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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-20791] Disable THP via MADV_NOHUGEPAGE</title>
                <link>https://jira.mongodb.org/browse/SERVER-20791</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Calling madvise() with MADV_NOHUGEPAGE (added in Linux 2.6.38) would allow MongoDB to effectively mark regions unsuited for transparent hugepages.  On 3.15 kernels and above we can use PR_SET_THP_DISABLE to disable THP process-wide. &lt;/p&gt;

&lt;p&gt;This approach should be more effective than simply instructing users to disable THP via warnings. &lt;/p&gt;</description>
                <environment></environment>
        <key id="233256">SERVER-20791</key>
            <summary>Disable THP via MADV_NOHUGEPAGE</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="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-server-servicearch">Backlog - Service Architecture</assignee>
                                    <reporter username="achille.brighton">Achille Brighton</reporter>
                        <labels>
                    </labels>
                <created>Wed, 7 Oct 2015 09:56:09 +0000</created>
                <updated>Tue, 6 Feb 2024 15:03:32 +0000</updated>
                                                                            <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>9</watches>
                                                                                                                <comments>
                            <comment id="1403191" author="jeremyeder" created="Fri, 7 Oct 2016 18:03:43 +0000"  >&lt;p&gt;Being able to selectively disable THP on a per application basis becomes much more important in systems that may run different types of workloads (such as container platforms), where globally disabling THP may adversely affect other workloads.&lt;/p&gt;

&lt;p&gt;There are two ways:&lt;br/&gt;
madvise(MADV_DONTNEED)&lt;/p&gt;

&lt;p&gt;or wrapper-capable:&lt;br/&gt;
prctl(PR_SET_THP_DISABLE) prctl(PR_GET_THP_DISABLE)&lt;/p&gt;</comment>
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