- Copy stable/10 (r259064) to releng/10.0 as part of the
10.0-RELEASE cycle.
- Update __FreeBSD_version [1]
- Set branch name to -RC1

[1] 10.0-CURRENT __FreeBSD_version value ended at '55', so
start releng/10.0 at '100' so the branch is started with
a value ending in zero.

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

Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

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

More -Wmissing-variable-declarations fixes.

In addition to adding `static' where possible:

- bin/date: Move `retval' into extern.h to make it visible to date.c.
- bin/ed: Move globally used variables into ed.h.
- sbin/camcontrol: Move `verbose' into camcontrol.h and fix shadow warnings.
- usr.bin/calendar: Remove unneeded variables.
- usr.bin/chat: Make `line' local instead of global.
- usr.bin/elfdump: Comment out unneeded function.
- usr.bin/rlogin: Use _Noreturn instead of __dead2.
- usr.bin/tset: Pull `Ospeed' into extern.h.
- usr.sbin/mfiutil: Put global variables in mfiutil.h.
- usr.sbin/pkg: Remove unused `os_corres'.
- usr.sbin/quotaon, usr.sbin/repquota: Remove unused `qfname'.

Remove spurious ARM symbols from lookup table.

MFC after: 3 days

Don't crash trying to load symbols from striped file.

PR: bin/167361
Submitted by: Slawa Olhovchenkov <slw zxy.spb.ru>
Silence from: jkoshy

Add software PMC support.

New kernel events can be added at various location for sampling or counting.
This will for example allow easy system profiling whatever the processor is
with known tools like pmcstat(8).

Simultaneous usage of software PMC and hardware PMC is possible, for example
looking at the lock acquire failure, page fault while sampling on
instructions.

Sponsored by: NETASQ
MFC after: 1 month

- Support inlined location in calltree output.
In case of multiple level of inlining all the locations are flattened.
Require recent binutils/addr2line (head works or binutils from ports
with the right $PATH order).
- Multiple fixes in the calltree output (recursion case, ...)
- Fix the calltree top view that previously hide some shared nodes.

Tested with Kcachegrind(kdesdk4)/qcachegrind(head).

Sponsored by: NETASQ

Fix base vaddr detection for ELF binaries. PT_LOAD with offset 0 is not
mandatory for ELF binaries so we'll use the segment with offset less then
alignment and align it appropriately (which covers pt_offset == 0 case)

Spelling fixes for usr.sbin/

KNF

Improve the chances of matching an outputted string with the line of code.

Add a flush of the current PMC log buffer before displaying the next top.

As the underlying block is 4KB if the PMC throughput is low the measurement
will be reported on the next tick. pmcstat(8) use the modified flush API to
reclaim current buffer before displaying next top.

MFC after: 1 month

Convert pmcstat about using cpuset_t rather than relying on plain 32 bit
ints. That fixes a first bug where pmcstat wasn't using the old
cpumask_t interface and now also brings the full support for more
than 32 cpus.

While here, make the functions pmcstat_clone_event_descriptor() and
pmcstat_get_cpumask() private to pmcstat.

The problem of assuming cpu dense masks still persists and should be
eventually fixed, as reported by avg.

Tested by: pluknet
Reviewed by: gnn
Approved by: re (kib)

When an asm location cannot be resolved to a function the cost
will be spread as small value and then filtered by the threshold.
As a first step solution display the number of event that cannot
be resolved as a valid function location.

MFC after: 1week

- Do not use the runtime mask when logfile is specified.
- Revert the fix on rtld path that is not necessary.

MFC after: 1 week

Allow file as a top source, it works with socket now.
This will allow top monitoring using socket/ssh tunnelling
of system without local symbols.

client:
pmcstat -R <ip>:<port> -T -r <symbolspath>
monitored device:
pmcstat -Sinstructions -O <ip>:<port>

- Move the file read in the event loop
- Initialize and clean log in all cases
- Preserve global stats value during top refresh
- Fix the rtld/line resolver that ignore '-r' prefix
- Support socket for '-R' (server mode)
- Display the statistics when exiting top mode

Fix warnings found by Coverity.

Found with: Coverity Prevent(tm)
MFC after: 1 month

Exclude undefined symbol from ELF file when doing function resolve.

MFC after: 3 days

Move fatal error at the right place.
Fix exit from top mode when checking if PMC is available.

MFC after: 3 days

Improve "top" header by:
- Display sample received per PMCs (or merged PMCs).
- Display percentage vs all samples

Wait for pmc name in the log before displaying data.
This will solve an abort in case of low throughput PMCs.

MFC after: 3days

Change the way shutdown is handled for log file.

pmc_flush_logfile is now non-blocking and just ask the kernel
to shutdown the file. From that point, no more data is
accepted by the log thread and when the last buffer is flushed
the file is closed.

This will remove a deadlock between pmcstat asking for
flush while it cannot flush the pipe itself.

MFC after: 3 days

- Reorganize code in 'plugin' to share log processing.
- Kcachegrind (calltree) support with assembly/source
code mapping and call count estimator (-F).
- Top mode for calltree and callgraph plugin (-T).

MFC after: 1 month

(S)LIST_HEAD_INITIALIZER takes a (S)LIST_HEAD as an argument.
Fix some wrong usages.
Note: this does not affect generated binaries as this argument is not used.

PR: 137213
Submitted by: Eygene Ryabinkin (initial version)
MFC after: 1 month

Add the -m option to pmcstat.
This option prints the list of sampled PCs along with the function name,
the start and end addresses of this where their live within.

Reviewed by: jkoshy
Tested by: gnn
Sponsored by: Nokia

Introduce pmcstat(8) changes for summarizing hwpmc(4) callchain records in
in textual form and in gmon.out format.

Update manual page.

Sponsored by: FreeBSD Foundation and Google Inc.

When printing the contents of a HWPMC log in human readable form:
- Print a warning if the version number recorded in the log is not what the
tool expects.
- Print a tidier error message when an unrecognized event is encountered
in the log.
- Don't print a spurious 'Unknown error: 0' when exiting after a parse
error.

When printing a map, print the number of samples recorded by each gmon.out file.

MFC after: 1 week

- Teach pmcstat(8) to log over the network; the -O option now
takes a host:port specification.
- Update the manual page and add an example showing how log
over the network using pmcstat(8) and nc(1). Document the
current inability to process logs in cross-platform manner.
- Have pmcstat_open_log() call err(3) directly in case
of an error; this simplifies error handling in its caller.

MFC after: 1 week

MFP4: Support for profiling dynamically loaded objects.

Kernel changes:

Inform hwpmc of executable objects brought into the system by
kldload() and mmap(), and of their removal by kldunload() and
munmap(). A helper function linker_hwpmc_list_objects() has been
added to "sys/kern/kern_linker.c" and is used by hwpmc to retrieve
the list of currently loaded kernel modules.

The unused `MAPPINGCHANGE' event has been deprecated in favour
of separate `MAP_IN' and `MAP_OUT' events; this change reduces
space wastage in the log.

Bump the hwpmc's ABI version to "2.0.00". Teach hwpmc(4) to
handle the map change callbacks.

Change the default per-cpu sample buffer size to hold
32 samples (up from 16).

Increment __FreeBSD_version.

libpmc(3) changes:

Update libpmc(3) to deal with the new events in the log file; bring
the pmclog(3) manual page in sync with the code.

pmcstat(8) changes:

Introduce new options to pmcstat(8): "-r" (root fs path), "-M"
(mapfile name), "-q"/"-v" (verbosity control). Option "-k" now
takes a kernel directory as its argument but will also work with
the older invocation syntax.

Rework string handling in pmcstat(8) to use an opaque type for
interned strings. Clean up ELF parsing code and add support for
tracking dynamic object mappings reported by a v2.0.00 hwpmc(4).

Report statistics at the end of a log conversion run depending
on the requested verbosity level.

Reviewed by: jhb, dds (kernel parts of an earlier patch)
Tested by: gallatin (earlier patch)

When generating profiles (-g) warn about shared objects that were
not found.

Handle 32 bit executables better on AMD64 platforms.

Determine where the runtime loader got mapped to when a dynamically
linked process was exec()'ed, and map samples in that address range
into the appropriate buckets in the runtime loader's profile.
Improve a few comments.

MFC after: 3 days

Fix a bug that caused generated gmon.out profiles to be out of
whack. Use saturating arithmetic when incrementing a bucket.
Improve a few comments.

MFC after: 3 days

Fix a bug that affected on-the-fly gmon.out file generation.

Approved by: re (scottl)

Unbreak tinderbox builds. Remove a debug printf.

Approved by: re (blanket hwpmc)

MFP4:

- pmcstat(8) gprof output mode fixes:

lib/libpmc/pmclog.{c,h}, sys/sys/pmclog.h:
+ Add a 'is_usermode' field to the PMCLOG_PCSAMPLE event
+ Add an 'entryaddr' field to the PMCLOG_PROCEXEC event,
so that pmcstat(8) can determine where the runtime loader
/libexec/ld-elf.so.1 is getting loaded.

sys/kern/kern_exec.c:
+ Use a local struct to group the entry address of the image being
exec()'ed and the process credential changed flag to the exec
handling hook inside hwpmc(4).

usr.sbin/pmcstat/*:
+ Support "-k kernelpath", "-D sampledir".
+ Implement the ELF bits of 'gmon.out' profile generation in a new
file "pmcstat_log.c". Move all log related functions to this
file.
+ Move local definitions and prototypes to "pmcstat.h"

- Other bug fixes:
+ lib/libpmc/pmclog.c: correctly handle EOF in pmclog_read().
+ sys/dev/hwpmc_mod.c: unconditionally log a PROCEXIT event to all
attached PMCs when a process exits.
+ sys/sys/pmc.h: correct a function prototype.
+ Improve usage checks in pmcstat(8).

Approved by: re (blanket hwpmc)