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| |
| <h1 id="statistics-module">Statistics Module</h1> |
| <p>The statistics module allows application, libraries, or drivers to |
| record statistics that can be shown via the Newtmgr tool and console.</p> |
| <p>This allows easy integration of statistics for troubleshooting, |
| maintenance, and usage monitoring.</p> |
| <p>By creating and registering your statistics, they are automatically |
| included in the Newtmgr shell and console APIs.</p> |
| <h3 id="implementation-details">Implementation Details</h3> |
| <p>A statistic is an unsigned integer that can be set by the |
| code. When building stats, the implementer chooses the size of the |
| statistic depending on the frequency of the statistic and the |
| resolution required before the counter wraps. </p> |
| <p>Typically the stats are incremented upon code events; however, they are |
| not limted to that purpose. </p> |
| <p>Stats are organized into sections. Each section of stats has its own |
| name and can be queried separately through the API. Each section of stats |
| also has its own statistic size, allowing the user to separate large (64-bit) |
| statistics from small (16 bit statistics). NOTE: It is not currently possible |
| to group different size stats into the same section. Please ensure all stats |
| in a section have the same size.</p> |
| <p>Stats sections are currently stored in a single global stats group. </p> |
| <p>Statistics are stored in a simple structure which contains a small |
| stats header followed by a list of stats. The stats header contains:</p> |
| <div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%;"><span></span><code><span style="color: #A90D91">struct</span> <span style="color: #3F6E75">stats_hdr</span> { |
| <span style="color: #A90D91">char</span> <span style="color: #000000">*s_name</span>; |
| <span style="color: #A90D91">uint8_t</span> <span style="color: #000000">s_size</span>; |
| <span style="color: #A90D91">uint8_t</span> <span style="color: #000000">s_cnt</span>; |
| <span style="color: #A90D91">uint16_t</span> <span style="color: #000000">s_pad1</span>; |
| <span style="color: #633820">#ifdef STATS_NAME_ENABLE</span> |
| <span style="color: #A90D91">struct</span> <span style="color: #3F6E75">stats_name_map</span> <span style="color: #000000">*s_map</span>; |
| <span style="color: #A90D91">int</span> <span style="color: #000000">s_map_cnt</span>; |
| <span style="color: #633820">#endif</span> |
| <span style="color: #000000">STAILQ_ENTRY</span>(<span style="color: #000000">stats_hdr</span>) <span style="color: #000000">s_next</span>; |
| }; |
| </code></pre></div> |
| |
| <p><br></p> |
| <h4 id="compile-time-options">Compile Time Options</h4> |
| <p>When building your app, there is a single compile time option for |
| statistics. When querying statistics, they are always queried by number, |
| but if you want to see the results by name, you need to define |
| <code>STATS_NAME_ENABLE</code>. This is defined using </p> |
| <div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%;"><span></span><code>pkg.clfags: -DSTATS_NAME_ENABLE |
| </code></pre></div> |
| |
| <p>in your apps pkg.yml file or </p> |
| <div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%;"><span></span><code>target.clfags: -DSTATS_NAME_ENABLE |
| </code></pre></div> |
| |
| <p>in your target definition.</p> |
| <p>Enabling stat names provides better descriptions in the reported stats, |
| but takes code space to store the strings within the image.</p> |
| <p><br></p> |
| <h3 id="adding-stats-to-your-code">Adding Stats to your code.</h3> |
| <p>Creating new stats table requires the following steps.</p> |
| <ul> |
| <li>Include the stats header file </li> |
| <li>Define a stats section</li> |
| <li>Declare an instance of the section </li> |
| <li>Define the stat sections names table</li> |
| <li>Implement stat in your code</li> |
| <li>Initialize the stats</li> |
| <li>Register the stats</li> |
| </ul> |
| <p><br></p> |
| <h4 id="include-the-stats-header-file">Include the stats header file</h4> |
| <p>Add the stats library to your pkg.yml file for your package or app by adding |
| this line to your package dependencies.</p> |
| <div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%;"><span></span><code>pkg.deps: |
| - "@apache-mynewt-core/sys/stats" |
| </code></pre></div> |
| |
| <p><br></p> |
| <p>Add this include directive to code files using the stats library.</p> |
| <div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%;"><span></span><code>#include <stats/stats.h> |
| </code></pre></div> |
| |
| <p><br></p> |
| <h4 id="define-a-stats-section">Define a stats section</h4> |
| <p>You must use the <code>stats.h</code> macros to define your stats table. A |
| stats section definition looks like this. </p> |
| <div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%;"><span></span><code>STATS_SECT_START(my_stat_section) |
| STATS_SECT_ENTRY(attempt_stat) |
| STATS_SECT_ENTRY(error_stat) |
| STATS_SECT_END |
| </code></pre></div> |
| |
| <p><br></p> |
| <p>In this case we chose to make the stats 32-bits each. <code>stats.h</code> supports three |
| different stats sizes through the following macros:</p> |
| <ul> |
| <li><code>STATS_SIZE_16</code> -- stats are 16 bits (wraps at 65536)</li> |
| <li><code>STATS_SIZE_32</code> -- stats are 32 bits (wraps at 4294967296)</li> |
| <li><code>STATS_SIZE_64</code> -- stats are 64-bits</li> |
| </ul> |
| <p>When this compiles/pre-processes, it produces a structure definition like this</p> |
| <div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%;"><span></span><code>struct stats_my_stat_section { |
| struct stats_hdr s_hdr; |
| uint32_t sattempt_stat; |
| uint32_t serror_stat; |
| }; |
| </code></pre></div> |
| |
| <p><br></p> |
| <p>You can see that the defined structure has a small stats structure |
| header and the two stats we have defined.</p> |
| <p>Depending on whether these stats are used in multiple modules, you may need |
| to include this definition in a header file.</p> |
| <p><br></p> |
| <h4 id="declaring-a-variable-to-hold-the-stats">Declaring a variable to hold the stats</h4> |
| <p>Declare the global variable to hold your statistics. Since it is possible to |
| have multiple copies of the same section (for example a stat section for |
| each of 5 identical peripherals), the variable name of the stats section |
| must be unique.</p> |
| <div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%;"><span></span><code>STATS_SECT_DECL(my_stat_section) g_mystat; |
| </code></pre></div> |
| |
| <p><br></p> |
| <p>Again, if your stats section is used in multiple C files you will need to |
| include the above definition in one of the C files and 'extern' this declaration |
| in your header file.</p> |
| <div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%;"><span></span><code>extern STATS_SECT_DECL(my_stat_section) g_mystat; |
| </code></pre></div> |
| |
| <p><br></p> |
| <h4 id="define-the-stats-section-name-table">Define the stats section name table</h4> |
| <p>Whether or not you are using <code>STATS_NAME_ENABLE</code>, you must define |
| a stats name table. If <code>STATS_NAME_ENABLE</code> is not enabled, this will |
| not take any code space or image size. </p> |
| <div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%;"><span></span><code>/* define a few stats for querying */ |
| STATS_NAME_START(my_stat_section) |
| STATS_NAME(my_stat_section, attempt_stat) |
| STATS_NAME(my_stat_section, error_stat) |
| STATS_NAME_END(my_stat_section) |
| </code></pre></div> |
| |
| <p><br></p> |
| <p>When compiled by the preprocessor, it creates a structure that looks like this.</p> |
| <div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%;"><span></span><code>struct stats_name_map g_stats_map_my_stat_section[] = { |
| { __builtin_offsetof (struct stats_my_stat_section, sattempt_stat), "attempt_stat" }, |
| { __builtin_offsetof (struct stats_my_stat_section, serror_stat), "error_stat" }, |
| }; |
| </code></pre></div> |
| |
| <p><br></p> |
| <p>This table will allow the UI components to find a nice string name for the |
| stat.</p> |
| <p><br></p> |
| <h4 id="implement-stats-in-your-code">Implement stats in your code.</h4> |
| <p>You can use the <code>STATS_INC</code> or <code>STATS_INCN</code> macros to increment your statistics |
| within your C-code. For example, your code may do this:</p> |
| <div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%;"><span></span><code> STATS_INC(g_mystat, attempt_stat); |
| rc = do_task(); |
| if(rc == ERR) { |
| STATS_INC(g_mystat, error_stat); |
| } |
| </code></pre></div> |
| |
| <p><br></p> |
| <h4 id="initialize-the-statistics">Initialize the statistics</h4> |
| <p>You must initialize the stats so they can be operated on by the stats |
| library. As per our example above, it would look like the following.</p> |
| <p>This tells the system how large each statistic is and the number of |
| statistics in the section. It also initialize the name information for |
| the statistics if enabled as shown above.</p> |
| <div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%;"><span></span><code> rc = stats_init( |
| STATS_HDR(g_mystat), |
| STATS_SIZE_INIT_PARMS(g_mystat, STATS_SIZE_32), |
| STATS_NAME_INIT_PARMS(my_stat_section)); |
| assert(rc == 0); |
| </code></pre></div> |
| |
| <p><br></p> |
| <h4 id="register-the-statistic-section">Register the statistic section</h4> |
| <p>If you want the system to know about your stats, you must register them.</p> |
| <div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%;"><span></span><code> rc = stats_register("my_stats", STATS_HDR(g_mystat)); |
| assert(rc == 0); |
| </code></pre></div> |
| |
| <p><br></p> |
| <p>There is also a method that does initialization and registration at the |
| same time, called <code>stats_init_and_reg</code>.</p> |
| <p><br></p> |
| <h3 id="retrieving-stats-through-console-or-newtmgr">Retrieving stats through console or Newtmgr</h3> |
| <p>If you enable console in your project you can see stats through the |
| serial port defined.</p> |
| <p>This is the stats as shown from the example above with names enabled.</p> |
| <div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%;"><span></span><code>stat my_stats |
| 12274:attempt_stat: 3 |
| 12275:error_stat: 0 |
| </code></pre></div> |
| |
| <p><br></p> |
| <p>This is the stats as shown from the example without names enabled.</p> |
| <div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%;"><span></span><code>stat my_stats |
| 29149:s0: 3 |
| 29150:s1: 0 |
| </code></pre></div> |
| |
| <p><br></p> |
| <h3 id="a-note-on-multiple-stats-sections">A note on multiple stats sections</h3> |
| <p>If you are implementing a device with multiple instances, you may |
| want multiple stats sections with the exact same format.</p> |
| <p>For example, suppose I write a driver for an external distance sensor. My |
| driver supports up to 5 sensors and I want to record the stats of |
| each device separately.</p> |
| <p>This works identically to the example above, except you would need to |
| register each one separately with a unique name. The stats system will |
| not let two sections be entered with the same name.</p> |
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