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dm_stats_create_region is now assigned to DM_1_02_106 by default:
the DM_1_02_104 .exported_symbols file entry was moved into
libdm-stats.c as:
DM_EXPORT_SYMBOL(dm_stats_create_region, 1_02_104)
so delete it from .exported_symbols.DM_1_02_104.
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.
Don't do interval management and external timekeeping for stats in
dm_report: let applications handle this on their own.
Since this has not been included in a release remove it from the
library entirely and handle report timing directly inside dmsetup.
Add a function to print column headings regardless of whether they
have already been output. This will be used by dmstats to issue
periodic reminders of the column headings.
This patch removes a check for RH_HEADINGS_PRINTED from
_report_headings that prevents headings being displayed if the flag
is already set; this check is redundant since the only existing
caller (_output_as_columns()) already tests the flag before
calling the function.
Moved out from lib/display and a little documentation added.
It's tuned to LVM's requirements historically and its behaviour
might not always be what you would expect.
