/proc/meminfo Explained

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[color="#295200"]/proc/meminfo Explained
"Free," "buffer," "swap," "dirty." What does it all mean? If you
said, "something to do with the Summer of '68", you may need a primer
on 'meminfo'.
The entries in the /proc/meminfo can help explain what's going on with your memory usage, if you know how to read it.
Example of "cat /proc/meminfo":
[color="#ffff00"]root:        total:            used:            free:                  shared:        buffers:        cached:
Mem:          1055760384        1041887232        13873152        0        100417536         711233536
Swap:         1077501952          8540160         1068961792
                                                [color="#ffff00"]MemTotal:                1031016 kB       
MemFree:                13548 kB
MemShared:                0 kB
Buffers:                98064 kB
Cached:                        692320 kB
SwapCached:                2244 kB
Active:                        563112 kB
Inact_dirty:                309584 kB
Inact_clean:                79508 kB
Inact_target:                190440 kB
HighTotal:                130992 kB
HighFree:                1876 kB
LowTotal:                900024 kB
LowFree:                11672 kB
SwapTotal:                1052248 kB
SwapFree:                1043908 kB
Committed_AS:                332340 kB
                                               
The information comes in the form of both high-level and low-level
statistics. At the top you see a quick summary of the most common
values people would like to look at. Below you find the individual
values we will discuss. First we will discuss the high-level statistics.
High-Level Statistics

MemTotal: Total usable ram (i.e. physical ram minus a few reserved bits and the kernel binary code)

MemFree: Is sum of LowFree+HighFree (overall stat)

MemShared: 0; is here for compat reasons but always zero.

Buffers: Memory in buffer cache. mostly useless as metric nowadays

Cached: Memory in the pagecache (diskcache) minus SwapCache

SwapCache: Memory that once was swapped out, is swapped
back in but still also is in the swapfile (if memory is needed it
doesn't need to be swapped out AGAIN because it is already in the
swapfile. This saves I/O)
Detailed Level Statistics
VM Statistics
VM splits the cache pages into "active" and "inactive" memory. The
idea is that if you need memory and some cache needs to be sacrificed
for that, you take it from inactive since that's expected to be not
used. The vm checks what is used on a regular basis and moves stuff
around.
When you use memory, the CPU sets a bit in the pagetable and the VM
checks that bit occasionally, and based on that, it can move pages back
to active. And within active there's an order of "longest ago not used"
(roughly, it's a little more complex in reality). The longest-ago used
ones can get moved to inactive. Inactive is split into two in the above
kernel (2.4.18-24.8.0). Some have it three.

Active: Memory that has been used more recently and usually not reclaimed unless absolutely necessary.

Inact_dirty: Dirty means "might need writing to disk or
swap." Takes more work to free. Examples might be files that have not
been written to yet. They aren't written to memory too soon in order to
keep the I/O down. For instance, if you're writing logs, it might be
better to wait until you have a complete log ready before sending it to
disk.

Inact_clean: Assumed to be easily freeable. The kernel will try to keep some clean stuff around always to have a bit of breathing room.

Inact_target: Just a goal metric the kernel uses for
making sure there are enough inactive pages around. When exceeded, the
kernel will not do work to move pages from active to inactive. A page
can also get inactive in a few other ways, e.g. if you do a long
sequential I/O, the kernel assumes you're not going to use that memory
and makes it inactive preventively. So you can get more inactive pages
than the target because the kernel marks some cache as "more likely to
be never used" and lets it cheat in the "last used" order.
Memory Statistics

HighTotal: is the total amount of memory in the high region.
Highmem is all memory above (approx) 860MB of physical RAM. Kernel uses
indirect tricks to access the high memory region. Data cache can go in
this memory region.

LowTotal: The total amount of non-highmem memory.

LowFree: The amount of free memory of the low memory
region. This is the memory the kernel can address directly. All kernel
datastructures need to go into low memory.

SwapTotal: Total amount of physical swap memory.

SwapFree: Total amount of swap memory free.

Committed_AS: An estimate of how much RAM you would
need to make a 99.99% guarantee that there never is OOM (out of memory)
for this workload. Normally the kernel will overcommit memory. That
means, say you do a 1GB malloc, nothing happens, really. Only when you
start USING that malloc memory you will get real memory on demand, and
just as much as you use. So you sort of take a mortgage and hope the
bank doesn't go bust. Other cases might include when you mmap a file
that's shared only when you write to it and you get a private copy of
that data. While it normally is shared between processes. The
Committed_AS is a guesstimate of how much RAM/swap you would need
worst-case.
               
               
               

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