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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-46024] Collect /proc/vmstat swap statistics in FTDC</title>
                <link>https://jira.mongodb.org/browse/SERVER-46024</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;FTDC currently collects page faults and disk activity, however determining the status of actual swap activity is difficult from just these metrics.&lt;/p&gt;

&lt;p&gt;The addition of pswpin and pswpout should cover this activity.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1136788">SERVER-46024</key>
            <summary>Collect /proc/vmstat swap statistics in FTDC</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="mark.benvenuto@mongodb.com">Mark Benvenuto</assignee>
                                    <reporter username="kevin.arhelger@mongodb.com">Kevin Arhelger</reporter>
                        <labels>
                    </labels>
                <created>Thu, 6 Feb 2020 23:45:09 +0000</created>
                <updated>Sun, 29 Oct 2023 22:12:26 +0000</updated>
                            <resolved>Wed, 18 Mar 2020 14:21:27 +0000</resolved>
                                                    <fixVersion>4.2.6</fixVersion>
                    <fixVersion>3.6.18</fixVersion>
                    <fixVersion>4.4.0-rc0</fixVersion>
                    <fixVersion>4.0.18</fixVersion>
                    <fixVersion>4.7.0</fixVersion>
                                    <component>Diagnostics</component>
                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="2996544" author="xgen-internal-githook" created="Wed, 25 Mar 2020 15:49:53 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;mark.benvenuto@mongodb.com&apos;, &apos;name&apos;: &apos;Mark Benvenuto&apos;, &apos;username&apos;: &apos;markbenvenuto&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-46024&quot; title=&quot;Collect /proc/vmstat swap statistics in FTDC&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-46024&quot;&gt;&lt;del&gt;SERVER-46024&lt;/del&gt;&lt;/a&gt; Collect /proc/vmstat swap statistics in FTDC&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 97e0731610f18576229c322c3a4186202c77c521)&lt;br/&gt;
Branch: v4.2&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/75522da039c1d869fa84800b6770164168c10abc&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/75522da039c1d869fa84800b6770164168c10abc&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2988612" author="xgen-internal-githook" created="Fri, 20 Mar 2020 00:57:49 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Mark Benvenuto&apos;, &apos;username&apos;: &apos;markbenvenuto&apos;, &apos;email&apos;: &apos;mark.benvenuto@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-46024&quot; title=&quot;Collect /proc/vmstat swap statistics in FTDC&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-46024&quot;&gt;&lt;del&gt;SERVER-46024&lt;/del&gt;&lt;/a&gt; Collect /proc/vmstat swap statistics in FTDC&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 97e0731610f18576229c322c3a4186202c77c521)&lt;br/&gt;
Branch: v3.6&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/0e6cad944ce21880dce7616677669d089932f7fc&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/0e6cad944ce21880dce7616677669d089932f7fc&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2987831" author="xgen-internal-githook" created="Thu, 19 Mar 2020 17:24:10 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;mark.benvenuto@mongodb.com&apos;, &apos;name&apos;: &apos;Mark Benvenuto&apos;, &apos;username&apos;: &apos;markbenvenuto&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-46024&quot; title=&quot;Collect /proc/vmstat swap statistics in FTDC&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-46024&quot;&gt;&lt;del&gt;SERVER-46024&lt;/del&gt;&lt;/a&gt; Collect /proc/vmstat swap statistics in FTDC&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 97e0731610f18576229c322c3a4186202c77c521)&lt;br/&gt;
Branch: v4.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/997a51ce1592e3f048858b128a525e97f03407ea&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/997a51ce1592e3f048858b128a525e97f03407ea&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2985195" author="xgen-internal-githook" created="Wed, 18 Mar 2020 15:46:20 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Mark Benvenuto&apos;, &apos;username&apos;: &apos;markbenvenuto&apos;, &apos;email&apos;: &apos;mark.benvenuto@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-46024&quot; title=&quot;Collect /proc/vmstat swap statistics in FTDC&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-46024&quot;&gt;&lt;del&gt;SERVER-46024&lt;/del&gt;&lt;/a&gt; Collect /proc/vmstat swap statistics in FTDC&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 97e0731610f18576229c322c3a4186202c77c521)&lt;br/&gt;
Branch: v4.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/9d64859de2e271885f448838146d01a6d428431f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/9d64859de2e271885f448838146d01a6d428431f&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2983791" author="xgen-internal-githook" created="Tue, 17 Mar 2020 18:42:45 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Mark Benvenuto&apos;, &apos;username&apos;: &apos;markbenvenuto&apos;, &apos;email&apos;: &apos;mark.benvenuto@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-46024&quot; title=&quot;Collect /proc/vmstat swap statistics in FTDC&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-46024&quot;&gt;&lt;del&gt;SERVER-46024&lt;/del&gt;&lt;/a&gt; Collect /proc/vmstat swap statistics in FTDC&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/97e0731610f18576229c322c3a4186202c77c521&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/97e0731610f18576229c322c3a4186202c77c521&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2968144" author="mark.benvenuto" created="Wed, 11 Mar 2020 17:09:45 +0000"  >&lt;p&gt;Yes, you are correct. The &lt;tt&gt;pgmajfault&lt;/tt&gt; counter faults that require reading from disk and &lt;tt&gt;pgfault&lt;/tt&gt; is all faults (aka &quot;soft&quot; or &quot;minor&quot;). I will add the &lt;tt&gt;pgfault&lt;/tt&gt; counter.&lt;/p&gt;</comment>
                            <comment id="2968063" author="bruce.lucas@10gen.com" created="Wed, 11 Mar 2020 16:53:16 +0000"  >&lt;p&gt;Is the difference between pgmajfault and pgfault that the latter includes &quot;soft&quot; or &quot;minor&quot; page faults used to implement on-demand memory allocation? If so this might be interesting because I&apos;ve at times suspected that a high rate of minor page faults due to allocator commit/decommit churn was responsible for some performance issues.&lt;/p&gt;</comment>
                            <comment id="2962578" author="mark.benvenuto" created="Wed, 11 Mar 2020 00:02:16 +0000"  >&lt;p&gt;I would also include &lt;tt&gt;nr_mlock&lt;/tt&gt;.&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=bruce.lucas&quot; class=&quot;user-hover&quot; rel=&quot;bruce.lucas&quot;&gt;bruce.lucas&lt;/a&gt;, what are your thoughts? In summary,&#160;&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;pswpin&lt;/li&gt;
	&lt;li&gt;pswpout&lt;/li&gt;
	&lt;li&gt;pgmajfault&lt;/li&gt;
	&lt;li&gt;nr_mlock&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Are the counters I am planning on including.&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;&lt;ins&gt;References&lt;/ins&gt;&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://elixir.bootlin.com/linux/latest/source/include/linux/vm_event_item.h#L25&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://elixir.bootlin.com/linux/latest/source/include/linux/vm_event_item.h#L25&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://lists.gt.net/linux/kernel/1131720&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://lists.gt.net/linux/kernel/1131720&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2962525" author="mark.benvenuto" created="Tue, 10 Mar 2020 23:38:55 +0000"  >&lt;p&gt;Should we also include &lt;tt&gt;pgmajfault&lt;/tt&gt;&#160;for major page faults? I could not find any counters that really stand out: &lt;tt&gt;pgfault&lt;/tt&gt; is all page faults which is not interesting.&lt;/p&gt;</comment>
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