[psutils] Stop using zx_object_get_child(ZX_HANDLE_INVALID)

zx_object_get_child(ZX_HANDLE_INVALID) improperly allows callers to
convert any koid into a handle. Stop using it so we can delete the code
from the kernel.

Bug ZX-1702.

Change-Id: I3a7f08aee758544161ac4539c6512b6919694318

[uapp][threads] New utility to dump all threads of a process

Change-Id: I697559bbc4c12934b66814f6841c0b841ab89833

[zx] Magenta -> Zircon

The Great Renaming is here!

Change-Id: I3229bdeb2a3d0e40fb4db6fec8ca7d971fbffb94

[build][groups] annotate 'misc' and 'test' modules

This allows us to generate a bootdata.bin which excludes them,
reducing it from 4.52MB to 2.65MB

The default bootdata.bin still includes all modules.

Change-Id: If13bfcacba9386a691e6b7c380eed53d67bb44eb

[uapp][psutils] Remove --json from ps now that memgraph handles it

Update memory.md to point to memgraph

Change-Id: I54d9b27a46404fe9203d35f74cb4810b5906ce0e

[uapp][psutils] Add the 'memgraph' tool to dump task/vmo JSON

Dumps everything that 'ps --json' did, plus all of the VMOs reachable
from user processes.

This emits all of the information necessary to draw a VMO reference and
clone graph for all of userspace.

For MG-721: "Add a way to track non-mapped VMO memory usage"

Change-Id: I2ff12eec0a27053c94a5f87e9a32682c76f1fbb0

[uapp][psutils] Split out vmo-utils.cc/h

The upcoming memgraph tool needs the same logic.

Change-Id: I1b0b22eba7abfa04cf84c88a75821c1c523a8cbe

[uapp] Add the 'vmos' tool, a userspace 'k mx vmos'.

MG-818 #done

Change-Id: I484cbec43b6716dfb40b2f8336e51da70a408305

[uapp] Make 'ps --json' dump kernel memory info

Also splits out a helper function to get the root resource.

MG-819 #done

Change-Id: I29806da74289e2eb004391603af75fcdea5c68f0

[uapp] Teach kstats to dump kernel memory info

Also print the timestamp before every stat dump, both memory and CPU.

For MG-819: "Tool to print kernel memory usage"

Change-Id: I2ceedd5b72a20d97287a7ed2819d3ee8aa77fde6

[utils] add kstats utility which currently dumps per cpu statistics

Format is currently identical to the existing kernel threadstats
command.

Change-Id: I056a6c4dd61aa4c741dfddc266b24dce8c8ae4aa

[system][top] Add the first stab at a top utility

At the moment only supports printing all the threads in the system,
sorted by percentage time. A few flags exist to limit the number of
threads to display and display raw time instead of percentage.

Much of the same information collected in ps should probably be also displayed.

Change-Id: Icbc632d3db0d7c088cf74d830228aa4a725385fa

[ulib] Move psutils's size-formatter into ulib/pretty

Also make format_size() return its string arg to make
printf-chaining easier.

Change-Id: Ie330df9e3b30ea082b759084186c66629df90cf6

[ulib] Move psutil's processes.c into ulib/task-utils

- Clean up the API a little
- Call the callback on the root job, and find its koid
- Don't walk processes/threads if no callback is provided

Change-Id: Ia77cc84b5aee4ef331ec28054d36ae0aad67e5a0

[build] flatten the build

Previously we treated kernel/, system/, and third_party/ as
overlays on a shared namespace. This required the concept
of "canonical" module names, and a lot of complexity to ensure
that things didn't collide and the build worked.

This change gets rid of that, no longer passes -I to make,
so that include directives from our *.mk files do not magically
wildcard across various paths, etc.

The most user-visible change is that everywhere where a module
name is specified (MODULE_DEPS, MODULE_LIBS, etc), full module
names like kernel/lib/io or system/ulib/mxio must be used instead
of previously-allowed "short" names like lib/io and ulib/mxio.

The build output still has a similar shape, but the first segment
of the module path (kernel/, system/, or third_party/) is no
longer elided under $(BUILDDIR)

Change-Id: I525aba1da1c86eb7a86007bddc669f7eeebfedd5

[build] use '.', not '-' to add "sub-module" postfixes

Since '-' is a common feature of directory names in Magenta, it's
not possible to easily figure out if ulib/foo-bar refers to a module
named foo-bar or a module named foo with a sub-module named bar.

I want to enforce that modules *must* exist in a matching directory
(as the build expects) and that sub-modules *not* have a matching
directory (so there's never a case where we could have a collision in
the build-*/... space between a module and a sub-module.

Using a character not currently used in source directory names will
allow me to forbid its use in source directory names and ensure that
there is no ambiguity.

Change-Id: Ibf3600b33c70e6920c6c52ffc1c7139f2658034a

[uapp] New vmaps tool to dump process memory maps

Change-Id: I1cd552aa4c598029949b568f03c0f3f885508fe2

[uapp][ps] Show memory usage in ps(1)

- Use the new process VM usage fields to show memory usage.
- Sort processes before jobs at a given level to keep things
closer to their parent in the listing.
- Fancier formatting to keep columns lined up.
- Add a unit test.

Change-Id: Iddca9a485e95122814cbd2ea9402b64007895af6

[build][musl] refer to musl libc as ulib/c

This makes the build rules and the intermediate
output files easier to understand, without having
to modify the path where musl libc lives.

The biggest observeable difference is the build
intermediate files:

$ ls build-magenta-pc-x86-64/ulib/c
config-module.h libc.abi.h libc.abi.stamp libc.so libc.so.id libc.so.strip
libc.a libc.abi.o libc.a.opts libc.so.abi libc.so.opts third_party

which previously were at build-magenta-pc-x86/ulib/musl
and named libmusl.*

and the replacing of ulib/musl with ulib/c in the library
dependencies of all the rules.mk files (the vast bulk of
this change)

Change-Id: If9c5d522099d2c9ac5bdb666b8e67a2eb3d316ee

[build] fix some bad module names

These modules now end up in $(BUILDDIR)/uapp/... or udev/...
as they are supposed to.

Change-Id: I497d70cbad5edb6bd359d3abf0009e71c20fc622

[uapp][ps][kill][killall] Implement killall, unify psutils.

Combinded logic from kill and ps for job and process tree walking, then
implemented a killall on top of that.

Change-Id: I9453ce50bd6526c70d395c1dce2cd46461a7b779