linux.git/fs/ceph/debugfs.c, branch v5.9-rc2

ceph: remove redundant initialization of variable mds

2020-08-03T09:05:28+00:00

The variable mds is being initialized with a value that is never read
and it is being updated later with a new value.  The initialization is
redundant and can be removed.

Addresses-Coverity: ("Unused value")
Signed-off-by: Colin Ian King 
Reviewed-by: Jeff Layton 
Signed-off-by: Ilya Dryomov

ceph: add global total_caps to count the mdsc's total caps number

2020-08-03T09:05:15+00:00

This will help to reduce using the global mdsc->mutex lock in many
places.

Signed-off-by: Xiubo Li 
Reviewed-by: Jeff Layton 
Signed-off-by: Ilya Dryomov

ceph: add metadata perf metric support

2020-06-01T11:22:51+00:00

Add a new "r_ended" field to struct ceph_mds_request and use that to
maintain the average latency of MDS requests.

URL: https://tracker.ceph.com/issues/43215
Signed-off-by: Xiubo Li 
Reviewed-by: Jeff Layton 
Signed-off-by: Ilya Dryomov

ceph: add read/write latency metric support

2020-06-01T11:22:51+00:00

Calculate the latency for OSD read requests. Add a new r_end_stamp
field to struct ceph_osd_request that will hold the time of that
the reply was received. Use that to calculate the RTT for each call,
and divide the sum of those by number of calls to get averate RTT.

Keep a tally of RTT for OSD writes and number of calls to track average
latency of OSD writes.

URL: https://tracker.ceph.com/issues/43215
Signed-off-by: Xiubo Li 
Reviewed-by: Jeff Layton 
Signed-off-by: Ilya Dryomov

ceph: add caps perf metric for each superblock

2020-06-01T11:22:51+00:00

Count hits and misses in the caps cache. If the client has all of
the necessary caps when a task needs references, then it's counted
as a hit. Any other situation is a miss.

URL: https://tracker.ceph.com/issues/43215
Signed-off-by: Xiubo Li 
Reviewed-by: Jeff Layton 
Signed-off-by: Ilya Dryomov

ceph: add dentry lease metric support

2020-06-01T11:22:51+00:00

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 
Reviewed-by: Jeff Layton 
Signed-off-by: Ilya Dryomov

bdi: use bdi_dev_name() to get device name

2020-05-09T22:07:39+00:00

Use the common interface bdi_dev_name() to get device name.

Signed-off-by: Yufen Yu 
Signed-off-by: Christoph Hellwig 
Reviewed-by: Greg Kroah-Hartman 
Reviewed-by: Jan Kara 
Reviewed-by: Bart Van Assche 

Add missing  include BFQ

Signed-off-by: Jens Axboe

libceph: drop CEPH_DEFINE_SHOW_FUNC

2020-03-30T10:42:40+00:00

Although CEPH_DEFINE_SHOW_FUNC is much older, it now duplicates
DEFINE_SHOW_ATTRIBUTE from linux/seq_file.h.

Signed-off-by: Ilya Dryomov 
Reviewed-by: Jeff Layton

ceph: add possible_max_rank and make the code more readable

2020-01-27T15:53:40+00:00

The m_num_mds here is actually the number for MDSs which are in
up:active status, and it will be duplicated to m_num_active_mds,
so remove it.

Add possible_max_rank to the mdsmap struct and this will be
the correctly possible largest rank boundary.

Remove the special case for one mds in __mdsmap_get_random_mds(),
because the validate mds rank may not always be 0.

Signed-off-by: Xiubo Li 
Reviewed-by: Jeff Layton 
Signed-off-by: Ilya Dryomov

ceph: show tasks waiting on caps in debugfs caps file

2019-12-09T19:55:10+00:00

Add some visibility of tasks that are waiting for caps to the "caps"
debugfs file. Display the tgid of the waiting task, inode number, and
the caps the task needs and wants.

Signed-off-by: Jeff Layton 
Reviewed-by: "Yan, Zheng" 
Signed-off-by: Ilya Dryomov