[dpdk-dev] [PATCH v5 1/3] librte_headroom: New library for checking core/system/app load

[Thomas Monjalon]

2015-02-19 13:18, Pawel Wodkowski:
> This library provide API to measure time spend in particular parts of
> code and to calculate optimal polling time.
> 
> To calculate a those statistics application code need to be divided into
> parts (called jobs) that do something. It is up to application to decide
> what is considered a job.
> 
> Series of jobs must be surrounded with the rte_headroom_start_loop() and
> rte_headroom_finish_loop() calls. After that, jobs might be started.
> Each job must be surrounded with rte_headroom_start_job() and
> rte_headroom_finish_job() calls.
> 
> After job finishes its execution, period in which it should be called
> again is adjusted to minimize time wasted on unnecessary polls/calls.
> Adjustment is based on data provided by job itself (ex: number of
> packets it processed).
> 
> After all jobs in serie are executed fallowing statistics are updated
> and might be used by application. Statistics can be reset. Some of
> provided statistic data:
>  - total/min/max execution - time spent in executing jobs.
>  - total/min/max management - time spent outside execution area. This
> value might be used to measure overhead of scheduling jobs. This time
> also
> contains overhead of headroom library itself.
>  - number of loops that executed at least one job
>  - executed jobs
>  - time when statistics were reset.
> 
> Each job provide total/min/max execution time and execution count
> statistics.
> 
> Signed-off-by: Pawel Wodkowski <pawelx.wodkowski at intel.com>
> ---
>  config/common_bsdapp                         |   5 +
>  config/common_linuxapp                       |   5 +
>  lib/Makefile                                 |   1 +
>  lib/librte_headroom/Makefile                 |  54 +++++
>  lib/librte_headroom/rte_headroom.c           | 271 ++++++++++++++++++++++
>  lib/librte_headroom/rte_headroom.h           | 324 +++++++++++++++++++++++++++
>  lib/librte_headroom/rte_headroom_version.map |  19 ++

Please add the library in doc/api/doxy-api.conf.