds_client *mdsc = fsc->mdsc;
struct ceph_client_metric *m = &mdsc->metric;
seq_printf(s, "item total miss hit\n");
seq_printf(s, "-------------------------------------------------\n");
seq_printf(s, "%-14s%-16lld%-16lld%lld\n", "d_lease",
atomic64_read(&m->total_dentries),
percpu_counter_sum(&m->d_lease_mis),
percpu_counter_sum(&m->d_lease_hit));
return 0;
}
static int caps_show_cb(struct inode *inode, struct ceph_cap *cap, void *p)
{
struct seq_file *s = p;
@ -222,6 +239,7 @@ DEFINE_SHOW_ATTRIBUTE(mdsmap);
DEFINE_SHOW_ATTRIBUTE(mdsc);
DEFINE_SHOW_ATTRIBUTE(caps);
DEFINE_SHOW_ATTRIBUTE(mds_sessions);
DEFINE_SHOW_ATTRIBUTE(metric);
/*
@ -255,6 +273,7 @@ void ceph_fs_debugfs_cleanup(struct ceph_fs_client *fsc)
debugfs_remove(fsc->debugfs_mdsmap);
debugfs_remove(fsc->debugfs_mds_sessions);
debugfs_remove(fsc->debugfs_caps);
debugfs_remove(fsc->debugfs_metric);
debugfs_remove(fsc->debugfs_mdsc);
}
@ -295,11 +314,17 @@ void ceph_fs_debugfs_init(struct ceph_fs_client *fsc)
fsc,
&mdsc_fops);
fsc->debugfs_metric = debugfs_create_file("metrics",
0400,
fsc->client->debugfs_dir,
fsc,
&metric_fops);
fsc->debugfs_caps = debugfs_create_file("caps",
0400,
fsc->client->debugfs_dir,
fsc,
&caps_fops);
0400,
fsc->client->debugfs_dir,
fsc,
&caps_fops);
}