3 Commits

Author	SHA1	Message	Date
Bryn M. Reeves	2cb9794da2	libdm: add statistics groups ... Add a grouping facility to the libdm-stats library that allows the user to bind several regions together as a group. Groups may be used to aggregate data from several regions for reporting, or to select and sort among large sets of regions. A textual descriptor ("group tag") is associated with each group and is stored in the first group member's aux_data field. The tag contains the group member list and an optional alias for the group, allowing the user to assign meaningful names to groups of regions. These descriptors are parsed in @stats_list message responses and populate the resulting region and area tables with the group structure. Groups with overlapping regions are permitted but since this will result in some events being counted more than once a warning is printed in this case. Nested and overlapping groups are not currently supported and attempting to create these configurations results in error.	2016-07-05 19:53:16 +01:00
Bryn M. Reeves	82e5766062	libdm: add enum based counter and metric calls ... Add a new enum based interface for accessing counter and metric values that uses a single function for each: uint64_t dm_stats_get_counter(const struct dm_stats *dms, dm_stats_counter_t counter uint64_t region_id, uint64_t area_id); int dm_stats_get_metric(const struct dm_stats *dms, int metric, uint64_t region_id, uint64_t area_id, double *value); This simplifies the implementation of value aggregation for groups of regions. The named function interface now calls the enum interface internally so that all new functionality is available regardless of the method used to retrieve values.	2016-07-05 19:53:16 +01:00
Bryn M. Reeves	81fad9e853	libdm: add dm_bitset_parse_list() ... Add a function to parse a list of integer values and ranges into a dm_bitset representation. Individual values signify that that bit is set in the resulting mask and ranges are given as a pair of start and end values, M-N, such that M and N are the first and last members of the range (inclusive). The implementation is based on the kernel's __bitmap_parselist() that is used for cpumasks and other set configuration passed in string form from user space.	2016-07-05 19:53:16 +01:00