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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-54685] wrong definition of MONGO_YIELD_CORE_FOR_SMT for arm64</title>
                <link>https://jira.mongodb.org/browse/SERVER-54685</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;MONGO_YIELD_CORE_FOR_SMT is defined as the yield instuction, but yield is just a nop in arm64.&lt;/p&gt;

&lt;p&gt;Using an &quot;isb&quot; instruction is a better implementation. The Instruction Synchronization Barrier will create a very small delay without taking other CPU resources, which is required while spinning on a spinlock.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1629186">SERVER-54685</key>
            <summary>wrong definition of MONGO_YIELD_CORE_FOR_SMT for arm64</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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="andrew.morrow@mongodb.com">Andrew Morrow</assignee>
                                    <reporter username="tsahee@amazon.com">Tsahi Zidenberg</reporter>
                        <labels>
                    </labels>
                <created>Sun, 21 Feb 2021 09:07:14 +0000</created>
                <updated>Sun, 29 Oct 2023 21:57:13 +0000</updated>
                            <resolved>Wed, 24 Feb 2021 15:57:12 +0000</resolved>
                                                    <fixVersion>4.9.0</fixVersion>
                    <fixVersion>4.2.13</fixVersion>
                    <fixVersion>4.4.5</fixVersion>
                                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="3637457" author="xgen-internal-githook" created="Fri, 26 Feb 2021 17:42:33 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Andrew Morrow&apos;, &apos;email&apos;: &apos;acm@mongodb.com&apos;, &apos;username&apos;: &apos;acmorrow&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-54685&quot; title=&quot;wrong definition of MONGO_YIELD_CORE_FOR_SMT for arm64&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-54685&quot;&gt;&lt;del&gt;SERVER-54685&lt;/del&gt;&lt;/a&gt; Replace the ARM yield instruction with isb&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 6979525674af67405984c58585766dd4d0c3f2a8)&lt;br/&gt;
(cherry picked from commit 82a03739b80bf1873ec620165a1d8cfea2edd46f)&lt;br/&gt;
Branch: v4.2&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/a64233e90499f6e3d94c21fbe58c91e7bd744ba1&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/a64233e90499f6e3d94c21fbe58c91e7bd744ba1&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3637089" author="xgen-internal-githook" created="Fri, 26 Feb 2021 15:27:20 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Andrew Morrow&apos;, &apos;email&apos;: &apos;acm@mongodb.com&apos;, &apos;username&apos;: &apos;acmorrow&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-54685&quot; title=&quot;wrong definition of MONGO_YIELD_CORE_FOR_SMT for arm64&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-54685&quot;&gt;&lt;del&gt;SERVER-54685&lt;/del&gt;&lt;/a&gt; Replace the ARM yield instruction with isb&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 6979525674af67405984c58585766dd4d0c3f2a8)&lt;br/&gt;
Branch: v4.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/82a03739b80bf1873ec620165a1d8cfea2edd46f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/82a03739b80bf1873ec620165a1d8cfea2edd46f&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3631758" author="xgen-internal-githook" created="Wed, 24 Feb 2021 05:12:24 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Andrew Morrow&apos;, &apos;email&apos;: &apos;acm@mongodb.com&apos;, &apos;username&apos;: &apos;acmorrow&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-54685&quot; title=&quot;wrong definition of MONGO_YIELD_CORE_FOR_SMT for arm64&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-54685&quot;&gt;&lt;del&gt;SERVER-54685&lt;/del&gt;&lt;/a&gt; Replace the ARM yield instruction with isb&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/6979525674af67405984c58585766dd4d0c3f2a8&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/6979525674af67405984c58585766dd4d0c3f2a8&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3626693" author="acm" created="Sun, 21 Feb 2021 14:12:25 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=tsahee%40amazon.com&quot; class=&quot;user-hover&quot; rel=&quot;tsahee@amazon.com&quot;&gt;tsahee@amazon.com&lt;/a&gt; - No problem, we will handle it on our side then.&lt;/p&gt;</comment>
                            <comment id="3626688" author="JIRAUSER1258318" created="Sun, 21 Feb 2021 13:38:42 +0000"  >&lt;p&gt;@acm I am not able to send PRs to mongodb. Please handle it on your side, and let me know if any questions come up.&lt;/p&gt;

&lt;p&gt;Thank you!&lt;/p&gt;</comment>
                            <comment id="3626685" author="acm" created="Sun, 21 Feb 2021 13:29:11 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=tsahee%40amazon.com&quot; class=&quot;user-hover&quot; rel=&quot;tsahee@amazon.com&quot;&gt;tsahee@amazon.com&lt;/a&gt; - Thanks for filing the ticket. I see that a very similar change was made in the WT sources in &lt;a href=&quot;https://jira.mongodb.org/browse/WT-6872&quot; title=&quot;Replace the yield instructions with an ISB&quot; class=&quot;issue-link&quot; data-issue-key=&quot;WT-6872&quot;&gt;&lt;del&gt;WT-6872&lt;/del&gt;&lt;/a&gt;, so I&apos;d be pretty comfortable making this change as well. We can either handle it on our side or if you would like to do so, a PR is welcome (please see the contributing guidelines here: &lt;a href=&quot;https://github.com/mongodb/mongo/wiki#contributing-to-mongodb&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/wiki#contributing-to-mongodb&lt;/a&gt;).&lt;/p&gt;</comment>
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