Display true memory usage using procrank
procrank is a tool commonly used by Android platform developers to find out how much memory is really being used. In fact it is so useful that I was surprised to find that versions that run on normal Linux are so conspicuous by their absence. Hence my port to Linux here.
I have tested it so far only on 64-bit x86 and 32-bit ARM, but it should work on any architecture so long as the kernel has pagemap.
For a native build:
To cross compile:
$ make CROSS_COMPILE=<your cross compile prefix>
Simply run the program (as root):
./procrank PID Vss Rss Pss Uss cmdline 1109 29072K 16388K 11296K 9600K /usr/bin/python 584 65160K 10400K 9372K 9096K /usr/bin/node ... ------ ------ ------ 78433K 65556K TOTAL RAM: 509016K total, 346780K free, 14616K buffers, 70652K cached, 1468K shmem, 14580K slab
Run "./procranc -h" to see the help screen for more options.
If you are intereted in the background, I have written a blog post on smaps and Pss at http://2net.co.uk/tutorial/procrank
Where the source files came from
This version is from Android Lollipop, which I chose in order to have support for 64-bit kernels as well as 32-bit.
The source for procrank is from $AOSP/system/extras/procrank
I had to edit procrank.c and add
The source for libpagemap is from $AOSP/system/extras/libpagemap
And the source for strlcpy is from $AOSP/bionic/libc/upstream-openbsd/lib/libc/string/strlcpy.c libpagemap