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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <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-77825] optimize Decorations that are initialized to an &quot;empty&quot; state</title>
                <link>https://jira.mongodb.org/browse/SERVER-77825</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-76788&quot; title=&quot;Elide useless constructor calls for trivially-constructible Decorations&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-76788&quot;&gt;&lt;del&gt;SERVER-76788&lt;/del&gt;&lt;/a&gt; elided constructors for trivially-constructible Decorations. That work was not as efficacious as it could have been because it turns out that only a few relevant decorations are truly trivially constructible.&lt;/p&gt;

&lt;p&gt;However, many decorations are initialized to an &quot;empty&quot; value. It&apos;s just that doing so isn&apos;t technically trivial, so we have to run a nop constructor for them. We do know that the buffer for Decorations is memset with 0-bytes. So we could invent a small wrapper type that considers the zero-filled representation to be valid and empty, and we would have no constructor work necessary for those.&lt;/p&gt;

&lt;p&gt;It&apos;s still unclear that doing this optimization would save initialization time.&lt;br/&gt;
&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-78390&quot; title=&quot;Decorable subsystem refactoring&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-78390&quot;&gt;&lt;del&gt;SERVER-78390&lt;/del&gt;&lt;/a&gt; will make this easier to work on.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2359198">SERVER-77825</key>
            <summary>optimize Decorations that are initialized to an &quot;empty&quot; state</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="6" iconUrl="https://jira.mongodb.org/images/icons/statuses/closed.png" description="The issue is considered finished, the resolution is correct. Issues which are closed can be reopened.">Closed</status>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="13201">Fixed</resolution>
                                        <assignee username="billy.donahue@mongodb.com">Billy Donahue</assignee>
                                    <reporter username="billy.donahue@mongodb.com">Billy Donahue</reporter>
                        <labels>
                    </labels>
                <created>Tue, 6 Jun 2023 03:48:36 +0000</created>
                <updated>Sun, 29 Oct 2023 21:20:26 +0000</updated>
                            <resolved>Thu, 24 Aug 2023 02:19:29 +0000</resolved>
                                                    <fixVersion>7.1.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="5655299" author="xgen-internal-githook" created="Thu, 24 Aug 2023 02:12:26 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Billy Donahue&apos;, &apos;email&apos;: &apos;billy.donahue@mongodb.com&apos;, &apos;username&apos;: &apos;BillyDonahue&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-77825&quot; title=&quot;optimize Decorations that are initialized to an &amp;quot;empty&amp;quot; state&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-77825&quot;&gt;&lt;del&gt;SERVER-77825&lt;/del&gt;&lt;/a&gt; Decoration lazy-init for nontrivial objects&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/586d02e42a9d10bb43769b62e736fe67d6dc44ca&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/586d02e42a9d10bb43769b62e736fe67d6dc44ca&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5521532" author="billy.donahue" created="Fri, 23 Jun 2023 16:04:57 +0000"  >&lt;p&gt;May or may not be achievable without &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-78390&quot; title=&quot;Decorable subsystem refactoring&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-78390&quot;&gt;&lt;del&gt;SERVER-78390&lt;/del&gt;&lt;/a&gt;. Marked as a dependency but we&apos;ll try a minimal diff first.&lt;/p&gt;</comment>
                            <comment id="5521390" author="billy.donahue" created="Fri, 23 Jun 2023 15:23:46 +0000"  >&lt;p&gt;Expediting as a speculative optimization for 7.0 release.&lt;/p&gt;</comment>
                            <comment id="5476977" author="billy.donahue" created="Tue, 6 Jun 2023 03:49:32 +0000"  >&lt;p&gt;carries on the work of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-76788&quot; title=&quot;Elide useless constructor calls for trivially-constructible Decorations&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-76788&quot;&gt;&lt;del&gt;SERVER-76788&lt;/del&gt;&lt;/a&gt;, and has the potential to multiply its effects.&lt;/p&gt;</comment>
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            <issuekey id="2458965">SERVER-81848</issuekey>
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            <issuekey id="2330945">SERVER-76788</issuekey>
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