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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-54770] Add /proc/meminfo MemAvailable to FTDC</title>
                <link>https://jira.mongodb.org/browse/SERVER-54770</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When analyzing low memory / out of memory situations, currently a manual calculation for available memory is needed. As the Linux page cache will attempt to consume all available memory, the MemFree statistic alone cannot be used to perform this analysis.&lt;/p&gt;

&lt;p&gt;Redhat 7 and later include a MemAvailable counter in /proc/meminfo &lt;a href=&quot;https://www.kernel.org/doc/Documentation/filesystems/proc.txt&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://www.kernel.org/doc/Documentation/filesystems/proc.txt&lt;/a&gt;&lt;/p&gt;

&lt;blockquote&gt;
&lt;p&gt;MemAvailable: An estimate of how much memory is available for starting new&lt;br/&gt;
              applications, without swapping. Calculated from MemFree,&lt;br/&gt;
              SReclaimable, the size of the file LRU lists, and the low&lt;br/&gt;
              watermarks in each zone.&lt;br/&gt;
              The estimate takes into account that the system needs some&lt;br/&gt;
              page cache to function well, and that not all reclaimable&lt;br/&gt;
              slab will be reclaimable, due to items being in use. The&lt;br/&gt;
              impact of those factors will vary from system to system.&lt;/p&gt;&lt;/blockquote&gt;

&lt;p&gt;While a close approximation of MemAvailable can be made from simply summing MemFree + Cached + Buffers. I&apos;ve found MemAvailable to be slightly more pessimistic and would be really helpful in providing a single metric for memory analysis.&lt;/p&gt;
</description>
                <environment></environment>
        <key id="1632599">SERVER-54770</key>
            <summary>Add /proc/meminfo MemAvailable to FTDC</summary>
                <type id="6" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14720&amp;avatarType=issuetype">Question</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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="mark.benvenuto@mongodb.com">Mark Benvenuto</assignee>
                                    <reporter username="kevin.arhelger@mongodb.com">Kevin Arhelger</reporter>
                        <labels>
                    </labels>
                <created>Wed, 24 Feb 2021 20:03:37 +0000</created>
                <updated>Sun, 29 Oct 2023 21:57:04 +0000</updated>
                            <resolved>Wed, 10 Mar 2021 20:56:23 +0000</resolved>
                                    <version>4.4.4</version>
                                    <fixVersion>4.9.0</fixVersion>
                    <fixVersion>4.4.5</fixVersion>
                    <fixVersion>4.0.24</fixVersion>
                    <fixVersion>4.2.14</fixVersion>
                                    <component>Diagnostics</component>
                                        <votes>3</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="3657841" author="xgen-internal-githook" created="Wed, 10 Mar 2021 20:54:42 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Mark Benvenuto&apos;, &apos;email&apos;: &apos;mark.benvenuto@mongodb.com&apos;, &apos;username&apos;: &apos;markbenvenuto&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-54770&quot; title=&quot;Add /proc/meminfo MemAvailable to FTDC&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-54770&quot;&gt;&lt;del&gt;SERVER-54770&lt;/del&gt;&lt;/a&gt; Add /proc/meminfo MemAvailable to FTDC&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 0cde744f93ba588956d13fafa9cd74b0ded9334a)&lt;br/&gt;
Branch: v4.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/39f7b1f7c7fae55184581b98d76158777a5a5a26&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/39f7b1f7c7fae55184581b98d76158777a5a5a26&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3657781" author="xgen-internal-githook" created="Wed, 10 Mar 2021 20:33:13 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Mark Benvenuto&apos;, &apos;email&apos;: &apos;mark.benvenuto@mongodb.com&apos;, &apos;username&apos;: &apos;markbenvenuto&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-54770&quot; title=&quot;Add /proc/meminfo MemAvailable to FTDC&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-54770&quot;&gt;&lt;del&gt;SERVER-54770&lt;/del&gt;&lt;/a&gt; Add /proc/meminfo MemAvailable to FTDC&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 0cde744f93ba588956d13fafa9cd74b0ded9334a)&lt;br/&gt;
Branch: v4.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/16e27da22758f0709cc6185899b181c77b9f28a4&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/16e27da22758f0709cc6185899b181c77b9f28a4&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3657768" author="xgen-internal-githook" created="Wed, 10 Mar 2021 20:28:24 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Mark Benvenuto&apos;, &apos;email&apos;: &apos;mark.benvenuto@mongodb.com&apos;, &apos;username&apos;: &apos;markbenvenuto&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-54770&quot; title=&quot;Add /proc/meminfo MemAvailable to FTDC&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-54770&quot;&gt;&lt;del&gt;SERVER-54770&lt;/del&gt;&lt;/a&gt; Add /proc/meminfo MemAvailable to FTDC&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 0cde744f93ba588956d13fafa9cd74b0ded9334a)&lt;br/&gt;
Branch: v4.2&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/6d39c7158261b7a7d1012c1a0a206b53d531f6fe&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/6d39c7158261b7a7d1012c1a0a206b53d531f6fe&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3657312" author="mark.benvenuto" created="Wed, 10 Mar 2021 17:32:05 +0000"  >&lt;p&gt;Yes, I created the backports to 4.0, 4.2, and 4.4. I agree that we should not backport to 3.6.&lt;/p&gt;</comment>
                            <comment id="3657089" author="kevin.arhelger" created="Wed, 10 Mar 2021 16:27:47 +0000"  >&lt;p&gt;Thank you &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=mark.benvenuto&quot; class=&quot;user-hover&quot; rel=&quot;mark.benvenuto&quot;&gt;mark.benvenuto&lt;/a&gt; for working on this. This will greatly enhance our ability to diagnose memory issues.&lt;/p&gt;

&lt;p&gt;Would it be possible to backport this to 4.0 and later? (With the imminent end of support for 3.6 I don&apos;t think its necessary for that version).&lt;/p&gt;</comment>
                            <comment id="3656087" author="xgen-internal-githook" created="Wed, 10 Mar 2021 02:02:33 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Mark Benvenuto&apos;, &apos;email&apos;: &apos;mark.benvenuto@mongodb.com&apos;, &apos;username&apos;: &apos;markbenvenuto&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-54770&quot; title=&quot;Add /proc/meminfo MemAvailable to FTDC&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-54770&quot;&gt;&lt;del&gt;SERVER-54770&lt;/del&gt;&lt;/a&gt; Add /proc/meminfo MemAvailable to FTDC&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/0cde744f93ba588956d13fafa9cd74b0ded9334a&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/0cde744f93ba588956d13fafa9cd74b0ded9334a&lt;/a&gt;&lt;/p&gt;</comment>
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