perfmon: fix pmc hw indices out-dated when multiple pmc - vpp

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author	Su Wang <su.z.wang@ericsson.com>	2019-03-21 00:14:14 -0400
committer	Damjan Marion <dmarion@me.com>	2019-03-26 11:44:43 +0000
commit	7297f47088274b0759dbef5d2c19d564d32521e6 (patch)
tree	0c3b7ddc6baec33e2503874f34aaebd40e12f320 /docs
parent	cb36a1dbaf29babb536bd10d0ff3ff35ca57bfa3 (diff)

perfmon: fix pmc hw indices out-dated when multiple pmc

When adding two or more events using a single "set pmc", the pmc hardware indices might be out-dated due to kernel reschdeduling the perf_event hardware counters. E.g. set pmc cpu-cycles cache-misses Solution: Open and enable all the events first, then aquire the indices from the kernel. Change-Id: I6913a871ab169e3b2855ac6159f527a1fca343e9 Signed-off-by: Su Wang <su.z.wang@ericsson.com>

Diffstat (limited to 'docs')

0 files changed, 0 insertions, 0 deletions

/* * Copyright (c) 2017 Cisco and/or its affiliates. * 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. */ #define _GNU_SOURCE #include <vnet/bonding/node.h> #include <vnet/ethernet/packet.h> #include <lacp/node.h> lacp_state_struct lacp_state_array[] = { #define _(b, s, n) {.bit = b, .str = #s, }, foreach_lacp_state_flag #undef _ {.str = NULL} }; /** \file 2 x LACP graph nodes: an "interior" node to process incoming announcements, and a "process" node to periodically send announcements. The interior node is neither pipelined nor dual-looped, because it would be very unusual to see more than one LACP packet in a given input frame. So, it's a very simple / straighforward example. */ /* * packet counter strings * Dump these counters via the "show error" CLI command */ static char *lacp_error_strings[] = { #define _(sym,string) string, foreach_lacp_error #undef _ }; /* * We actually send all lacp pkts to the "error" node after scanning * them, so the graph node has only one next-index. The "error-drop" * node automatically bumps our per-node packet counters for us. */ typedef enum { LACP_INPUT_NEXT_NORMAL, LACP_INPUT_N_NEXT, } lacp_next_t; /* * Process a frame of lacp packets * Expect 1 packet / frame */ static uword lacp_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) { u32 n_left_from, *from; lacp_input_trace_t *t0; from = vlib_frame_vector_args (frame); /* array of buffer indices */ n_left_from = frame->n_vectors; /* number of buffer indices */ while (n_left_from > 0) { u32 bi0; vlib_buffer_t *b0; u32 next0, error0; bi0 = from[0]; b0 = vlib_get_buffer (vm, bi0); next0 = LACP_INPUT_NEXT_NORMAL; /* scan this lacp pkt. error0 is the counter index to bump */ error0 = lacp_input (vm, b0, bi0); b0->error = node->errors[error0]; /* If this pkt is traced, snapshoot the data */ if (PREDICT_FALSE (node->flags & VLIB_NODE_FLAG_TRACE)) { int len; t0 = vlib_add_trace (vm, node, b0, sizeof (*t0)); len = (b0->current_length < sizeof (t0->pkt)) ? b0->current_length : sizeof (t0->pkt); t0->len = len; t0->sw_if_index = vnet_buffer (b0)->sw_if_index[VLIB_RX]; clib_memcpy_fast (&t0->pkt, vlib_buffer_get_current (b0), len); } /* push this pkt to the next graph node, always error-drop */ vlib_set_next_frame_buffer (vm, node, next0, bi0); from += 1; n_left_from -= 1; } return frame->n_vectors; } /* * lacp input graph node declaration */ /* *INDENT-OFF* */ VLIB_REGISTER_NODE (lacp_input_node, static) = { .function = lacp_node_fn, .name = "lacp-input", .vector_size = sizeof (u32), .type = VLIB_NODE_TYPE_INTERNAL, .n_errors = LACP_N_ERROR, .error_strings = lacp_error_strings, .format_trace = lacp_input_format_trace, .n_next_nodes = LACP_INPUT_N_NEXT, .next_nodes = { [LACP_INPUT_NEXT_NORMAL] = "error-drop", }, }; /* *INDENT-ON* */ static void lacp_elog_start_event (void) { lacp_main_t *lm = &lacp_main; /* *INDENT-OFF* */ ELOG_TYPE_DECLARE (e) = { .format = "Starting LACP process, interface count = %d", .format_args = "i4", }; /* *INDENT-ON* */ struct { u32 count; } *ed; ed = ELOG_DATA (&vlib_global_main.elog_main, e); ed->count = lm->lacp_int; } static void lacp_elog_stop_event (void) { lacp_main_t *lm = &lacp_main; /* *INDENT-OFF* */ ELOG_TYPE_DECLARE (e) = { .format = "Stopping LACP process, interface count = %d", .format_args = "i4", }; /* *INDENT-ON* */ struct { u32 count; } *ed; ed = ELOG_DATA (&vlib_global_main.elog_main, e); ed->count = lm->lacp_int; } /* * lacp periodic function */ static uword lacp_process (vlib_main_t * vm, vlib_node_runtime_t * rt, vlib_frame_t * f) { lacp_main_t *lm = &lacp_main; f64 poll_time_remaining; uword event_type, *event_data = 0; ethernet_register_input_type (vm, ETHERNET_TYPE_SLOW_PROTOCOLS /* LACP */ , lacp_input_node.index); poll_time_remaining = 0.2; while (1) { if (lm->lacp_int > 0) poll_time_remaining = vlib_process_wait_for_event_or_clock (vm, poll_time_remaining); else vlib_process_wait_for_event (vm); event_type = vlib_process_get_events (vm, &event_data); switch (event_type) { case ~0: /* no events => timeout */ break; case LACP_PROCESS_EVENT_START: poll_time_remaining = 0.2; lacp_elog_start_event (); break; case LACP_PROCESS_EVENT_STOP: if (lm->lacp_int == 0) { poll_time_remaining = SECS_IN_A_DAY; lacp_elog_stop_event (); } break; default: clib_warning ("BUG: event type 0x%wx", event_type); break; } vec_reset_length (event_data); if (vlib_process_suspend_time_is_zero (poll_time_remaining)) { lacp_periodic (vm); poll_time_remaining = 0.2; } } return 0; } void lacp_create_periodic_process (void) { lacp_main_t *lm = &lacp_main; /* Already created the process node? */ if (lm->lacp_process_node_index > 0) return; /* No, create it now and make a note of the node index */ lm->lacp_process_node_index = vlib_process_create (lm->vlib_main, "lacp-process", lacp_process, 16 /* log2_n_stack_bytes */ ); } /* * fd.io coding-style-patch-verification: ON * * Local Variables: * eval: (c-set-style "gnu") * End: */


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