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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-16096] ResourceId constructors use operator% where they should use operator&amp; for bit masking</title>
                <link>https://jira.mongodb.org/browse/SERVER-16096</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The ResourceId constructors hash a resource name and then compute that value modulo &lt;tt&gt;0x1fffffffffffffffULL&lt;/tt&gt;.  The author almost certainly meant to mask off the high order 3 bits, which is achieved by taking the bitwise and (operator&amp;amp;) rather than the unsigned integer modulus (operator%).  Since operator% with this constant requires integer division, it is computationally far more expensive than necessary, but it may not be affecting the correctness of operation.&lt;/p&gt;

&lt;p&gt;ResourceId should probably be rewritten entirely in terms of bit masking, instead of a mix of bit masking and narrow bit field structures.&lt;/p&gt;</description>
                <environment></environment>
        <key id="168616">SERVER-16096</key>
            <summary>ResourceId constructors use operator% where they should use operator&amp; for bit masking</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="9">Done</resolution>
                                        <assignee username="geert.bosch@mongodb.com">Geert Bosch</assignee>
                                    <reporter username="schwerin@mongodb.com">Andy Schwerin</reporter>
                        <labels>
                    </labels>
                <created>Tue, 11 Nov 2014 20:50:49 +0000</created>
                <updated>Mon, 24 Nov 2014 15:00:11 +0000</updated>
                            <resolved>Fri, 14 Nov 2014 21:39:52 +0000</resolved>
                                    <version>2.8.0-rc0</version>
                                    <fixVersion>2.8.0-rc1</fixVersion>
                                    <component>Concurrency</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="764893" author="xgen-internal-githook" created="Fri, 14 Nov 2014 21:37:03 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;GeertBosch&apos;, u&apos;name&apos;: u&apos;Geert Bosch&apos;, u&apos;email&apos;: u&apos;geert@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-16096&quot; title=&quot;ResourceId constructors use operator% where they should use operator&amp;amp; for bit masking&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-16096&quot;&gt;&lt;del&gt;SERVER-16096&lt;/del&gt;&lt;/a&gt;: Fix UINT64_MAX build issue&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/9a0cb0d0ba72bc499c1761487422b72904e951a7&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/9a0cb0d0ba72bc499c1761487422b72904e951a7&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="764822" author="xgen-internal-githook" created="Fri, 14 Nov 2014 20:43:47 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;GeertBosch&apos;, u&apos;name&apos;: u&apos;Geert Bosch&apos;, u&apos;email&apos;: u&apos;geert@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-16096&quot; title=&quot;ResourceId constructors use operator% where they should use operator&amp;amp; for bit masking&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-16096&quot;&gt;&lt;del&gt;SERVER-16096&lt;/del&gt;&lt;/a&gt;: Use explicit masking in ResourceId instead of union/bitfields&lt;/p&gt;

&lt;p&gt;Also pass ResourceId by value instead of by reference and use static const for&lt;br/&gt;
_numLockBuckets to avoid division.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/78923a5dd969e9b9f46d3fe9bdd969ab0d0a3ca2&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/78923a5dd969e9b9f46d3fe9bdd969ab0d0a3ca2&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="764820" author="xgen-internal-githook" created="Fri, 14 Nov 2014 20:43:46 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;GeertBosch&apos;, u&apos;name&apos;: u&apos;Geert Bosch&apos;, u&apos;email&apos;: u&apos;geert@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-16096&quot; title=&quot;ResourceId constructors use operator% where they should use operator&amp;amp; for bit masking&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-16096&quot;&gt;&lt;del&gt;SERVER-16096&lt;/del&gt;&lt;/a&gt;: Add test case for locker perf&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/3d754a25fb3a14c4ddd47b5257b86e775fb17091&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/3d754a25fb3a14c4ddd47b5257b86e775fb17091&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="762933" author="geert.bosch" created="Wed, 12 Nov 2014 23:13:15 +0000"  >&lt;p&gt;I just noticed this while making some unrelated changes to the lock manager.&lt;br/&gt;
Will fix.&lt;/p&gt;</comment>
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