Commit Graph

233 Commits

Author SHA1 Message Date
George V. Neville-Neil
2e7de50933 Add counters for the i7 architecture which were accidentally left
out of the original commit of i7 support.  These are all the counters
on pages A-32 and A-33 of the _Intel(R) 64 and IA32 Architectures
Software Developer's Manual Vol 3B_, June 2009.  Almost all
of these counters relate to operations on the L2 cache.

Reviewed by:	jkoshy
MFC after:	1 month
2009-09-01 17:55:37 +00:00
John Baldwin
21157ad3b1 Adjust the handling of the local APIC PMC interrupt vector:
- Provide lapic_disable_pmc(), lapic_enable_pmc(), and lapic_reenable_pmc()
  routines in the local APIC code that the hwpmc(4) driver can use to
  manage the local APIC PMC interrupt vector.
- Do not enable the local APIC PMC interrupt vector by default when
  HWPMC_HOOKS is enabled.  Instead, the hwpmc(4) driver explicitly
  enables the interrupt when it is succesfully initialized and disables
  the interrupt when it is unloaded.  This avoids enabling the interrupt
  on unsupported CPUs which may result in spurious NMIs.

Reported by:	rnoland
Reviewed by:	jkoshy
Approved by:	re (kib)
MFC after:	2 weeks
2009-08-14 21:05:08 +00:00
Attilio Rao
ca2d94bef7 Fix a LOR between pmc_sx and proctree/allproc when creating a new thread
for the pmclog.

Reported by:	Ryan Stone <rstone at sandvine dot com>
Tested by:	Ryan Stone <rstone at sandvine dot com>
Sponsored by:	Sandvine Incorporated
2009-06-25 20:59:37 +00:00
Jeff Roberson
597979c4b7 - Add support for nehalem/corei7 cpus. This supports all of the core
counters defined in the reference manual.  It does not support the
   'uncore' events.

Reviewed by:	jkoshy
Sponsored by:	Nokia
2009-01-27 07:29:37 +00:00
Joseph Koshy
8d8b174004 Bug fixes:
- Initialize variables before use.
- Remove a KASSERT() that could falsely trigger if there are other sources
  of NMIs in the system.

Efficiency tweak:
- When checking PMCs that overflowed, ignore PMCs that were not configured for
  sampling.
2008-12-16 11:04:02 +00:00
Joseph Koshy
1ad08c6ac1 - Disambiguate a few panic messages.
- Style fixes: wrap long lines, parenthesize return values.
2008-12-15 14:41:55 +00:00
Joseph Koshy
6fe00c7876 - Bug fix: prevent a thread from migrating between CPUs between the
time it is marked for user space callchain capture in the NMI
  handler and the time the callchain capture callback runs.

- Improve code and control flow clarity by invoking hwpmc(4)'s user
  space callchain capture callback directly from low-level code.

Reviewed by:	jhb (kern/subr_trap.c)
Testing (various patch revisions): gnn,
		Fabien Thomas <fabien dot thomas at netasq dot com>,
		Artem Belevich <artemb at gmail dot com>
2008-12-13 13:07:12 +00:00
Joseph Koshy
b4d091f3a4 Fixes for Core2 Extreme support.
Submitted by:	 "Artem Belevich" <artemb at gmail dot com>
2008-12-03 17:30:36 +00:00
Joseph Koshy
a10c6ee6bd Add aliases that map architectural event names to fixed function counters. 2008-12-03 15:23:08 +00:00
Joseph Koshy
dfd9bc23c9 - Efficiency tweak: when checking for PMC overflows, only go to
hardware for PMCs that have been configured for sampling.

- Bug fix: acknowledge PMC hardware overflows irrespective of the
  the (software) PMC's state.
2008-12-02 10:46:35 +00:00
Joseph Koshy
cb2394085d Improve a comment. 2008-11-30 05:10:14 +00:00
Joseph Koshy
0cfab8ddc1 - Add support for PMCs in Intel CPUs of Family 6, model 0xE (Core Solo
and Core Duo), models 0xF (Core2), model 0x17 (Core2Extreme) and
  model 0x1C (Atom).

  In these CPUs, the actual numbers, kinds and widths of PMCs present
  need to queried at run time.  Support for specific "architectural"
  events also needs to be queried at run time.

  Model 0xE CPUs support programmable PMCs, subsequent CPUs
  additionally support "fixed-function" counters.

- Use event names that are close to vendor documentation, taking in
  account that:
  - events with identical semantics on two or more CPUs in this family
    can have differing names in vendor documentation,
  - identical vendor event names may map to differing events across
    CPUs,
  - each type of CPU supports a different subset of measurable
    events.

  Fixed-function and programmable counters both use the same vendor
  names for events.  The use of a class name prefix ("iaf-" or
  "iap-" respectively) permits these to be distinguished.

- In libpmc, refactor pmc_name_of_event() into a public interface
  and an internal helper function, for use by log handling code.

- Minor code tweaks: staticize a global, freshen a few comments.

Tested by:	gnn
2008-11-27 09:00:47 +00:00
Jung-uk Kim
5113aa0af3 Introduce cpu_vendor_id and replace a lot of strcmp(cpu_vendor, "...").
Reviewed by:	jhb, peter (early amd64 version)
2008-11-26 19:25:13 +00:00
Joseph Koshy
c85e8dcf18 Unbreak LINT. 2008-11-22 12:34:49 +00:00
Joseph Koshy
7dada26401 Print PMC widths in the initialization announcement. 2008-11-16 04:21:59 +00:00
Joseph Koshy
bc4f0ade98 Correct an oversight: call the MD finalize hook at module unload
time.
2008-11-15 11:11:32 +00:00
Joseph Koshy
edfea6b4ad Fix assertions.
Reported by:	keramida
2008-11-15 11:07:54 +00:00
Joseph Koshy
8cd64ec8ad Correct an indexing error (a change missed out in #184802). 2008-11-15 10:56:36 +00:00
Joseph Koshy
e829eb6d61 - Separate PMC class dependent code from other kinds of machine
dependencies.  A 'struct pmc_classdep' structure describes operations
  on PMCs; 'struct pmc_mdep' contains one or more 'struct pmc_classdep'
  structures depending on the CPU in question.

  Inside PMC class dependent code, row indices are relative to the
  PMCs supported by the PMC class; MI code in "hwpmc_mod.c" translates
  global row indices before invoking class dependent operations.

- Augment the OP_GETCPUINFO request with the number of PMCs present
  in a PMC class.

- Move code common to Intel CPUs to file "hwpmc_intel.c".

- Move TSC handling to file "hwpmc_tsc.c".
2008-11-09 17:37:54 +00:00
Joseph Koshy
2ad65bf421 Style tweak. 2008-11-09 17:07:52 +00:00
John Baldwin
2ff47c5f18 Remove unnecessary locking around vn_fullpath(). The vnode lock for the
vnode in question does not need to be held.  All the data structures used
during the name lookup are protected by the global name cache lock.
Instead, the caller merely needs to ensure a reference is held on the
vnode (such as vhold()) to keep it from being freed.

In the case of procfs' <pid>/file entry, grab the process lock while we
gain a new reference (via vhold()) on p_textvp to fully close races with
execve(2).

For the kern.proc.vmmap sysctl handler, use a shared vnode lock around
the call to VOP_GETATTR() rather than an exclusive lock.

MFC after:	1 month
2008-11-04 19:04:01 +00:00
Dag-Erling Smørgrav
e11e3f187d Fix a number of style issues in the MALLOC / FREE commit. I've tried to
be careful not to fix anything that was already broken; the NFSv4 code is
particularly bad in this respect.
2008-10-23 20:26:15 +00:00
Dag-Erling Smørgrav
1ede983cc9 Retire the MALLOC and FREE macros. They are an abomination unto style(9).
MFC after:	3 months
2008-10-23 15:53:51 +00:00
Joseph Koshy
789140c0e7 - Sparsely number enumerations 'pmc_cputype' and 'pmc_event' in order to
reduce ABI disruptions when new cpu types and new PMC events are added
  in the future.
- Support alternate spellings for PMC events.  Derive the canonical
  spelling of an event name from its enumeration name in 'enum pmc_event'.
- Provide a way for users to disambiguate between identically named events
  supported by multiple classes of PMCs in a CPU.
- Change libpmc's machine-dependent event specifier parsing code to
  better support CPUs containing two or more classes of PMC resources.
2008-10-09 14:55:45 +00:00
Joseph Koshy
e7518209e7 Rework pmc-dependent flag handling. 2008-10-09 06:19:42 +00:00
Joseph Koshy
8fb796642a Correct a typo. 2008-10-06 10:34:44 +00:00
Joseph Koshy
75111b3638 Fix a typo. 2008-10-04 07:19:26 +00:00
Joseph Koshy
3d8d41b7c3 Correct misspellings. 2008-10-02 06:18:09 +00:00
Joseph Koshy
122ccdc1ca Support sparsely numbered CPUs.
Requested by:	obrien, alfred (long ago)
2008-09-22 10:37:02 +00:00
Joseph Koshy
d0d0192f83 Correct a callchain capture bug on the i386.
On the i386 architecture, the processor only saves the current value
of `%esp' on stack if a privilege switch is necessary when entering
the interrupt handler.   Thus, `frame->tf_esp' is only valid for
an entry from user mode.  For interrupts taken in kernel mode, we
need to determine the top-of-stack for the interrupted kernel
procedure by adding the appropriate offset to the current frame
pointer.

Reported by:	kris, Fabien Thomas
Tested by:	Fabien Thomas <fabien.thomas at netasq dot com>
2008-09-15 06:47:52 +00:00
Jeff Roberson
d67023a155 - Provide kernelname as the name for process with P_KTHREAD set as
otherwise their textvp is NULL.

Reviewed by:	jkoshy
Sponsored by:	Nokia
2008-07-25 05:49:48 +00:00
Adrian Chadd
05e486c71e Sign-extend the 48-bit AMD PMC counter before treating it to a 64-bit
2's compliment.

The 2's compliment transform is done so a "count down" sampling interval
can be converted into a "count up" PMC value. a 2's complimented 'count down'
value is written to the PMC counter; then the read-back counter is reverted
via another 2's compliment.

PR: kern/121660
Reviewed by: jkoshy
Approved by: jkoshy
MFC after: 1 week
2008-03-18 08:39:11 +00:00
Adrian Chadd
4dd3c84f5f Fix the debugging output - the '0x' was duplicated from the %p option. 2008-03-18 08:36:19 +00:00
Joseph Koshy
a3d7db55cc Correct a typo. 2008-03-14 06:16:18 +00:00
Attilio Rao
22db15c06f VOP_LOCK1() (and so VOP_LOCK()) and VOP_UNLOCK() are only used in
conjuction with 'thread' argument passing which is always curthread.
Remove the unuseful extra-argument and pass explicitly curthread to lower
layer functions, when necessary.

KPI results broken by this change, which should affect several ports, so
version bumping and manpage update will be further committed.

Tested by: kris, pho, Diego Sardina <siarodx at gmail dot com>
2008-01-13 14:44:15 +00:00
Attilio Rao
cb05b60a89 vn_lock() is currently only used with the 'curthread' passed as argument.
Remove this argument and pass curthread directly to underlying
VOP_LOCK1() VFS method. This modify makes the code cleaner and in
particular remove an annoying dependence helping next lockmgr() cleanup.
KPI results, obviously, changed.

Manpage and FreeBSD_version will be updated through further commits.

As a side note, would be valuable to say that next commits will address
a similar cleanup about VFS methods, in particular vop_lock1 and
vop_unlock.

Tested by:	Diego Sardina <siarodx at gmail dot com>,
		Andrea Di Pasquale <whyx dot it at gmail dot com>
2008-01-10 01:10:58 +00:00
Joseph Koshy
9596916c4d Add stub functions to unbreak LINT. 2007-12-07 17:21:53 +00:00
Joseph Koshy
d07f36b075 Kernel and hwpmc(4) support for callchain capture.
Sponsored by:	FreeBSD Foundation and Google Inc.
2007-12-07 08:20:17 +00:00
Joseph Koshy
4dd9b0c085 Revert revision 1.4.
Intel CPUs with family 0x6, model 0xE and later (i.e., Intel Core(TM))
have a PMC architecture that differs somewhat from previous CPUs in
family 0x6.  Even though the basic programming model is similar, the
documented set of legal values that may be loaded into their PMC MSRs
differs from that of the previous PMCs in family 0x6 and reusing bit
values valid for the older PMCs could result in undefined behaviour in
the general case.
2007-11-29 06:43:58 +00:00
Julian Elischer
3745c395ec Rename the kthread_xxx (e.g. kthread_create()) calls
to kproc_xxx as they actually make whole processes.
Thos makes way for us to add REAL kthread_create() and friends
that actually make theads. it turns out that most of these
calls actually end up being moved back to the thread version
when it's added. but we need to make this cosmetic change first.

I'd LOVE to do this rename in 7.0  so that we can eventually MFC the
new kthread_xxx() calls.
2007-10-20 23:23:23 +00:00
Jeff Roberson
982d11f836 Commit 14/14 of sched_lock decomposition.
- Use thread_lock() rather than sched_lock for per-thread scheduling
   sychronization.
 - Use the per-process spinlock rather than the sched_lock for per-process
   scheduling synchronization.

Tested by:      kris, current@
Tested on:      i386, amd64, ULE, 4BSD, libthr, libkse, PREEMPTION, etc.
Discussed with: kris, attilio, kmacy, jhb, julian, bde (small parts each)
2007-06-05 00:00:57 +00:00
Joseph Koshy
382d30cdd8 Fix witness(4) warnings about mutex use.
Group mutexes used in hwpmc(4) into 3 "types" in the sense of
witness(4):

 - leaf spin mutexes---only one of these should be held at a time,
   so these mutexes are specified as belonging to a single witness
   type "pmc-leaf".

 - `struct pmc_owner' descriptors are protected by a spin mutex of
   witness type "pmc-owner-proc".  Since we call wakeup_one() while
   holding these mutexes, the witness type of these mutexes needs
   to dominate that of "sleepq chain" mutexes.

 - logger threads use a sleep mutex, of type "pmc-sleep".

Submitted by:	wkoszek (earlier patch)
2007-04-19 08:02:51 +00:00
John Baldwin
4d70511ac3 Use pause() rather than tsleep() on stack variables and function pointers. 2007-02-27 17:23:29 +00:00
Robert Watson
acd3428b7d Sweep kernel replacing suser(9) calls with priv(9) calls, assigning
specific privilege names to a broad range of privileges.  These may
require some future tweaking.

Sponsored by:           nCircle Network Security, Inc.
Obtained from:          TrustedBSD Project
Discussed on:           arch@
Reviewed (at least in part) by: mlaier, jmg, pjd, bde, ceri,
                        Alex Lyashkov <umka at sevcity dot net>,
                        Skip Ford <skip dot ford at verizon dot net>,
                        Antoine Brodin <antoine dot brodin at laposte dot net>
2006-11-06 13:42:10 +00:00
Robert Watson
5702e0965e Declare security and security.bsd sysctl hierarchies in sysctl.h along
with other commonly used sysctl name spaces, rather than declaring them
all over the place.

MFC after:	1 month
Sponsored by:	nCircle Network Security, Inc.
2006-09-17 20:00:36 +00:00
John Baldwin
67ab9fd759 First pass at removing Alpha kernel support. 2006-05-11 22:25:28 +00:00
John Baldwin
0f180a7cce Change msleep() and tsleep() to not alter the calling thread's priority
if the specified priority is zero.  This avoids a race where the calling
thread could read a snapshot of it's current priority, then a different
thread could change the first thread's priority, then the original thread
would call sched_prio() inside msleep() undoing the change made by the
second thread.  I used a priority of zero as no thread that calls msleep()
or tsleep() should be specifying a priority of zero anyway.

The various places that passed 'curthread->td_priority' or some variant
as the priority now pass 0.
2006-04-17 18:20:38 +00:00
Joseph Koshy
7c9f60e38f Fix a cut-n-paste bug that crept in.
Reported by:	"Pawel Worach" pawel.worach at gmail.com
2006-04-11 01:15:26 +00:00
Paul Saab
cef5d0ae84 Add support for Intel cpu model's 5 & 6.
Approved by:	jkoshy
2006-04-04 02:36:04 +00:00
Joseph Koshy
9282fe9cdb Forcibly turn off all PMCs at module unload time.
MFC after:	1 week
2006-03-28 14:09:21 +00:00
Joseph Koshy
49874f6ea3 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)
2006-03-26 12:20:54 +00:00
Joseph Koshy
66f3bc782b When deconfiguring a log, only stop PMCs that are in the RUNNING
state.
2006-03-18 03:54:07 +00:00
Joseph Koshy
9d0a2685e4 When compiled with -DDEBUG, only print the old value of a PMC in a
debugging message if the flag PMC_F_OLDVALUE was specified in the
PMC_OP_RW request being acted upon.  This should fix Coverity bug
CID 671.

Found by:	Coverity Prevent
MFC after:	3 weeks
2006-03-16 16:32:56 +00:00
Joseph Koshy
fc9a2b80c4 When a process is de-configuring a log file, also stop all of its
PMCs that require a log file to operate.  This change should fix
PR 90269.

PR:		kern/90269
MFC after:	1 week
2006-03-09 02:08:12 +00:00
Joseph Koshy
2b01a08446 Fix a memory leak.
Found by:	Coverity
2006-01-17 16:53:50 +00:00
Joseph Koshy
ba8ae2de36 - Plug a memory leak: free up per-cpu sample buffers at module unload time.
- Correct a few style nits.
2005-12-26 16:10:00 +00:00
Joseph Koshy
06490ba975 Wrap comment lines to be under 80 characters wide.
MFC after:	3 days
2005-12-26 09:27:24 +00:00
Ruslan Ermilov
342ed5d948 Fix -Wundef warnings found when compiling i386 LINT, GENERIC and
custom kernels.
2005-12-05 11:58:35 +00:00
Paul Saab
e8fbd4a86d Add support for a new/unreleased Pentium-M.
Reviewed by:	jkoshy
2005-11-18 16:47:24 +00:00
Joseph Koshy
126a039375 Bug fix initialization on multi-core HTT CPUs.
Reported by:	ps
Tested by:	ps
2005-10-10 15:21:08 +00:00
Joseph Koshy
bebaef4a3d Process one NMI interrupt per handler invocation as the processor
'buffers' pending NMIs from multiple interrupting PMCs and delivers
them serially.

Reported by:	 Olivier Crameri <olivier.crameri@epfl.ch>
MFC after:	3 days
2005-09-12 15:55:44 +00:00
Joseph Koshy
c402059e2e Re-enable sampling on the AMD64. 2005-08-27 16:07:12 +00:00
Joseph Koshy
e753fde4e6 On x86 processors, turn off any 'INTERRUPT' capabilities on PMCs
if the CPU does not have its local APIC enabled.

MFC after:	3 days
2005-08-22 18:20:41 +00:00
Joseph Koshy
744d67975f Return EOPNOTSUPP instead of EINVAL if a PMC allocation request
specifies a PMC capability (e.g., sampling) that is not supported
by hardware.  Return EINVAL early if the PMC class passed in is
not recognized.

MFC after:	3 days
2005-08-22 18:18:20 +00:00
Joseph Koshy
a8eb16c5ea Print PMC capabilities at module load time.
MFC after:	3 days
2005-08-22 17:51:08 +00:00
Joseph Koshy
d4d6be499f Turn off sampling modes on the AMD64 till the time I can track down
the reason for the double fault seen when sampling under load.

MFC after:	3 days
2005-08-22 02:59:51 +00:00
Joseph Koshy
fadcc6e201 Fail the module loading process if the currently executing kernel
was not compiled with 'options HWPMC_HOOKS' or if the compiled-in
version numbers of the kernel and module are out of sync.

Reported by:	cracauer
MFC after:	3 days
2005-07-30 09:02:42 +00:00
Joseph Koshy
d9dcd4f93c Use LK_CANRECURSE since when a PMC-owning process performs an exec,
the new text vnode is already locked by itself.

MFC after:	3 days
2005-07-17 04:18:06 +00:00
John Baldwin
122eceef61 Convert the atomic_ptr() operations over to operating on uintptr_t
variables rather than void * variables.  This makes it easier and simpler
to get asm constraints and volatile keywords correct.

MFC after:	3 days
Tested on:	i386, alpha, sparc64
Compiled on:	ia64, powerpc, amd64
Kernel toolchain busted on:	arm
2005-07-15 18:17:59 +00:00
Joseph Koshy
f15067e8b2 Fix breakage introduced in rev 1.7.
MFC after:	3 days
2005-07-14 15:09:14 +00:00
Joseph Koshy
fbf1556d46 sys/dev/hwpmc/hwpmc_{amd,piv,ppro}.c:
- Update driver interrupt statistics correctly.

sys/sys/pmc.h, sys/dev/hwpmc/hwpmc_mod.c:
- Fix a bug affecting debug printfs.
- Move the 'stalled' flag from being in a bit in the
  'pm_flags' field of a 'struct pmc' to a field of its own in the
  same structure.  This flag is updated from the NMI handler and
  keeping it separate makes it easier to avoid races with other
  parts of the code.

sys/dev/hwpmc/hwpmc_logging.c:
- Do arithmetic with 'uintptr_t' types rather that casting
  to and from 'char *'.

Approved by:	re (scottl)
2005-07-09 17:29:36 +00:00
Joseph Koshy
86a655492a - Update the CPU version check to recognize P4/EMT64 CPUs. [1]
- Allow libpmc(3) to support P4/EMT64 PMCs on the amd64 architecture
  and AMD K8 PMCs on the i386. [2]

Submitted by:	ps [1]
Pointy hat:	myself [2]
Approved by:	re (scottl)
2005-07-03 16:33:22 +00:00
Joseph Koshy
151392465f 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)
2005-06-30 19:01:26 +00:00
Joseph Koshy
54bad7c6c2 Fix a -Wuninitialized warning reported by rwatson.
Approved by:	re (blanket hwpmc)
2005-06-21 06:03:30 +00:00
Joseph Koshy
f263522a45 MFP4:
- Implement sampling modes and logging support in hwpmc(4).

- Separate MI and MD parts of hwpmc(4) and allow sharing of
  PMC implementations across different architectures.
  Add support for P4 (EMT64) style PMCs to the amd64 code.

- New pmcstat(8) options: -E (exit time counts) -W (counts
  every context switch), -R (print log file).

- pmc(3) API changes, improve our ability to keep ABI compatibility
  in the future.  Add more 'alias' names for commonly used events.

- bug fixes & documentation.
2005-06-09 19:45:09 +00:00
Joseph Koshy
36c0fd9d0f Kernel hooks to support PMC sampling modes.
Reviewed by:	alc
2005-05-30 06:29:29 +00:00
Joseph Koshy
c5153e190b Add convenience APIs pmc_width() and pmc_capabilities() to -lpmc.
Have pmcstat(8) and pmccontrol(8) use these APIs.

Return PMC class-related constants (PMC widths and capabilities)
with the OP GETCPUINFO call leaving OP PMCINFO to return only the
dynamic information associated with a PMC (i.e., whether enabled,
owner pid, reload count etc.).

Allow pmc_read() (i.e., OPS PMCRW) on active self-attached PMCs to
get upto-date values from hardware since we can guarantee that the
hardware is running the correct PMC at the time of the call.

Bug fixes:
 - (x86 class processors) Fix a bug that prevented an RDPMC
   instruction from being recognized as permitted till after the
   attached process had context switched out and back in again after
   a pmc_start() call.

   Tighten the rules for using RDPMC class instructions: a GETMSR
   OP is now allowed only after an OP ATTACH has been done by the
   PMC's owner to itself.  OP GETMSR is not allowed for PMCs that
   track descendants, for PMCs attached to processes other than
   their owner processes.

 - (P4/HTT processors only) Fix a bug that caused the MI and MD
   layers to get out of sync.  Add a new MD operation 'get_config()'
   as part of this fix.

 - Allow multiple system-mode PMCs at the same row-index but on
   different CPUs to be allocated.

 - Reject allocation of an administratively disabled PMC.

Misc. code cleanups and refactoring.  Improve a few comments.
2005-05-01 14:11:49 +00:00
Joseph Koshy
6b8c8cd85f Return the correct register number in the 'get_msr()' MD function.
Only allow a process to use the x86 RDPMC instruction if it has
allocated and attached a PMC to itself.

Inform the MD layer of the "pseudo context switch out" that needs
to be done when the last thread of a process is exiting.
2005-04-28 08:13:19 +00:00
Marcel Moolenaar
7ad17ef97e Include <sys/pmc.h> instead of <machine/pmc_mdep.h>. The MI header
includes the MD header for us. Do not include <machine/specialreg.h>
as it is not a header file that can be included from MI files. It
is included from <machine/pmc_mdep.h> if so needed and possible.

Ok'd: jkoshy@
2005-04-20 20:26:39 +00:00
Joseph Koshy
e1691ef740 Remove dead variable. 2005-04-20 04:43:30 +00:00
Warner Losh
e68792740e Remove unused variable that was horking up the LINT build 2005-04-19 21:40:49 +00:00
Warner Losh
869f4a8bc8 Minimal changes to get this to compile with -DDEBUG defined as well
as hack a couple used before set warnings for LINT happiness.
2005-04-19 21:12:57 +00:00
Joseph Koshy
ebccf1e3a6 Bring a working snapshot of hwpmc(4), its associated libraries, userland utilities
and documentation into -CURRENT.

Bump FreeBSD_version.

Reviewed by:	alc, jhb (kernel changes)
2005-04-19 04:01:25 +00:00