/proc/meminfo统计信息解释

author：skate

time：2011/12/19

linux下内存的统计信息的解释：



例如 "cat /proc/meminfo":

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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