freebsd-dev/usr.sbin/pmcstat/pmcstat_log.c
Matt Macy 959826ca1b pmc(3)/hwpmc(4): update supported Intel processors to rely fully on the
vendor provided pmu-events tables and sundry cleanups.

The vendor pmu-events tables provide counter descriptions, default
sample rates, event, umask, and flag values for all the counter
configuration permutations. Using this gives us:

- much simpler kernel code for the MD component
- helpful long and short event descriptions
- simpler user code
- sample rates that won't overload the system

Update man page with newer sample types and remove unused sample type.
2018-05-26 19:29:19 +00:00

743 lines
19 KiB
C

/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2005-2007, Joseph Koshy
* Copyright (c) 2007 The FreeBSD Foundation
* All rights reserved.
*
* Portions of this software were developed by A. Joseph Koshy under
* sponsorship from the FreeBSD Foundation and Google, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/*
* Transform a hwpmc(4) log into human readable form, and into
* gprof(1) compatible profiles.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/endian.h>
#include <sys/cpuset.h>
#include <sys/gmon.h>
#include <sys/imgact_aout.h>
#include <sys/imgact_elf.h>
#include <sys/mman.h>
#include <sys/pmc.h>
#include <sys/queue.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <netinet/in.h>
#include <assert.h>
#include <curses.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <gelf.h>
#include <libgen.h>
#include <limits.h>
#include <netdb.h>
#include <pmc.h>
#include <pmclog.h>
#include <sysexits.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "pmcstat.h"
#include "pmcstat_log.h"
#include "pmcstat_top.h"
/*
* PUBLIC INTERFACES
*
* pmcstat_initialize_logging() initialize this module, called first
* pmcstat_shutdown_logging() orderly shutdown, called last
* pmcstat_open_log() open an eventlog for processing
* pmcstat_process_log() print/convert an event log
* pmcstat_display_log() top mode display for the log
* pmcstat_close_log() finish processing an event log
*
* IMPLEMENTATION NOTES
*
* We correlate each 'callchain' or 'sample' entry seen in the event
* log back to an executable object in the system. Executable objects
* include:
* - program executables,
* - shared libraries loaded by the runtime loader,
* - dlopen()'ed objects loaded by the program,
* - the runtime loader itself,
* - the kernel and kernel modules.
*
* Each process that we know about is treated as a set of regions that
* map to executable objects. Processes are described by
* 'pmcstat_process' structures. Executable objects are tracked by
* 'pmcstat_image' structures. The kernel and kernel modules are
* common to all processes (they reside at the same virtual addresses
* for all processes). Individual processes can have their text
* segments and shared libraries loaded at process-specific locations.
*
* A given executable object can be in use by multiple processes
* (e.g., libc.so) and loaded at a different address in each.
* pmcstat_pcmap structures track per-image mappings.
*
* The sample log could have samples from multiple PMCs; we
* generate one 'gmon.out' profile per PMC.
*
* IMPLEMENTATION OF GMON OUTPUT
*
* Each executable object gets one 'gmon.out' profile, per PMC in
* use. Creation of 'gmon.out' profiles is done lazily. The
* 'gmon.out' profiles generated for a given sampling PMC are
* aggregates of all the samples for that particular executable
* object.
*
* IMPLEMENTATION OF SYSTEM-WIDE CALLGRAPH OUTPUT
*
* Each active pmcid has its own callgraph structure, described by a
* 'struct pmcstat_callgraph'. Given a process id and a list of pc
* values, we map each pc value to a tuple (image, symbol), where
* 'image' denotes an executable object and 'symbol' is the closest
* symbol that precedes the pc value. Each pc value in the list is
* also given a 'rank' that reflects its depth in the call stack.
*/
struct pmcstat_pmcs pmcstat_pmcs = LIST_HEAD_INITIALIZER(pmcstat_pmcs);
/*
* All image descriptors are kept in a hash table.
*/
struct pmcstat_image_hash_list pmcstat_image_hash[PMCSTAT_NHASH];
/*
* All process descriptors are kept in a hash table.
*/
struct pmcstat_process_hash_list pmcstat_process_hash[PMCSTAT_NHASH];
struct pmcstat_stats pmcstat_stats; /* statistics */
static int ps_samples_period; /* samples count between top refresh. */
struct pmcstat_process *pmcstat_kernproc; /* kernel 'process' */
#include "pmcpl_gprof.h"
#include "pmcpl_callgraph.h"
#include "pmcpl_annotate.h"
#include "pmcpl_annotate_cg.h"
#include "pmcpl_calltree.h"
static struct pmc_plugins plugins[] = {
{
.pl_name = "none",
},
{
.pl_name = "callgraph",
.pl_init = pmcpl_cg_init,
.pl_shutdown = pmcpl_cg_shutdown,
.pl_process = pmcpl_cg_process,
.pl_topkeypress = pmcpl_cg_topkeypress,
.pl_topdisplay = pmcpl_cg_topdisplay
},
{
.pl_name = "gprof",
.pl_shutdown = pmcpl_gmon_shutdown,
.pl_process = pmcpl_gmon_process,
.pl_initimage = pmcpl_gmon_initimage,
.pl_shutdownimage = pmcpl_gmon_shutdownimage,
.pl_newpmc = pmcpl_gmon_newpmc
},
{
.pl_name = "annotate",
.pl_process = pmcpl_annotate_process
},
{
.pl_name = "calltree",
.pl_configure = pmcpl_ct_configure,
.pl_init = pmcpl_ct_init,
.pl_shutdown = pmcpl_ct_shutdown,
.pl_process = pmcpl_ct_process,
.pl_topkeypress = pmcpl_ct_topkeypress,
.pl_topdisplay = pmcpl_ct_topdisplay
},
{
.pl_name = "annotate_cg",
.pl_process = pmcpl_annotate_cg_process
},
{
.pl_name = NULL
}
};
static int pmcstat_mergepmc;
int pmcstat_pmcinfilter = 0; /* PMC filter for top mode. */
float pmcstat_threshold = 0.5; /* Cost filter for top mode. */
/*
* Prototypes
*/
static void pmcstat_stats_reset(int _reset_global);
/*
* PMC count.
*/
int pmcstat_npmcs;
/*
* PMC Top mode pause state.
*/
static int pmcstat_pause;
static void
pmcstat_stats_reset(int reset_global)
{
struct pmcstat_pmcrecord *pr;
/* Flush PMCs stats. */
LIST_FOREACH(pr, &pmcstat_pmcs, pr_next) {
pr->pr_samples = 0;
pr->pr_dubious_frames = 0;
}
ps_samples_period = 0;
/* Flush global stats. */
if (reset_global)
bzero(&pmcstat_stats, sizeof(struct pmcstat_stats));
}
/*
* Resolve file name and line number for the given address.
*/
int
pmcstat_image_addr2line(struct pmcstat_image *image, uintfptr_t addr,
char *sourcefile, size_t sourcefile_len, unsigned *sourceline,
char *funcname, size_t funcname_len)
{
static int addr2line_warn = 0;
char *sep, cmdline[PATH_MAX], imagepath[PATH_MAX];
unsigned l;
int fd;
if (image->pi_addr2line == NULL) {
/* Try default debug file location. */
snprintf(imagepath, sizeof(imagepath),
"/usr/lib/debug/%s%s.debug",
args.pa_fsroot,
pmcstat_string_unintern(image->pi_fullpath));
fd = open(imagepath, O_RDONLY);
if (fd < 0) {
/* Old kernel symbol path. */
snprintf(imagepath, sizeof(imagepath), "%s%s.symbols",
args.pa_fsroot,
pmcstat_string_unintern(image->pi_fullpath));
fd = open(imagepath, O_RDONLY);
if (fd < 0) {
snprintf(imagepath, sizeof(imagepath), "%s%s",
args.pa_fsroot,
pmcstat_string_unintern(
image->pi_fullpath));
}
}
if (fd >= 0)
close(fd);
/*
* New addr2line support recursive inline function with -i
* but the format does not add a marker when no more entries
* are available.
*/
snprintf(cmdline, sizeof(cmdline), "addr2line -Cfe \"%s\"",
imagepath);
image->pi_addr2line = popen(cmdline, "r+");
if (image->pi_addr2line == NULL) {
if (!addr2line_warn) {
addr2line_warn = 1;
warnx(
"WARNING: addr2line is needed for source code information."
);
}
return (0);
}
}
if (feof(image->pi_addr2line) || ferror(image->pi_addr2line)) {
warnx("WARNING: addr2line pipe error");
pclose(image->pi_addr2line);
image->pi_addr2line = NULL;
return (0);
}
fprintf(image->pi_addr2line, "%p\n", (void *)addr);
if (fgets(funcname, funcname_len, image->pi_addr2line) == NULL) {
warnx("WARNING: addr2line function name read error");
return (0);
}
sep = strchr(funcname, '\n');
if (sep != NULL)
*sep = '\0';
if (fgets(sourcefile, sourcefile_len, image->pi_addr2line) == NULL) {
warnx("WARNING: addr2line source file read error");
return (0);
}
sep = strchr(sourcefile, ':');
if (sep == NULL) {
warnx("WARNING: addr2line source line separator missing");
return (0);
}
*sep = '\0';
l = atoi(sep+1);
if (l == 0)
return (0);
*sourceline = l;
return (1);
}
/*
* Given a pmcid in use, find its human-readable name.
*/
const char *
pmcstat_pmcid_to_name(pmc_id_t pmcid)
{
struct pmcstat_pmcrecord *pr;
LIST_FOREACH(pr, &pmcstat_pmcs, pr_next)
if (pr->pr_pmcid == pmcid)
return (pmcstat_string_unintern(pr->pr_pmcname));
return NULL;
}
/*
* Convert PMC index to name.
*/
const char *
pmcstat_pmcindex_to_name(int pmcin)
{
struct pmcstat_pmcrecord *pr;
LIST_FOREACH(pr, &pmcstat_pmcs, pr_next)
if (pr->pr_pmcin == pmcin)
return pmcstat_string_unintern(pr->pr_pmcname);
return NULL;
}
/*
* Return PMC record with given index.
*/
struct pmcstat_pmcrecord *
pmcstat_pmcindex_to_pmcr(int pmcin)
{
struct pmcstat_pmcrecord *pr;
LIST_FOREACH(pr, &pmcstat_pmcs, pr_next)
if (pr->pr_pmcin == pmcin)
return pr;
return NULL;
}
/*
* Print log entries as text.
*/
static int
pmcstat_print_log(void)
{
struct pmclog_ev ev;
uint32_t npc;
while (pmclog_read(args.pa_logparser, &ev) == 0) {
assert(ev.pl_state == PMCLOG_OK);
switch (ev.pl_type) {
case PMCLOG_TYPE_CALLCHAIN:
PMCSTAT_PRINT_ENTRY("callchain",
"%d 0x%x %d %d %c", ev.pl_u.pl_cc.pl_pid,
ev.pl_u.pl_cc.pl_pmcid,
PMC_CALLCHAIN_CPUFLAGS_TO_CPU(ev.pl_u.pl_cc. \
pl_cpuflags), ev.pl_u.pl_cc.pl_npc,
PMC_CALLCHAIN_CPUFLAGS_TO_USERMODE(ev.pl_u.pl_cc.\
pl_cpuflags) ? 'u' : 's');
for (npc = 0; npc < ev.pl_u.pl_cc.pl_npc; npc++)
PMCSTAT_PRINT_ENTRY("...", "%p",
(void *) ev.pl_u.pl_cc.pl_pc[npc]);
break;
case PMCLOG_TYPE_CLOSELOG:
PMCSTAT_PRINT_ENTRY("closelog",);
break;
case PMCLOG_TYPE_DROPNOTIFY:
PMCSTAT_PRINT_ENTRY("drop",);
break;
case PMCLOG_TYPE_INITIALIZE:
PMCSTAT_PRINT_ENTRY("initlog","0x%x \"%s\"",
ev.pl_u.pl_i.pl_version,
pmc_name_of_cputype(ev.pl_u.pl_i.pl_arch));
if ((ev.pl_u.pl_i.pl_version & 0xFF000000) !=
PMC_VERSION_MAJOR << 24)
warnx(
"WARNING: Log version 0x%x != expected version 0x%x.",
ev.pl_u.pl_i.pl_version, PMC_VERSION);
break;
case PMCLOG_TYPE_MAP_IN:
PMCSTAT_PRINT_ENTRY("map-in","%d %p \"%s\"",
ev.pl_u.pl_mi.pl_pid,
(void *) ev.pl_u.pl_mi.pl_start,
ev.pl_u.pl_mi.pl_pathname);
break;
case PMCLOG_TYPE_MAP_OUT:
PMCSTAT_PRINT_ENTRY("map-out","%d %p %p",
ev.pl_u.pl_mo.pl_pid,
(void *) ev.pl_u.pl_mo.pl_start,
(void *) ev.pl_u.pl_mo.pl_end);
break;
case PMCLOG_TYPE_PMCALLOCATE:
PMCSTAT_PRINT_ENTRY("allocate","0x%x \"%s\" 0x%x",
ev.pl_u.pl_a.pl_pmcid,
ev.pl_u.pl_a.pl_evname,
ev.pl_u.pl_a.pl_flags);
break;
case PMCLOG_TYPE_PMCALLOCATEDYN:
PMCSTAT_PRINT_ENTRY("allocatedyn","0x%x \"%s\" 0x%x",
ev.pl_u.pl_ad.pl_pmcid,
ev.pl_u.pl_ad.pl_evname,
ev.pl_u.pl_ad.pl_flags);
break;
case PMCLOG_TYPE_PMCATTACH:
PMCSTAT_PRINT_ENTRY("attach","0x%x %d \"%s\"",
ev.pl_u.pl_t.pl_pmcid,
ev.pl_u.pl_t.pl_pid,
ev.pl_u.pl_t.pl_pathname);
break;
case PMCLOG_TYPE_PMCDETACH:
PMCSTAT_PRINT_ENTRY("detach","0x%x %d",
ev.pl_u.pl_d.pl_pmcid,
ev.pl_u.pl_d.pl_pid);
break;
case PMCLOG_TYPE_PROCCSW:
PMCSTAT_PRINT_ENTRY("cswval","0x%x %d %jd",
ev.pl_u.pl_c.pl_pmcid,
ev.pl_u.pl_c.pl_pid,
ev.pl_u.pl_c.pl_value);
break;
case PMCLOG_TYPE_PROCEXEC:
PMCSTAT_PRINT_ENTRY("exec","0x%x %d %p \"%s\"",
ev.pl_u.pl_x.pl_pmcid,
ev.pl_u.pl_x.pl_pid,
(void *) ev.pl_u.pl_x.pl_entryaddr,
ev.pl_u.pl_x.pl_pathname);
break;
case PMCLOG_TYPE_PROCEXIT:
PMCSTAT_PRINT_ENTRY("exitval","0x%x %d %jd",
ev.pl_u.pl_e.pl_pmcid,
ev.pl_u.pl_e.pl_pid,
ev.pl_u.pl_e.pl_value);
break;
case PMCLOG_TYPE_PROCFORK:
PMCSTAT_PRINT_ENTRY("fork","%d %d",
ev.pl_u.pl_f.pl_oldpid,
ev.pl_u.pl_f.pl_newpid);
break;
case PMCLOG_TYPE_USERDATA:
PMCSTAT_PRINT_ENTRY("userdata","0x%x",
ev.pl_u.pl_u.pl_userdata);
break;
case PMCLOG_TYPE_SYSEXIT:
PMCSTAT_PRINT_ENTRY("exit","%d",
ev.pl_u.pl_se.pl_pid);
break;
default:
fprintf(args.pa_printfile, "unknown event (type %d).\n",
ev.pl_type);
}
}
if (ev.pl_state == PMCLOG_EOF)
return (PMCSTAT_FINISHED);
else if (ev.pl_state == PMCLOG_REQUIRE_DATA)
return (PMCSTAT_RUNNING);
errx(EX_DATAERR,
"ERROR: event parsing failed (record %jd, offset 0x%jx).",
(uintmax_t) ev.pl_count + 1, ev.pl_offset);
/*NOTREACHED*/
}
/*
* Public Interfaces.
*/
/*
* Process a log file in offline analysis mode.
*/
int
pmcstat_process_log(void)
{
/*
* If analysis has not been asked for, just print the log to
* the current output file.
*/
if (args.pa_flags & FLAG_DO_PRINT)
return (pmcstat_print_log());
else
return (pmcstat_analyze_log(&args, plugins, &pmcstat_stats, pmcstat_kernproc,
pmcstat_mergepmc, &pmcstat_npmcs, &ps_samples_period));
}
/*
* Refresh top display.
*/
static void
pmcstat_refresh_top(void)
{
int v_attrs;
float v;
char pmcname[40];
struct pmcstat_pmcrecord *pmcpr;
/* If in pause mode do not refresh display. */
if (pmcstat_pause)
return;
/* Wait until PMC pop in the log. */
pmcpr = pmcstat_pmcindex_to_pmcr(pmcstat_pmcinfilter);
if (pmcpr == NULL)
return;
/* Format PMC name. */
if (pmcstat_mergepmc)
snprintf(pmcname, sizeof(pmcname), "[%s]",
pmcstat_string_unintern(pmcpr->pr_pmcname));
else
snprintf(pmcname, sizeof(pmcname), "%s.%d",
pmcstat_string_unintern(pmcpr->pr_pmcname),
pmcstat_pmcinfilter);
/* Format samples count. */
if (ps_samples_period > 0)
v = (pmcpr->pr_samples * 100.0) / ps_samples_period;
else
v = 0.;
v_attrs = PMCSTAT_ATTRPERCENT(v);
PMCSTAT_PRINTBEGIN();
PMCSTAT_PRINTW("PMC: %s Samples: %u ",
pmcname,
pmcpr->pr_samples);
PMCSTAT_ATTRON(v_attrs);
PMCSTAT_PRINTW("(%.1f%%) ", v);
PMCSTAT_ATTROFF(v_attrs);
PMCSTAT_PRINTW(", %u unresolved\n\n",
pmcpr->pr_dubious_frames);
if (plugins[args.pa_plugin].pl_topdisplay != NULL)
plugins[args.pa_plugin].pl_topdisplay();
PMCSTAT_PRINTEND();
}
/*
* Find the next pmc index to display.
*/
static void
pmcstat_changefilter(void)
{
int pmcin;
struct pmcstat_pmcrecord *pmcr;
/*
* Find the next merge target.
*/
if (pmcstat_mergepmc) {
pmcin = pmcstat_pmcinfilter;
do {
pmcr = pmcstat_pmcindex_to_pmcr(pmcstat_pmcinfilter);
if (pmcr == NULL || pmcr == pmcr->pr_merge)
break;
pmcstat_pmcinfilter++;
if (pmcstat_pmcinfilter >= pmcstat_npmcs)
pmcstat_pmcinfilter = 0;
} while (pmcstat_pmcinfilter != pmcin);
}
}
/*
* Top mode keypress.
*/
int
pmcstat_keypress_log(void)
{
int c, ret = 0;
WINDOW *w;
w = newwin(1, 0, 1, 0);
c = wgetch(w);
wprintw(w, "Key: %c => ", c);
switch (c) {
case 'c':
wprintw(w, "enter mode 'd' or 'a' => ");
c = wgetch(w);
if (c == 'd') {
args.pa_topmode = PMCSTAT_TOP_DELTA;
wprintw(w, "switching to delta mode");
} else {
args.pa_topmode = PMCSTAT_TOP_ACCUM;
wprintw(w, "switching to accumulation mode");
}
break;
case 'm':
pmcstat_mergepmc = !pmcstat_mergepmc;
/*
* Changing merge state require data reset.
*/
if (plugins[args.pa_plugin].pl_shutdown != NULL)
plugins[args.pa_plugin].pl_shutdown(NULL);
pmcstat_stats_reset(0);
if (plugins[args.pa_plugin].pl_init != NULL)
plugins[args.pa_plugin].pl_init();
/* Update filter to be on a merge target. */
pmcstat_changefilter();
wprintw(w, "merge PMC %s", pmcstat_mergepmc ? "on" : "off");
break;
case 'n':
/* Close current plugin. */
if (plugins[args.pa_plugin].pl_shutdown != NULL)
plugins[args.pa_plugin].pl_shutdown(NULL);
/* Find next top display available. */
do {
args.pa_plugin++;
if (plugins[args.pa_plugin].pl_name == NULL)
args.pa_plugin = 0;
} while (plugins[args.pa_plugin].pl_topdisplay == NULL);
/* Open new plugin. */
pmcstat_stats_reset(0);
if (plugins[args.pa_plugin].pl_init != NULL)
plugins[args.pa_plugin].pl_init();
wprintw(w, "switching to plugin %s",
plugins[args.pa_plugin].pl_name);
break;
case 'p':
pmcstat_pmcinfilter++;
if (pmcstat_pmcinfilter >= pmcstat_npmcs)
pmcstat_pmcinfilter = 0;
pmcstat_changefilter();
wprintw(w, "switching to PMC %s.%d",
pmcstat_pmcindex_to_name(pmcstat_pmcinfilter),
pmcstat_pmcinfilter);
break;
case ' ':
pmcstat_pause = !pmcstat_pause;
if (pmcstat_pause)
wprintw(w, "pause => press space again to continue");
break;
case 'q':
wprintw(w, "exiting...");
ret = 1;
break;
default:
if (plugins[args.pa_plugin].pl_topkeypress != NULL)
if (plugins[args.pa_plugin].pl_topkeypress(c, (void *)w))
ret = 1;
}
wrefresh(w);
delwin(w);
return ret;
}
/*
* Top mode display.
*/
void
pmcstat_display_log(void)
{
pmcstat_refresh_top();
/* Reset everythings if delta mode. */
if (args.pa_topmode == PMCSTAT_TOP_DELTA) {
if (plugins[args.pa_plugin].pl_shutdown != NULL)
plugins[args.pa_plugin].pl_shutdown(NULL);
pmcstat_stats_reset(0);
if (plugins[args.pa_plugin].pl_init != NULL)
plugins[args.pa_plugin].pl_init();
}
}
/*
* Configure a plugins.
*/
void
pmcstat_pluginconfigure_log(char *opt)
{
if (strncmp(opt, "threshold=", 10) == 0) {
pmcstat_threshold = atof(opt+10);
} else {
if (plugins[args.pa_plugin].pl_configure != NULL) {
if (!plugins[args.pa_plugin].pl_configure(opt))
err(EX_USAGE,
"ERROR: unknown option <%s>.", opt);
}
}
}
void
pmcstat_log_shutdown_logging(void)
{
pmcstat_shutdown_logging(&args, plugins, &pmcstat_stats);
}
void
pmcstat_log_initialize_logging(void)
{
pmcstat_initialize_logging(&pmcstat_kernproc,
&args, plugins, &pmcstat_npmcs, &pmcstat_mergepmc);
}