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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-64594] measure executor task stack high water mark</title>
                <link>https://jira.mongodb.org/browse/SERVER-64594</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Related to &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-64584&quot; title=&quot;Don&amp;#39;t hard-code the connection thread stack size&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-64584&quot;&gt;SERVER-64584&lt;/a&gt; but totally separate from it is an idea to install, particularly in service executor threads, some instrumentation that can give us some statistics and/or warnings on how much stack is consumed by a callback. Something like&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/5bbadc66ed462aed3cc4f5635c5003da6171c25d/src/mongo/util/stacktrace_test.cpp#L412&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/5bbadc66ed462aed3cc4f5635c5003da6171c25d/src/mongo/util/stacktrace_test.cpp#L412&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;Where we could zero-fill the lower portion of the stack memory, execute the task, and then scan to see where the run of zeros stops, which would traverse all available stack space.&lt;/p&gt;

&lt;p&gt;This technique applied naively would in practice cause the kernel to realize all the stack&apos;s virtual memory though by incurring page faults. This could be avoided by writing zeros only when the page isn&apos;t already full of zeros. We could also get fancy and ask the kernel about which pages of the stack&apos;s virtual memory are untouched to save some CPU time and VM stress (maybe via /proc/self/maps and /proc/self/pagemap). For debug builds maybe we don&apos;t care about that level of optimization though.&lt;/p&gt;
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                <environment></environment>
        <key id="2003477">SERVER-64594</key>
            <summary>measure executor task stack high water mark</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="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="billy.donahue@mongodb.com">Billy Donahue</reporter>
                        <labels>
                            <label>sa-remove-fv-backlog-22</label>
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                <created>Wed, 16 Mar 2022 21:48:40 +0000</created>
                <updated>Tue, 6 Dec 2022 00:24:29 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>2</watches>
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