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Commit Graph

29 Commits

Author SHA1 Message Date
Bryn M. Reeves
dad02900f1 man: explain deletion of 1st group member in dmstats.8.in
Although the use of the first region_id in a group to store the
DMS_GROUP=... aux_data tag is an internal implementation detail,
it has a user visible consequence in that deleting this region will
cause the group to disappear: add an explanation of this to the
'group' command and 'Regions, areas, and groups' section.
2016-08-08 19:29:12 +01:00
Bryn M. Reeves
4bcbcdb1a2 man: minor fixes to dmstats.8.in
Remove obsolete reference to '--target'.
2016-08-08 19:07:56 +01:00
Bryn M. Reeves
74565e41fc doc: update --filemap usage in dmstats.8.in 2016-07-08 22:05:36 +01:00
Bryn M. Reeves
17cbcc85bd doc: remove obsolete --statstype references from dmstats.8.in 2016-07-08 17:27:52 +01:00
Bryn M. Reeves
6cb0c7bb5c doc: mention --segments grouping in dmstats.8.in 2016-07-08 17:27:52 +01:00
Bryn M. Reeves
c3caf4b80b doc: mention group histogram restrictions in dmstats.8.in 2016-07-08 17:27:52 +01:00
Bryn M. Reeves
d901468a27 doc: update dmstats.8.in for --filemap and --nogroup 2016-07-08 14:34:41 +01:00
Bryn M. Reeves
93034d0b69 doc: document --area, --region, and --group in dmstats.8.in 2016-07-05 19:53:17 +01:00
Bryn M. Reeves
cf0fa3d693 dmstats: rename --auxdata to --userdata 2016-07-05 19:53:17 +01:00
Bryn M. Reeves
14b74c360f dmstats: rename 'aux_data' to 'user_data'
Make it clear that the "aux data" presented in reports is the user
data stored in the field (and does not include any library-internal
state such as group descriptors) by renaming the field to user_data
and changing the heading to "UserData".
2016-07-05 19:53:17 +01:00
Bryn M. Reeves
f403ac8bf0 doc: update dmstats.8.in for groups 2016-07-05 19:53:16 +01:00
Bryn M. Reeves
f27e95b25a docs: remove obsolete note from dmstats.8.in 2016-07-04 12:16:50 +01:00
Zdenek Kabelac
867a36b419 man: update dmsetup and dmstats pages
Try to provide properly rendered pages no just with
plain 'man' but also for:

man -Tps
man -Thtml
man2html
2015-10-01 15:03:12 +02:00
Zdenek Kabelac
cfe869692f man: update man pages
Start to use 'italic' when the argument is not a fixed string.
Keep 'bold' when user cannot use any other string instead.
2015-09-22 00:08:44 +02:00
Zdenek Kabelac
11d6f81316 man: enhance dmsetup/dmstats
Document more supported options.
Cleanup man-style when documenting options.
Use .PD 0  and .HP
2015-09-18 17:45:46 +02:00
Bryn M. Reeves
cebbb0feaf dmstats: replace histogram command with switch
Replace the histogram stats subcommand with a --histogram switch
to enable histogram related fields for both list and report output.

To avoid overloading the existing --histogram rename it to --bounds:
this is also a better description of the option.
2015-09-03 23:39:11 +01:00
Bryn M. Reeves
84d88cb2cf dmstats: add --notimesuffix switch
Add a switch to disable the printing of time unit suffixes in
histogram bounds descriptions.
2015-09-03 22:04:10 +01:00
Bryn M. Reeves
b86bd3b074 man: fix typo in dmstats.8.in 2015-09-02 23:01:46 +01:00
Bryn M. Reeves
3414601788 man: document --regionid in dmstats.8.in 2015-09-02 21:03:03 +01:00
Bryn M. Reeves
d31c4e0bc1 man: update dmstats.8.in examples
Make sure that correct 'dmstats create' messages are shown for all
examples and fix LV examples to use correct dmsetup output name
format (vg/lv -> vg-lv).
2015-09-02 21:03:03 +01:00
Bryn M. Reeves
031cd2bb0d dmstats: improve stats column names
Improve the names and labels of stats reports columns, ensure that
the minimum field widths allow unambiguos labels to be shown and
update the man page descriptions of these fields.
2015-09-02 21:03:03 +01:00
Bryn M. Reeves
3c0fc6f0da dmstats: add histogram support
Add support to dmstats to create and report histograms.

Add a --histogram switch to 'create' that accepts a string
description of bin boundaries and DR_STATS and DR_STATS_META fields
to report bin configuration and absolute and relative histogram
values:

  hist_bins
  hist_bounds
  hist_ranges
  hist_count
  hist_count_bounds
  hist_count_ranges
  hist_percent
  hist_percent_bounds
  hist_percent_ranges

A new 'histogram' subcommand displays a report that emphasizes
histogram data as either counters or percentage values.
2015-09-02 21:02:12 +01:00
Bryn M. Reeves
e4145ebc47 dmstats: add --precise switch to enable nanosecond counters. 2015-08-24 20:03:21 +01:00
Bryn M. Reeves
23770214a9 man: fix program_id string in dmstats.8.in 2015-08-20 17:27:28 +01:00
Bryn M. Reeves
bc39506792 man: update dmstats.8.in examples 2015-08-18 14:40:45 +01:00
Bryn M. Reeves
f3891e90e3 dmstats: make -v enable per area reports for 'stats list'
When dmstats is run with -v or higher enable a per-area reporting
mode for statistics regions. This will output one row per area
(rather than one row per region) and adds additional fields of use
when viewing areas:

 area_id    - index within the region assigned by libdm-stats
 area_start - the start location of the area in the containing
              device.
2015-08-14 22:03:37 +01:00
Bryn M. Reeves
9b3dc72506 dmstats: add 'interval' and 'interval_ns' report fields
Add a pair of fields to expose the current per-interval duation
estimate. The 'interval' field provides a real value in units of
seconds and the 'interval_ns' field provides the same quantity
expressed as a whole number of nanoseconds.
2015-08-14 13:36:50 +01:00
Bryn M. Reeves
6b81ac5807 dmstats: replace --force with new stats-specific --alldevices
The '--force' switch is only used by dmstats to allow either
creation or deletion of one or more regions on all devices.

These operations do not carry any risk: just a possible mess of
region IDs to be cleaned up.

Remove the use of '--force' for stats commands and change current
uses to a new '--alldevices' switch.
2015-08-13 19:05:46 +01:00
Bryn M. Reeves
d62a8d2f15 dmstats: add libdm-stats library and 'dmsetup stats' command
Add the libdm-stats module to libdm: this implements a simple interface
for creating, managing and interrogating I/O statistics regions and
areas on device-mapper devices.

The library interface is documented in libdevmapper.h and provides a
'dm_stats' handle that is used to perform statistics operations and
obtain data.

Public methods are provided to create and destroy handles and to list,
create, and destroy statistics regions as well as to obtain and parse
counter data and calculate rate-based metrics.

This commit also adds a 'dmsetup stats' (aka 'dmstats') command with
'clear', 'create', 'delete', 'list', 'print', and 'report' sub-commands.

See the library documentation and the dmstats.8 manual page for detailed
API and command descriptions.
2015-08-09 14:37:58 +01:00