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authorDave Barach <dave@barachs.net>2018-09-10 12:31:15 -0400
committerDamjan Marion <dmarion@me.com>2018-10-22 12:02:04 +0000
commit4d1a866aff6ceb03025990b6e60b42faf09ef486 (patch)
treebec495932876d9649f26179b4c24b6938be43f38 /src/plugins/perfmon/perfmon_periodic.c
parent115a3ac59a16f9dcfee92eaecc79cd1fa3320e29 (diff)
X86_64 perf counter plugin
Change-Id: Ie5a00c15ee9536cc61afab57f6cadc1aa1972f3c Signed-off-by: Dave Barach <dave@barachs.net>
Diffstat (limited to 'src/plugins/perfmon/perfmon_periodic.c')
-rw-r--r--src/plugins/perfmon/perfmon_periodic.c433
1 files changed, 433 insertions, 0 deletions
diff --git a/src/plugins/perfmon/perfmon_periodic.c b/src/plugins/perfmon/perfmon_periodic.c
new file mode 100644
index 00000000000..329a75d7305
--- /dev/null
+++ b/src/plugins/perfmon/perfmon_periodic.c
@@ -0,0 +1,433 @@
+/*
+ * 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>
+
+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 u64
+read_current_perf_counter (vlib_main_t * vm)
+{
+ if (vm->perf_counter_id)
+ return clib_rdpmc (vm->perf_counter_id);
+ else
+ {
+ u64 sw_value;
+ if (read (vm->perf_counter_fd, &sw_value, sizeof (sw_value)) !=
+ sizeof (sw_value))
+ {
+ clib_unix_warning ("counter read failed, disable collection...");
+ vm->vlib_node_runtime_perf_counter_cb = 0;
+ return 0ULL;
+ }
+ return sw_value;
+ }
+}
+
+static void
+clear_counters (perfmon_main_t * pm)
+{
+ int i, j;
+ vlib_main_t *vm = pm->vlib_main;
+ vlib_main_t *stat_vm;
+ vlib_node_main_t *nm;
+ vlib_node_t *n;
+
+ 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;
+
+ nm = &stat_vm->node_main;
+
+ /* Clear the node runtime perfmon counters */
+ for (i = 0; i < vec_len (nm->nodes); i++)
+ {
+ n = nm->nodes[i];
+ vlib_node_sync_stats (stat_vm, n);
+ }
+
+ /* And clear the node perfmon counters */
+ for (i = 0; i < vec_len (nm->nodes); i++)
+ {
+ n = nm->nodes[i];
+ n->stats_total.perf_counter_ticks = 0;
+ n->stats_total.perf_counter_vectors = 0;
+ n->stats_last_clear.perf_counter_ticks = 0;
+ n->stats_last_clear.perf_counter_vectors = 0;
+ }
+ }
+ vlib_worker_thread_barrier_release (vm);
+}
+
+static void
+enable_current_event (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;
+
+ c = vec_elt_at_index (pm->events_to_collect, pm->current_event);
+
+ 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;
+ }
+
+ fd = perf_event_open (&pe, 0, -1, -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;
+ }
+ }
+
+ 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");
+
+ /*
+ * Software event counters - and others not capable of being
+ * read via the "rdpmc" instruction - will be read
+ * by system calls.
+ */
+ if (pe.type == PERF_TYPE_SOFTWARE || p->cap_user_rdpmc == 0)
+ pm->rdpmc_indices[my_thread_index] = 0;
+ else /* use rdpmc instrs */
+ pm->rdpmc_indices[my_thread_index] = p->index - 1;
+ pm->perf_event_pages[my_thread_index] = (void *) p;
+
+ pm->pm_fds[my_thread_index] = fd;
+
+ /* Enable the main loop counter snapshot mechanism */
+ vm->perf_counter_id = pm->rdpmc_indices[my_thread_index];
+ vm->perf_counter_fd = fd;
+ vm->vlib_node_runtime_perf_counter_cb = read_current_perf_counter;
+}
+
+static void
+disable_event (perfmon_main_t * pm)
+{
+ vlib_main_t *vm = vlib_get_main ();
+ u32 my_thread_index = vm->thread_index;
+
+ if (pm->pm_fds[my_thread_index] == 0)
+ return;
+
+ /* Stop main loop collection */
+ vm->vlib_node_runtime_perf_counter_cb = 0;
+
+ if (ioctl (pm->pm_fds[my_thread_index], PERF_EVENT_IOC_DISABLE, 0) < 0)
+ clib_unix_warning ("disable ioctl");
+
+ if (pm->perf_event_pages[my_thread_index])
+ if (munmap (pm->perf_event_pages[my_thread_index], pm->page_size) < 0)
+ clib_unix_warning ("munmap");
+
+ (void) close (pm->pm_fds[my_thread_index]);
+ pm->pm_fds[my_thread_index] = 0;
+}
+
+static void
+worker_thread_start_event (vlib_main_t * vm)
+{
+ perfmon_main_t *pm = &perfmon_main;
+
+ enable_current_event (pm);
+ vm->worker_thread_main_loop_callback = 0;
+}
+
+static void
+worker_thread_stop_event (vlib_main_t * vm)
+{
+ perfmon_main_t *pm = &perfmon_main;
+ disable_event (pm);
+ vm->worker_thread_main_loop_callback = 0;
+}
+
+static void
+start_event (perfmon_main_t * pm, f64 now, uword event_data)
+{
+ int i;
+ pm->current_event = 0;
+ if (vec_len (pm->events_to_collect) == 0)
+ {
+ pm->state = PERFMON_STATE_OFF;
+ return;
+ }
+ pm->state = PERFMON_STATE_RUNNING;
+ clear_counters (pm);
+
+ /* Start collection on this thread */
+ enable_current_event (pm);
+
+ /* And also on worker threads */
+ for (i = 1; i < vec_len (vlib_mains); i++)
+ {
+ if (vlib_mains[i] == 0)
+ continue;
+ vlib_mains[i]->worker_thread_main_loop_callback = (void *)
+ worker_thread_start_event;
+ }
+}
+
+void
+scrape_and_clear_counters (perfmon_main_t * pm)
+{
+ int i, j;
+ vlib_main_t *vm = pm->vlib_main;
+ vlib_main_t *stat_vm;
+ vlib_node_main_t *nm;
+ vlib_node_t ***node_dups = 0;
+ vlib_node_t **nodes;
+ vlib_node_t *n;
+ perfmon_capture_t *c;
+ perfmon_event_config_t *current_event;
+ uword *p;
+ u8 *counter_name;
+ u64 counter_value;
+ u64 vectors_this_counter;
+
+ /* 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;
+
+ nm = &stat_vm->node_main;
+
+ for (i = 0; i < vec_len (nm->nodes); i++)
+ {
+ n = nm->nodes[i];
+ vlib_node_sync_stats (stat_vm, n);
+ }
+
+ nodes = 0;
+ vec_validate (nodes, vec_len (nm->nodes) - 1);
+ vec_add1 (node_dups, nodes);
+
+ /* Snapshoot and clear the per-node perfmon counters */
+ for (i = 0; i < vec_len (nm->nodes); i++)
+ {
+ n = nm->nodes[i];
+ nodes[i] = clib_mem_alloc (sizeof (*n));
+ clib_memcpy (nodes[i], n, sizeof (*n));
+ n->stats_total.perf_counter_ticks = 0;
+ n->stats_total.perf_counter_vectors = 0;
+ n->stats_last_clear.perf_counter_ticks = 0;
+ n->stats_last_clear.perf_counter_vectors = 0;
+ }
+ }
+
+ vlib_worker_thread_barrier_release (vm);
+
+ current_event = pm->events_to_collect + pm->current_event;
+
+ for (j = 0; j < vec_len (vlib_mains); j++)
+ {
+ stat_vm = vlib_mains[j];
+ if (stat_vm == 0)
+ continue;
+
+ nodes = node_dups[j];
+
+ for (i = 0; i < vec_len (nodes); i++)
+ {
+ u8 *capture_name;
+
+ n = nodes[i];
+ if (n->stats_total.perf_counter_ticks == 0)
+ {
+ clib_mem_free (n);
+ continue;
+ }
+
+ capture_name = format (0, "t%d-%v%c", j, n->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]);
+
+ /* Snapshoot counters, etc. into the capture */
+ counter_name = (u8 *) current_event->name;
+ counter_value = n->stats_total.perf_counter_ticks -
+ n->stats_last_clear.perf_counter_ticks;
+ vectors_this_counter = n->stats_total.perf_counter_vectors -
+ n->stats_last_clear.perf_counter_vectors;
+
+ vec_add1 (c->counter_names, counter_name);
+ vec_add1 (c->counter_values, counter_value);
+ vec_add1 (c->vectors_this_counter, vectors_this_counter);
+ clib_mem_free (n);
+ }
+ vec_free (nodes);
+ }
+ vec_free (node_dups);
+}
+
+static void
+handle_timeout (perfmon_main_t * pm, f64 now)
+{
+ int i;
+ disable_event (pm);
+
+ /* And also on worker threads */
+ for (i = 1; i < vec_len (vlib_mains); i++)
+ {
+ if (vlib_mains[i] == 0)
+ continue;
+ vlib_mains[i]->worker_thread_main_loop_callback = (void *)
+ worker_thread_stop_event;
+ }
+
+ /* Short delay to make sure workers have stopped collection */
+ if (i > 1)
+ vlib_process_suspend (pm->vlib_main, 1e-3);
+ scrape_and_clear_counters (pm);
+ pm->current_event++;
+ if (pm->current_event >= vec_len (pm->events_to_collect))
+ {
+ pm->current_event = 0;
+ pm->state = PERFMON_STATE_OFF;
+ return;
+ }
+ enable_current_event (pm);
+
+ /* And also on worker threads */
+ for (i = 1; i < vec_len (vlib_mains); i++)
+ {
+ if (vlib_mains[i] == 0)
+ continue;
+ vlib_mains[i]->worker_thread_main_loop_callback = (void *)
+ worker_thread_start_event;
+ }
+}
+
+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 (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:
+ */