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POHow do I account for all of the memory in meminfo?
 

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  1. POHow do I account for all of the memory in meminfo?
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    <p>I'm trying to understand how <code>meminfo</code> tracks memory. Here's what I'm looking at:</p> <pre><code>MemTotal: 341596 kB MemFree: 147288 kB Buffers: 56 kB Cached: 46752 kB SwapCached: 0 kB Active: 86928 kB Inactive: 41384 kB Active(anon): 81532 kB Inactive(anon): 288 kB Active(file): 5396 kB Inactive(file): 41096 kB Unevictable: 0 kB Mlocked: 0 kB SwapTotal: 0 kB SwapFree: 0 kB Dirty: 0 kB Writeback: 0 kB AnonPages: 81532 kB Mapped: 87648 kB Shmem: 316 kB Slab: 11568 kB SReclaimable: 2580 kB SUnreclaim: 8988 kB KernelStack: 3232 kB PageTables: 5480 kB NFS_Unstable: 0 kB Bounce: 0 kB WritebackTmp: 0 kB CommitLimit: 170796 kB Committed_AS: 2692436 kB VmallocTotal: 327680 kB VmallocUsed: 59244 kB VmallocChunk: 259076 kB </code></pre> <p>Here are my questions:</p> <p>1) How can I account for all 341596kB of memory? Clearly 147288 are free. How can I account for the remaining memory? (short of writing a problem to solve the zero-subset-sum problem, I mean...)</p> <p>2) Total inactive/active file memory is 46492, but <code>Mapped</code> is 87648. But, according to the <a href="http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=blob;f=Documentation/filesystems/proc.txt;hb=HEAD#l451" rel="nofollow noreferrer">manual</a>, it's</p> <pre><code>Mapped: files which have been mmaped, such as libraries </code></pre> <p>so.. how could there be more pages devoted to mapped files than there are files themselves?</p> <p><strong>Due diligence</strong> I've seen other <a href="https://stackoverflow.com/questions/658411/entries-in-proc-meminfo">posts</a> on SO related to this subject, but none that explains how to account for all the "used" memory here... Also, I've found the <a href="http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=blob;f=Documentation/filesystems/proc.txt;hb=HEAD#l451" rel="nofollow noreferrer">Linux Kernel file</a> explaining <code>/proc/meminfo</code> -- it just doesn't seem to have the complete information I want.</p>
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    1. USRobert Martin
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    1. COThis should probably be on the Unix/Linux StackExchange.
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      1. USPaul Tomblin
 

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