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    <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-22271] Invalid use of MS_ASYNC in msync() call</title>
                <link>https://jira.mongodb.org/browse/SERVER-22271</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;I was taking a look through some old code momentarily today, and noticed an invalid use of msync(). I&apos;m not sure how many people are using the old V1 storage implementation these days, but worth knowing about nonetheless.&lt;/p&gt;

&lt;p&gt;mongo/src/mongo/db/storage/mmap_v1/mmap_posix.cpp:271 calls msync() with an option to use MS_ASYNC or MS_SYNC based on the &quot;bool sync&quot; parameter.&lt;/p&gt;

&lt;p&gt;Unfortunately for everyone involved, MS_ASYNC is a no-op since the late 2.6 Linux days (as background sync is always enabled). So this doesn&apos;t expedite the process of flushing. Instead, the best option (if flushing is really that necessary under the async case) is probably to spawn a thread and perform the msync(MS_SYNC) there.&lt;/p&gt;

&lt;p&gt;Cheers!&lt;/p&gt;

&lt;p&gt;&amp;#8211; Christian Hergert&lt;/p&gt;</description>
                <environment></environment>
        <key id="260127">SERVER-22271</key>
            <summary>Invalid use of MS_ASYNC in msync() call</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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="9">Done</resolution>
                                        <assignee username="kyle.suarez@mongodb.com">Kyle Suarez</assignee>
                                    <reporter username="chergert">Christian Hergert</reporter>
                        <labels>
                    </labels>
                <created>Fri, 22 Jan 2016 05:00:39 +0000</created>
                <updated>Mon, 22 Feb 2016 21:34:23 +0000</updated>
                            <resolved>Mon, 1 Feb 2016 20:48:32 +0000</resolved>
                                                    <fixVersion>3.3.2</fixVersion>
                                    <component>MMAPv1</component>
                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>12</watches>
                                                                                                                <comments>
                            <comment id="1160125" author="kyle.suarez" created="Mon, 1 Feb 2016 20:49:49 +0000"  >&lt;p&gt;Thanks again &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=chergert&quot; class=&quot;user-hover&quot; rel=&quot;chergert&quot;&gt;chergert&lt;/a&gt;!&lt;/p&gt;</comment>
                            <comment id="1160114" author="xgen-internal-githook" created="Mon, 1 Feb 2016 20:43:02 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;ksuarz&apos;, u&apos;name&apos;: u&apos;Kyle Suarez&apos;, u&apos;email&apos;: u&apos;ksuarz@gmail.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-22271&quot; title=&quot;Invalid use of MS_ASYNC in msync() call&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-22271&quot;&gt;&lt;del&gt;SERVER-22271&lt;/del&gt;&lt;/a&gt; msync() with MS_ASYNC is a no-op&lt;/p&gt;

&lt;p&gt;As of Linux 2.6.17, calling msync() with the MS_ASYNC flag neither starts I/O&lt;br/&gt;
nor marks pages dirty. See&lt;br/&gt;
&lt;a href=&quot;https://github.com/torvalds/linux/blob/d1e41ff11941784f469f17795a4d9425c2eb4b7a/mm/msync.c#L20-L29&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/torvalds/linux/blob/d1e41ff11941784f469f17795a4d9425c2eb4b7a/mm/msync.c#L20-L29&lt;/a&gt;.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/17b0d57781f5badabe7ebb63ea4aa9899d537194&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/17b0d57781f5badabe7ebb63ea4aa9899d537194&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1151144" author="ramon.fernandez" created="Fri, 22 Jan 2016 14:41:39 +0000"  >&lt;p&gt;Thanks for your report &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=chergert&quot; class=&quot;user-hover&quot; rel=&quot;chergert&quot;&gt;chergert&lt;/a&gt;, we&apos;re sending this to the storage team for evaluation.&lt;/p&gt;</comment>
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