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D57779.id180403.diff
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diff --git a/usr.sbin/pmc/cmd_pmc_frontend.cc b/usr.sbin/pmc/cmd_pmc_frontend.cc
new file mode 100644
--- /dev/null
+++ b/usr.sbin/pmc/cmd_pmc_frontend.cc
@@ -0,0 +1,242 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright (c) 2026, Netflix, Inc.
+ *
+ * This software was developed by Ali Mashtizadeh under the sponsorship from
+ * Netflix, 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.
+ *
+ */
+
+#include <sys/param.h>
+#include <sys/cpuset.h>
+#include <sys/event.h>
+#include <sys/queue.h>
+#include <sys/socket.h>
+#include <sys/stat.h>
+#include <sys/sysctl.h>
+#include <sys/time.h>
+#include <sys/ttycom.h>
+#include <sys/user.h>
+#include <sys/wait.h>
+
+#include <assert.h>
+#include <curses.h>
+#include <err.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <getopt.h>
+#include <kvm.h>
+#include <libgen.h>
+#include <limits.h>
+#include <locale.h>
+#include <math.h>
+#include <pmc.h>
+#include <pmclog.h>
+#include <regex.h>
+#include <signal.h>
+#include <stdarg.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <stddef.h>
+#include <string.h>
+#include <sysexits.h>
+#include <unistd.h>
+
+#include <libpmcstat.h>
+#include "cmd_pmc.h"
+
+#include <iostream>
+#include <map>
+#include <set>
+#include <string>
+#include <unordered_map>
+#include <unordered_set>
+#include <vector>
+
+#include <dev/hwpmc/hwpmc_ibs.h>
+#include "display.hh"
+#include "view.hh"
+
+struct frontend {
+ syminfo func;
+ int64_t ocmiss;
+ int64_t l2miss;
+ int64_t l3miss;
+ int64_t l1tlbmiss;
+ int64_t l2tlbmiss;
+ int64_t latency;
+ int64_t samples;
+};
+
+static int sortcol = 2;
+
+class frontend_view : public pmcview
+{
+public:
+ frontend_view() : pmcview(), samples() { }
+ ~frontend_view() { }
+
+ virtual void
+ callchain(struct pmclog_ev_callchain &p,
+ ibsfetchinfo &f, __unused uintfptr_t *cc, __unused int len)
+ {
+ int usermode = PMC_CALLCHAIN_CPUFLAGS_TO_USERMODE(p.pl_cpuflags);
+
+ /* Ignore zeros */
+ if (IBS_FETCH_CTL_TO_LAT(f.ctl) == 0)
+ return;
+
+ auto inst = samples.find(f.linaddr);
+ if (inst == samples.end()) {
+ syminfo sym = addrtosymbol(usermode ? p.pl_pid : 0, f.linaddr);
+ if (sym.name == "")
+ return;
+
+ samples[f.linaddr] = frontend();
+ inst = samples.find(f.linaddr);
+ inst->second.func = sym;
+ }
+
+ /*
+ * Save fetch cache and TLB miss counts
+ */
+ if (f.ctl & IBS_FETCH_CTL_OPCACHEMISS)
+ inst->second.ocmiss += 1;
+ if (f.ctl & IBS_FETCH_CTL_L2MISS)
+ inst->second.l2miss += 1;
+ if (f.ctl & IBS_FETCH_CTL_L3MISS)
+ inst->second.l3miss += 1;
+
+ if (f.ctl & IBS_FETCH_CTL_L1TLBMISS)
+ inst->second.l1tlbmiss += 1;
+ if (f.ctl & IBS_FETCH_CTL_L2TLBMISS)
+ inst->second.l2tlbmiss += 1;
+
+ inst->second.latency += IBS_FETCH_CTL_TO_LAT(f.ctl);
+ inst->second.samples += 1;
+ }
+
+ virtual void
+ print()
+ {
+ title("IBS Frontend Analysis");
+
+ // Print header
+ table t = table();
+ t.addcolumn("Image", true);
+ t.addcolumn("Function", true);
+ t.addcolumn("Latency");
+ t.addcolumn("Samples");
+ t.addcolumn("OC Miss");
+ t.addcolumn("L2 Miss");
+ t.addcolumn("L3 Miss");
+ t.addcolumn("L1 TLB Miss");
+ t.addcolumn("L2 TLB Miss");
+
+ for (auto &kv : samples) {
+ std::vector<field> r;
+
+ r.emplace_back(kv.second.func.binary);
+ r.emplace_back(kv.second.func.to_string());
+ r.emplace_back(kv.second.latency);
+ r.emplace_back(kv.second.samples);
+ r.emplace_back(kv.second.ocmiss, kv.second.samples, true);
+ r.emplace_back(kv.second.l2miss, kv.second.samples, true);
+ r.emplace_back(kv.second.l3miss, kv.second.samples, true);
+ r.emplace_back(kv.second.l1tlbmiss, kv.second.samples, true);
+ r.emplace_back(kv.second.l2tlbmiss, kv.second.samples, true);
+
+ t.addrow(r);
+ }
+
+ t.sort(sortcol);
+ t.print();
+ }
+protected:
+ std::unordered_map<uint64_t, frontend> samples;
+};
+
+
+static struct option longopts[] = {
+ PMCFILTER_LOPTS,
+ { "sort", required_argument, NULL, 's' },
+ { NULL, 0, NULL, 0 }
+};
+
+static void
+usage(void)
+{
+ printf("Usage: pmc frontend [options] [pmclog]\n\n");
+ printf("Analyze frontend bottlenecks\n\n");
+ printf("Options:\n");
+ printf("\t-s,--sort Sort by event\n\n");
+ PMCFILTER_PRINTOPTS();
+}
+
+int
+cmd_pmc_frontend(int argc, char **argv)
+{
+ pmcfilter filter = pmcfilter();
+ const char *logfile = "default.log";
+ int option, logfd;
+
+ while ((option = getopt_long(argc, argv, PMCFILTER_SOPTS, longopts, NULL)) != -1) {
+ switch (option) {
+ PMCFILTER_CASE(filter)
+ case 's':
+ sortcol = atoi(optarg);
+ break;
+ case '?':
+ default:
+ usage();
+ exit(EX_USAGE);
+ }
+ }
+ argc -= optind;
+ argv += optind;
+ if (argc != 0 && argc != 1) {
+ usage();
+ exit(EX_USAGE);
+ }
+ if (argc == 1)
+ logfile = argv[0];
+
+ setup_screen();
+
+ if ((logfd = open(logfile, O_RDONLY)) < 0) {
+ errx(EX_OSERR, "ERROR: Cannot open \"%s\" for reading: %s.", logfile,
+ strerror(errno));
+ }
+
+ frontend_view v = frontend_view();
+ v.setfilter(filter);
+ v.process(logfd);
+ v.print();
+
+ close(logfd);
+
+ return (0);
+}
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