fcgp understanding

fcgp understanding

[alad]

Hi,
     Can somone please explain in brief -- How to read fcgp ( Free coding
graphical project) for a
particular file. One such map (for mmap.c) is at --
http://fcgp.sourceforge.net/images/mm_mmap.c.png

Re: fcgp understanding

[Rusty Russell]

In message <65256A9A.002DAB65.00@sandesh.hss.hns.com> you write:
> Hi,
>      Can somone please explain in brief -- How to read fcgp ( Free coding
> graphical project) for a
> particular file. One such map (for mmap.c) is at --
> http://fcgp.sourceforge.net/images/mm_mmap.c.png

This is off-topic, but maybe one canonical answer will stop others.

	The solid line (around the top and right edges) is a C file,
labelled on the bottom left.  The dashed lines means a function,
labelled on the bottom left.  Light green functions are file-local
(static).  Red functions are exported to modules.  Dark green
functions are called through a pointer.  Other functions are blue.

	Within each function, the circles are loops, the branches are
conditional statements (if, switch, ?:).  The loops approximately
circle the code they loop around.

	So, we can see that do_munmap looks like a loop around a whole
heap of little branchy code.  Indeed, looking at the code in mm/mmap.c,
half the function is a loop.

Hope that helps,
Rusty.
--
Premature optmztion is rt of all evl. --DK