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    <language>en-us</language>    <build-info>
        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-85883] Allow extending arbitrary types with partitioned counters</title>
                <link>https://jira.mongodb.org/browse/SERVER-85883</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Create &lt;tt&gt;CounterHolder&lt;/tt&gt;, a new type that holds a collection of partitioned counters:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;A derived type (i.e. &lt;tt&gt;ServiceContext&lt;/tt&gt;) must extend &lt;tt&gt;CounterHolder&lt;/tt&gt;, highlighting that it can be augmented with partitioned counters.&lt;/li&gt;
	&lt;li&gt;Counters can then be added to the derived type using a new API, which is very similar to that used for declaring decorations.&lt;/li&gt;
	&lt;li&gt;For simplicity, all counters are the same type (64-bit unsigned integer) and are initialized at zero.&lt;/li&gt;
	&lt;li&gt;The declared counters will be partitioned based on the number of virtual cores, which is decided at runtime, and packed into as few cache-lines as possible.&lt;/li&gt;
	&lt;li&gt;Counters can be defined in any compilation unit, however, their lifetime is bound to the parent object (e.g. &lt;tt&gt;ServiceContext&lt;/tt&gt;) and may be packed into the same cache-line with counters from other compilation units.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Internally, &lt;tt&gt;CounterHolder&lt;/tt&gt; uses &lt;tt&gt;Counter&lt;/tt&gt; to manage individual counters (see &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-85877&quot; title=&quot;Use restartable sequences to implement a 64-bit counter&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-85877&quot;&gt;SERVER-85877&lt;/a&gt;). Also, this is primarily designed for service-level counters (e.g. those on &lt;tt&gt;ServiceContext&lt;/tt&gt;).&lt;/p&gt;</description>
                <environment></environment>
        <key id="2560219">SERVER-85883</key>
            <summary>Allow extending arbitrary types with partitioned counters</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="3" iconUrl="https://jira.mongodb.org/images/icons/statuses/inprogress.png" description="This issue is being actively worked on at the moment by the assignee.">In Progress</status>
                    <statusCategory id="4" key="indeterminate" colorName="inprogress"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="amirsaman.memaripour@mongodb.com">Amirsaman Memaripour</assignee>
                                    <reporter username="amirsaman.memaripour@mongodb.com">Amirsaman Memaripour</reporter>
                        <labels>
                    </labels>
                <created>Mon, 29 Jan 2024 19:18:07 +0000</created>
                <updated>Mon, 5 Feb 2024 14:48:25 +0000</updated>
                                                                            <component>Internal Code</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
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