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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-60049] Investigate using AtomicLockStats over SingleThreadedLockStats in lock_state.h</title>
                <link>https://jira.mongodb.org/browse/SERVER-60049</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Operations that use the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/d22a8b46abe0bcdbcbe1c84b0e22f6b2c9dc1d87/src/mongo/db/concurrency/lock_state.h#L90&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;LockerImpl interface&lt;/a&gt; for acquiring locks are expected to call the lock/unlock methods from a single thread.&lt;/p&gt;

&lt;p&gt;A part of locking a lock involves incrementing the lock stats (_stats in lock_state.h). Single-threaded access to this data structure is not enforced as CurOp can access it concurrently for user reporting purposes.&lt;/p&gt;

&lt;p&gt;To fix TSAN build failures in this area we should investigate using &lt;tt&gt;AtomicLockStats&lt;/tt&gt; over &lt;tt&gt;SingleThreadedLockStats&lt;/tt&gt;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1877508">SERVER-60049</key>
            <summary>Investigate using AtomicLockStats over SingleThreadedLockStats in lock_state.h</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="gregory.wlodarek@mongodb.com">Gregory Wlodarek</assignee>
                                    <reporter username="gregory.wlodarek@mongodb.com">Gregory Wlodarek</reporter>
                        <labels>
                    </labels>
                <created>Fri, 17 Sep 2021 18:23:27 +0000</created>
                <updated>Sun, 29 Oct 2023 21:48:29 +0000</updated>
                            <resolved>Thu, 7 Oct 2021 15:49:23 +0000</resolved>
                                                    <fixVersion>5.2.0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="4110515" author="xgen-internal-githook" created="Thu, 7 Oct 2021 15:40:59 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Gregory Wlodarek&apos;, &apos;email&apos;: &apos;gregory.wlodarek@mongodb.com&apos;, &apos;username&apos;: &apos;GWlodarek&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-60049&quot; title=&quot;Investigate using AtomicLockStats over SingleThreadedLockStats in lock_state.h&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-60049&quot;&gt;&lt;del&gt;SERVER-60049&lt;/del&gt;&lt;/a&gt; Use AtomicLockStats over SingleThreadedLockStats in the locker&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/acdb34256ebc4c3e168fa0c546c38901b6535b19&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/acdb34256ebc4c3e168fa0c546c38901b6535b19&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4083080" author="geert.bosch" created="Fri, 24 Sep 2021 13:59:30 +0000"  >&lt;p&gt;This was quite perf sensitive code, and we move from atomics to this structure around 3.0, as it showed up as perf bottleneck. We have gotten so much slower elsewhere that it may not make a big difference anymore, or the fact that this is still effectively per thread may make atomics not a big deal, as opposed to the earlier direct updates of the same atomic objects by multiple threads.&lt;/p&gt;</comment>
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            <issuekey id="1687486">SERVER-56281</issuekey>
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