MFC SVN r329188,329334,329353,329914,329995-329996: DTrace Enhancements

r329188: Use tabs in io.d, fix alignment issues, remove extra newlines
r329334: Add errno definitions to /usr/lib/dtrace/errno.d
r329353: Add inline to errno.d for translating int to string
r329914: Updates and enhancements to io.d to aid DTrace scripting
r329995: Updates and enhancements to signal.d to aid DTrace scripting
r329996: Consistent casing for fallback SIGCHLD (s/Unknown/unknown/)

MFC SVN r330559-330560,330672,332865-332867,333513-333519: dwatch(1)

r330559: Introduce dwatch(1) as a tool for making DTrace more useful
r330560: Bump dwatch(1) internal version from 1.0-beta-91 to 1.0
r330672: Fix display of wrong pid from dtrace_sched(4)
r332865: Add `-dev' option to aid debugging of profiles
r332866: Add profile for send(2)/recv(2) syscalls
r332867: Remove the line used to demonstrate `-dev' option
r333513: Bugfix, usage displayed with `-1Q'
r333514: Separate default values so `-[BK] num' don't affect usage
r333515: Simplify info message test
r333516: Export ARGV to profiles loaded via load_profile()
r333517: Allow `-E code' to override profile EVENT_DETAILS
r333518: Expose process for ip/tcp/udp
r333519: Refactor sendrecv profile

Reviewed by: markj, gnn, bdrewery (head; earlier version)
Approved by: re (gjb)
Relnotes: yes
Sponsored by: Smule, Inc.
Differential Revision: https://reviews.freebsd.org/D15418

MFC r305363:
Remove redefinitions of some kernel types from mbuf.d.

Copy head@r302406 to stable/11 as part of the 11.0-RELEASE cycle.
Prune svn:mergeinfo from the new branch, as nothing has been merged
here.

Additional commits post-branch will follow.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Remove the old version of the DTraceToolkit from the source tree.
The DTraceToolkit is part of the Open DTrace effort and is supported
on FreeBSD as a port (sysutils/DTraceToolkit) which has been updated
to properly track toolkit development upstream.

Sponsored by: DARPA, AFRL

Add the address at which the routine returned.

MFC after: 1 week
Sponsored by: Rubicon Communications (Netgate)

Remove dependency on mbuf provider as mbuf SDTs are now in the SDT space.

Sponsored by: Rubicon Communications (Netgate)

Add an mbuf provider to DTrace.

The mbuf provider is made up of a set of Statically Defined Tracepoints
which help us look into mbufs as they are allocated and freed. This can be
used to inspect the buffers or for a simplified mbuf leak detector.

New tracepoints are:

mbuf:::m-init
mbuf:::m-gethdr
mbuf:::m-get
mbuf:::m-getcl
mbuf:::m-clget
mbuf:::m-cljget
mbuf:::m-cljset
mbuf:::m-free
mbuf:::m-freem

There is also a translator for mbufs which gives some visibility into the structure,
see mbuf.d for more details.

Reviewed by: bz, markj
MFC after: 2 weeks
Sponsored by: Rubicon Communications (Netgate)
Differential Revision: https://reviews.freebsd.org/D5682

fix tcpdebug: - assign to "flags" in each probe, not only debug-input
compute "len" in the same way in each probe

Submitted by: Hannes Mehnert
MFC after: 2 weeks
Differential Revision: https://reviews.freebsd.org/D5524

Bump copyright for change from fbt to syscall

MFC after: 3 days
X-MFC-to: stable/10
X-MFC-with: r294548 r294556

Switch to syscall; HEAD lacks fbt for kill(2)

MFC after: 3 days
X-MFC-to: stable/10
X-MFC-with: 294548

Fix bad title on script (caused by copy/paste)

MFC after: 3 days
X-MFC-to: stable/10
X-MFC-with: r294548

Add scripts for watching common entry points.

MFC after: 3 days
X-MFC-to: stable/10

META MODE: Update dependencies with 'the-lot' and add missing directories.

This is not properly respecting WITHOUT or ARCH dependencies in target/.
Doing so requires a massive effort to rework targets/ to do so. A
better approach will be to either include the SUBDIR Makefiles directly
and map to DIRDEPS or just dynamically lookup the SUBDIR. These lose
the benefit of having a userland/lib, userland/libexec, etc, though and
results in a massive package. The current implementation of targets/ is
very unmaintainable.

Currently rescue/rescue and sys/modules are still not connected.

Sponsored by: EMC / Isilon Storage Division

META MODE: These need object directories to handle staging.

Sponsored by: EMC / Isilon Storage Division

Replace the retval.sh shell script with a native DTrace script.

Suggested by: markj

Summary: A simple script to print the return value of any function,
with or without wild cards.

Add a little, but very useful script for use with programs that work using an
event loop and should sleep only when waiting for events (eg. via kevent(2)).
When a program is going to sleep in the kernel, the script will show its name,
PID, kernel stack trace and userland stack trace. Sleeping in kevent(2) is
ignored as it is expected to be valid.

Sample output:

# ./blocking lynxd

lynxd(15042) is blocking...

kernel`_cv_wait_sig+0x124
kernel`seltdwait+0xae
kernel`sys_poll+0x3a3
kernel`amd64_syscall+0x343
kernel`0xffffffff806c79ab

lynxd`poll+0xa
lynxd`pqSocketCheck+0xa2
lynxd`pqWaitTimed+0x29
lynxd`connectDBComplete+0xd7
lynxd`PQsetdbLogin+0x2ec
lynxd`db_connect+0x3c
lynxd`main+0x198
lynxd`_start+0x16f
0x2

lynxd(1925) is blocking...

kernel`_cv_wait+0x125
zfs.ko`zio_wait+0x5b
zfs.ko`dmu_buf_hold_array_by_dnode+0x1dc
zfs.ko`dmu_read+0xcb
zfs.ko`zfs_freebsd_getpages+0x37b
kernel`VOP_GETPAGES_APV+0xa7
kernel`vnode_pager_getpages+0x9a
kernel`vm_fault_hold+0x885
kernel`vm_fault+0x77
kernel`trap_pfault+0x211
kernel`trap+0x506
kernel`0xffffffff806c76c2

lynxd`EVP_add_cipher+0x13
lynxd`SSL_library_init+0x11
lynxd`main+0x94
lynxd`_start+0x16f
0x2

lynxd(1925) is blocking...

kernel`_cv_wait+0x125
zfs.ko`zio_wait+0x5b
zfs.ko`dbuf_read+0x791
zfs.ko`dbuf_findbp+0x12f
zfs.ko`dbuf_hold_impl+0xa2
zfs.ko`dbuf_hold+0x1b
zfs.ko`dmu_buf_hold_array_by_dnode+0x153
zfs.ko`dmu_read_uio+0x66
zfs.ko`zfs_freebsd_read+0x3a3
kernel`VOP_READ_APV+0xa1
kernel`vn_read+0x13a
kernel`vn_io_fault+0x10b
kernel`dofileread+0x95
kernel`kern_readv+0x68
kernel`sys_read+0x63
kernel`amd64_syscall+0x343
kernel`0xffffffff806c79ab

lynxd`_read+0xa
lynxd`__srefill+0x122
lynxd`fgets+0x78
lynxd`file_gets+0x1d
lynxd`BIO_gets+0x64
lynxd`PEM_read_bio+0xf5
lynxd`PEM_X509_INFO_read_bio+0x90
lynxd`X509_load_cert_crl_file+0x47
lynxd`by_file_ctrl+0x2e
lynxd`X509_STORE_load_locations+0x4a
lynxd`sslctx_init+0x255
lynxd`main+0x215
lynxd`_start+0x16f
0x2

Requested by: gnn
Obtained from: Wheel Systems http://wheelsystems.com

dd DTrace probe points, translators and a corresponding script
to provide the TCPDEBUG functionality with pure DTrace.

Reviewed by: rwatson
MFC after: 2 weeks
Sponsored by: Limelight Networks
Differential Revision: D3530

Update DTrace nfs scripts to track the proper provider names.

Submitted by: Alex Burlyga

Add missing DTrace scripts that exist in the source tree to the Makefile for
install.
While here, sort the list.

Differential Revision: D2950
Submitted by: Jason Wolfe <j at nitrology.com>
Reviewed by: gnn, markj, hiren
Sponsored by: Limelight Networks

Add META_MODE support.

Off by default, build behaves normally.
WITH_META_MODE we get auto objdir creation, the ability to
start build from anywhere in the tree.

Still need to add real targets under targets/ to build packages.

Differential Revision: D2796
Reviewed by: brooks imp

Remove NO_OBJ

For meta mode we will want objdirs.

Differential Revision: D2748
Reviewed by: brooks imp

Brief demo script showing the various values that can be read via the new SIFTR statically defined tracepoint (SDT).

Reviewed by: bz, markj

Summary: Update the ports to read from the packet rather than the
socket structure

udp track shows UDP data as it arrives and leaves the system

Summary: Remove the pid printing which does not currently work.

Set the property to executable.

Add execute bits to tcpstate script.

TCP connection tracker that uses aggregations to show where connections
originate from.

Add a more complex TCP tracking script, which shows connections and
accepts as well as state transitions.

Add a TCP state tracking script based on FreeBSD TCP SDTs

add my scripts to measure io latency per disk...

make the README a bit more clearer...

Sort the scripts, and remove the trailing backslash...

We really should install more of the toolkit scripts than just 5 of them..

Use dtrace -s instead of /bin/sh for DTrace scripts.

Use src.opts.mk in preference to bsd.own.mk except where we need stuff
from the latter.

Remove copy/pasteo in the copyright notice.

Add a new script, hotopen, which shows what uid is opening files
on a per second basis. While here clean up the Makefile as well.

MFC after: 1 week

Add a script that traces NFS attribute cache accesses.

Submitted by: rwatson
MFC after: 2 weeks

Fix a case typo.

Pointed out by: jlh@

Add a DTrace script to show the frequency and latency of NFS client calls.

Submitted by: rwatson

Add support for our own DTrace scripts and those from the DTraceToolkit
to the build system. FreeBSD written scripts are stored in
src/share and the toolkit scripts are brought from the cddl directory
into a working tree via install.

MFC after: 2 weeks