--- /dev/null
+/*
+ * perfmon_periodic.c - skeleton plug-in periodic function
+ *
+ * Copyright (c) <current-year> <your-organization>
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <vlib/vlib.h>
+#include <vppinfra/error.h>
+#include <perfmon/perfmon.h>
+#include <asm/unistd.h>
+#include <sys/ioctl.h>
+
+/* "not in glibc" */
+static long
+perf_event_open (struct perf_event_attr *hw_event, pid_t pid, int cpu,
+ int group_fd, unsigned long flags)
+{
+ int ret;
+
+ ret = syscall (__NR_perf_event_open, hw_event, pid, cpu, group_fd, flags);
+ return ret;
+}
+
+static void
+read_current_perf_counters (vlib_node_runtime_perf_callback_data_t * data,
+ vlib_node_runtime_perf_callback_args_t * args)
+{
+ int i;
+ perfmon_main_t *pm = &perfmon_main;
+ perfmon_thread_t *pt = data->u[0].v;
+ u64 c[2] = { 0, 0 };
+ u64 *cc;
+
+ if (PREDICT_FALSE (args->call_type == VLIB_NODE_RUNTIME_PERF_RESET))
+ return;
+
+ if (args->call_type == VLIB_NODE_RUNTIME_PERF_BEFORE)
+ cc = pt->c;
+ else
+ cc = c;
+
+ for (i = 0; i < pm->n_active; i++)
+ {
+ if (pt->rdpmc_indices[i] != ~0)
+ cc[i] = clib_rdpmc ((int) pt->rdpmc_indices[i]);
+ else
+ {
+ u64 sw_value;
+ int read_result;
+ if ((read_result = read (pt->pm_fds[i], &sw_value,
+ sizeof (sw_value))) != sizeof (sw_value))
+ {
+ clib_unix_warning
+ ("counter read returned %d, expected %d",
+ read_result, sizeof (sw_value));
+ clib_callback_data_enable_disable
+ (&args->vm->vlib_node_runtime_perf_callbacks,
+ read_current_perf_counters, 0 /* enable */ );
+ return;
+ }
+ cc[i] = sw_value;
+ }
+ }
+
+ if (args->call_type == VLIB_NODE_RUNTIME_PERF_AFTER)
+ {
+ u32 node_index = args->node->node_index;
+ vec_validate (pt->counters, node_index);
+ pt->counters[node_index].ticks[0] += c[0] - pt->c[0];
+ pt->counters[node_index].ticks[1] += c[1] - pt->c[1];
+ pt->counters[node_index].vectors += args->packets;
+ }
+}
+
+static void
+clear_counters (perfmon_main_t * pm)
+{
+ int j;
+ vlib_main_t *vm = pm->vlib_main;
+ vlib_main_t *stat_vm;
+ perfmon_thread_t *pt;
+ u32 len;
+
+
+ vlib_worker_thread_barrier_sync (vm);
+
+ for (j = 0; j < vec_len (vlib_mains); j++)
+ {
+ stat_vm = vlib_mains[j];
+ if (stat_vm == 0)
+ continue;
+
+ pt = pm->threads[j];
+ len = vec_len (pt->counters);
+ if (!len)
+ continue;
+
+ clib_memset (pt->counters, 0, len * sizeof (pt->counters[0]));
+ }
+ vlib_worker_thread_barrier_release (vm);
+}
+
+static void
+enable_current_events (perfmon_main_t * pm)
+{
+ struct perf_event_attr pe;
+ int fd;
+ struct perf_event_mmap_page *p = 0;
+ perfmon_event_config_t *c;
+ vlib_main_t *vm = vlib_get_main ();
+ u32 my_thread_index = vm->thread_index;
+ perfmon_thread_t *pt = pm->threads[my_thread_index];
+ u32 index;
+ int i, limit = 1;
+ int cpu;
+ vlib_node_runtime_perf_callback_data_t cbdata = { 0 };
+ cbdata.fp = read_current_perf_counters;
+ cbdata.u[0].v = pt;
+ cbdata.u[1].v = vm;
+
+ if ((pm->current_event + 1) < vec_len (pm->single_events_to_collect))
+ limit = 2;
+
+ for (i = 0; i < limit; i++)
+ {
+ c = vec_elt_at_index (pm->single_events_to_collect,
+ pm->current_event + i);
+
+ memset (&pe, 0, sizeof (struct perf_event_attr));
+ pe.type = c->pe_type;
+ pe.size = sizeof (struct perf_event_attr);
+ pe.config = c->pe_config;
+ pe.disabled = 1;
+ pe.pinned = 1;
+ /*
+ * Note: excluding the kernel makes the
+ * (software) context-switch counter read 0...
+ */
+ if (pe.type != PERF_TYPE_SOFTWARE)
+ {
+ /* Exclude kernel and hypervisor */
+ pe.exclude_kernel = 1;
+ pe.exclude_hv = 1;
+ }
+
+ cpu = vm->cpu_id;
+
+ fd = perf_event_open (&pe, 0, cpu, -1, 0);
+ if (fd == -1)
+ {
+ clib_unix_warning ("event open: type %d config %d", c->pe_type,
+ c->pe_config);
+ return;
+ }
+
+ if (pe.type != PERF_TYPE_SOFTWARE)
+ {
+ p = mmap (0, pm->page_size, PROT_READ, MAP_SHARED, fd, 0);
+ if (p == MAP_FAILED)
+ {
+ clib_unix_warning ("mmap");
+ close (fd);
+ return;
+ }
+ CLIB_MEM_UNPOISON (p, pm->page_size);
+ }
+ else
+ p = 0;
+
+ if (ioctl (fd, PERF_EVENT_IOC_RESET, 0) < 0)
+ clib_unix_warning ("reset ioctl");
+
+ if (ioctl (fd, PERF_EVENT_IOC_ENABLE, 0) < 0)
+ clib_unix_warning ("enable ioctl");
+
+ pt->perf_event_pages[i] = (void *) p;
+ pt->pm_fds[i] = fd;
+ }
+
+ /*
+ * Hardware events must be all opened and enabled before aquiring
+ * pmc indices, otherwise the pmc indices might be out-dated.
+ */
+ for (i = 0; i < limit; i++)
+ {
+ p = (struct perf_event_mmap_page *) pt->perf_event_pages[i];
+
+ /*
+ * Software event counters - and others not capable of being
+ * read via the "rdpmc" instruction - will be read
+ * by system calls.
+ */
+ if (p == 0 || p->cap_user_rdpmc == 0)
+ index = ~0;
+ else
+ index = p->index - 1;
+
+ pt->rdpmc_indices[i] = index;
+ }
+
+ pm->n_active = i;
+ /* Enable the main loop counter snapshot mechanism */
+ clib_callback_data_add (&vm->vlib_node_runtime_perf_callbacks, cbdata);
+}
+
+static void
+disable_events (perfmon_main_t * pm)
+{
+ vlib_main_t *vm = vlib_get_main ();
+ u32 my_thread_index = vm->thread_index;
+ perfmon_thread_t *pt = pm->threads[my_thread_index];
+ int i;
+
+ /* Stop main loop collection */
+ clib_callback_data_remove (&vm->vlib_node_runtime_perf_callbacks,
+ read_current_perf_counters);
+
+ for (i = 0; i < pm->n_active; i++)
+ {
+ if (pt->pm_fds[i] == 0)
+ continue;
+
+ if (ioctl (pt->pm_fds[i], PERF_EVENT_IOC_DISABLE, 0) < 0)
+ clib_unix_warning ("disable ioctl");
+
+ if (pt->perf_event_pages[i])
+ {
+ if (munmap (pt->perf_event_pages[i], pm->page_size) < 0)
+ clib_unix_warning ("munmap");
+ pt->perf_event_pages[i] = 0;
+ }
+
+ (void) close (pt->pm_fds[i]);
+ pt->pm_fds[i] = 0;
+ }
+}
+
+static void
+worker_thread_start_event (vlib_main_t * vm)
+{
+ perfmon_main_t *pm = &perfmon_main;
+
+ clib_callback_enable_disable (vm->worker_thread_main_loop_callbacks,
+ vm->worker_thread_main_loop_callback_tmp,
+ vm->worker_thread_main_loop_callback_lock,
+ worker_thread_start_event, 0 /* disable */ );
+ enable_current_events (pm);
+}
+
+static void
+worker_thread_stop_event (vlib_main_t * vm)
+{
+ perfmon_main_t *pm = &perfmon_main;
+ clib_callback_enable_disable (vm->worker_thread_main_loop_callbacks,
+ vm->worker_thread_main_loop_callback_tmp,
+ vm->worker_thread_main_loop_callback_lock,
+ worker_thread_stop_event, 0 /* disable */ );
+ disable_events (pm);
+}
+
+static void
+start_event (perfmon_main_t * pm, f64 now, uword event_data)
+{
+ int i;
+ int last_set;
+ int all = 0;
+ pm->current_event = 0;
+
+ if (vec_len (pm->single_events_to_collect) == 0)
+ {
+ pm->state = PERFMON_STATE_OFF;
+ return;
+ }
+
+ last_set = clib_bitmap_last_set (pm->thread_bitmap);
+ all = (last_set == ~0);
+
+ pm->state = PERFMON_STATE_RUNNING;
+ clear_counters (pm);
+
+ /* Start collection on thread 0? */
+ if (all || clib_bitmap_get (pm->thread_bitmap, 0))
+ {
+ /* Start collection on this thread */
+ enable_current_events (pm);
+ }
+
+ /* And also on worker threads */
+ for (i = 1; i < vec_len (vlib_mains); i++)
+ {
+ if (vlib_mains[i] == 0)
+ continue;
+
+ if (all || clib_bitmap_get (pm->thread_bitmap, i))
+ clib_callback_enable_disable
+ (vlib_mains[i]->worker_thread_main_loop_callbacks,
+ vlib_mains[i]->worker_thread_main_loop_callback_tmp,
+ vlib_mains[i]->worker_thread_main_loop_callback_lock,
+ (void *) worker_thread_start_event, 1 /* enable */ );
+ }
+}
+
+void
+scrape_and_clear_counters (perfmon_main_t * pm)
+{
+ int i, j, k;
+ vlib_main_t *vm = pm->vlib_main;
+ vlib_main_t *stat_vm;
+ vlib_node_main_t *nm;
+ perfmon_counters_t *ctr;
+ perfmon_counters_t *ctrs;
+ perfmon_counters_t **ctr_dups = 0;
+ perfmon_thread_t *pt;
+ perfmon_capture_t *c;
+ perfmon_event_config_t *current_event;
+ uword *p;
+ u8 *counter_name;
+ u32 len;
+
+ /* snapshoot the nodes, including pm counters */
+ vlib_worker_thread_barrier_sync (vm);
+
+ for (j = 0; j < vec_len (vlib_mains); j++)
+ {
+ stat_vm = vlib_mains[j];
+ if (stat_vm == 0)
+ continue;
+
+ pt = pm->threads[j];
+ len = vec_len (pt->counters);
+ ctrs = 0;
+ if (len)
+ {
+ vec_validate (ctrs, len - 1);
+ clib_memcpy (ctrs, pt->counters, len * sizeof (pt->counters[0]));
+ clib_memset (pt->counters, 0, len * sizeof (pt->counters[0]));
+ }
+ vec_add1 (ctr_dups, ctrs);
+ }
+
+ vlib_worker_thread_barrier_release (vm);
+
+ for (j = 0; j < vec_len (vlib_mains); j++)
+ {
+ stat_vm = vlib_mains[j];
+ if (stat_vm == 0)
+ continue;
+
+ pt = pm->threads[j];
+ ctrs = ctr_dups[j];
+
+ for (i = 0; i < vec_len (ctrs); i++)
+ {
+ u8 *capture_name;
+
+ ctr = &ctrs[i];
+ nm = &stat_vm->node_main;
+
+ if (ctr->ticks[0] == 0 && ctr->ticks[1] == 0)
+ continue;
+
+ for (k = 0; k < 2; k++)
+ {
+ /*
+ * We collect 2 counters at once, except for the
+ * last counter when the user asks for an odd number of
+ * counters
+ */
+ if ((pm->current_event + k)
+ >= vec_len (pm->single_events_to_collect))
+ break;
+
+ capture_name = format (0, "t%d-%v%c", j, nm->nodes[i]->name, 0);
+
+ p = hash_get_mem (pm->capture_by_thread_and_node_name,
+ capture_name);
+
+ if (p == 0)
+ {
+ pool_get (pm->capture_pool, c);
+ memset (c, 0, sizeof (*c));
+ c->thread_and_node_name = capture_name;
+ hash_set_mem (pm->capture_by_thread_and_node_name,
+ capture_name, c - pm->capture_pool);
+ }
+ else
+ {
+ c = pool_elt_at_index (pm->capture_pool, p[0]);
+ vec_free (capture_name);
+ }
+
+ /* Snapshoot counters, etc. into the capture */
+ current_event = pm->single_events_to_collect
+ + pm->current_event + k;
+ counter_name = (u8 *) current_event->name;
+
+ vec_add1 (c->counter_names, counter_name);
+ vec_add1 (c->counter_values, ctr->ticks[k]);
+ vec_add1 (c->vectors_this_counter, ctr->vectors);
+ }
+ }
+ vec_free (ctrs);
+ }
+ vec_free (ctr_dups);
+}
+
+static void
+handle_timeout (vlib_main_t * vm, perfmon_main_t * pm, f64 now)
+{
+ int i;
+ int last_set, all;
+
+ last_set = clib_bitmap_last_set (pm->thread_bitmap);
+ all = (last_set == ~0);
+
+ if (all || clib_bitmap_get (pm->thread_bitmap, 0))
+ disable_events (pm);
+
+ /* And also on worker threads */
+ for (i = 1; i < vec_len (vlib_mains); i++)
+ {
+ if (vlib_mains[i] == 0)
+ continue;
+ if (all || clib_bitmap_get (pm->thread_bitmap, i))
+ clib_callback_enable_disable
+ (vlib_mains[i]->worker_thread_main_loop_callbacks,
+ vlib_mains[i]->worker_thread_main_loop_callback_tmp,
+ vlib_mains[i]->worker_thread_main_loop_callback_lock,
+ (void *) worker_thread_stop_event, 1 /* enable */ );
+ }
+
+ /* Make sure workers have stopped collection */
+ if (i > 1)
+ {
+ f64 deadman = vlib_time_now (vm) + 1.0;
+
+ for (i = 1; i < vec_len (vlib_mains); i++)
+ {
+ /* Has the worker actually stopped collecting data? */
+ while (clib_callback_data_is_set
+ (&vm->vlib_node_runtime_perf_callbacks,
+ read_current_perf_counters))
+ {
+ if (vlib_time_now (vm) > deadman)
+ {
+ clib_warning ("Thread %d deadman timeout!", i);
+ break;
+ }
+ vlib_process_suspend (pm->vlib_main, 1e-3);
+ }
+ }
+ }
+ scrape_and_clear_counters (pm);
+ pm->current_event += pm->n_active;
+ if (pm->current_event >= vec_len (pm->single_events_to_collect))
+ {
+ pm->current_event = 0;
+ pm->state = PERFMON_STATE_OFF;
+ return;
+ }
+
+ if (all || clib_bitmap_get (pm->thread_bitmap, 0))
+ enable_current_events (pm);
+
+ /* And also on worker threads */
+ for (i = 1; i < vec_len (vlib_mains); i++)
+ {
+ if (vlib_mains[i] == 0)
+ continue;
+ if (all || clib_bitmap_get (pm->thread_bitmap, i))
+ clib_callback_enable_disable
+ (vlib_mains[i]->worker_thread_main_loop_callbacks,
+ vlib_mains[i]->worker_thread_main_loop_callback_tmp,
+ vlib_mains[i]->worker_thread_main_loop_callback_lock,
+ worker_thread_start_event, 0 /* disable */ );
+ }
+}
+
+static uword
+perfmon_periodic_process (vlib_main_t * vm,
+ vlib_node_runtime_t * rt, vlib_frame_t * f)
+{
+ perfmon_main_t *pm = &perfmon_main;
+ f64 now;
+ uword *event_data = 0;
+ uword event_type;
+ int i;
+
+ while (1)
+ {
+ if (pm->state == PERFMON_STATE_RUNNING)
+ vlib_process_wait_for_event_or_clock (vm, pm->timeout_interval);
+ else
+ vlib_process_wait_for_event (vm);
+
+ now = vlib_time_now (vm);
+
+ event_type = vlib_process_get_events (vm, (uword **) & event_data);
+
+ switch (event_type)
+ {
+ case PERFMON_START:
+ for (i = 0; i < vec_len (event_data); i++)
+ start_event (pm, now, event_data[i]);
+ break;
+
+ /* Handle timeout */
+ case ~0:
+ handle_timeout (vm, pm, now);
+ break;
+
+ default:
+ clib_warning ("Unexpected event %d", event_type);
+ break;
+ }
+ vec_reset_length (event_data);
+ }
+ return 0; /* or not */
+}
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (perfmon_periodic_node) =
+{
+ .function = perfmon_periodic_process,
+ .type = VLIB_NODE_TYPE_PROCESS,
+ .name = "perfmon-periodic-process",
+};
+/* *INDENT-ON* */
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */
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