LCOV - code coverage report
Current view: top level - module/scheduler/gscheduler - gscheduler.c (source / functions) Hit Total Coverage
Test: ut_cov_unit.info Lines: 0 46 0.0 %
Date: 2024-07-14 14:40:12 Functions: 0 6 0.0 %

          Line data    Source code
       1             : /*   SPDX-License-Identifier: BSD-3-Clause
       2             :  *   Copyright (C) 2021 Intel Corporation.
       3             :  *   All rights reserved.
       4             :  */
       5             : 
       6             : #include "spdk/stdinc.h"
       7             : #include "spdk/likely.h"
       8             : 
       9             : #include "spdk_internal/event.h"
      10             : #include "spdk/thread.h"
      11             : 
      12             : #include "spdk/log.h"
      13             : #include "spdk/env.h"
      14             : #include "spdk/scheduler.h"
      15             : 
      16             : static uint32_t g_max_threshold = 99;
      17             : static uint32_t g_adjust_threshold = 50;
      18             : static uint32_t g_min_threshold = 1;
      19             : 
      20             : static int
      21           0 : init(void)
      22             : {
      23           0 :         return spdk_governor_set("dpdk_governor");
      24             : }
      25             : 
      26             : static void
      27           0 : deinit(void)
      28             : {
      29           0 :         spdk_governor_set(NULL);
      30           0 : }
      31             : 
      32             : static uint32_t
      33           0 : calculate_busy_pct(struct spdk_scheduler_core_info *core)
      34             : {
      35             :         uint64_t total_tsc;
      36             : 
      37           0 :         total_tsc = core->current_busy_tsc + core->current_idle_tsc;
      38           0 :         return core->current_busy_tsc * 100 / total_tsc;
      39             : }
      40             : 
      41             : struct check_sibling_ctx {
      42             :         struct spdk_scheduler_core_info *cores;
      43             :         uint32_t busy_pct;
      44             : };
      45             : 
      46             : static void
      47           0 : check_sibling(void *_ctx, uint32_t i)
      48             : {
      49           0 :         struct check_sibling_ctx *ctx = _ctx;
      50           0 :         struct spdk_scheduler_core_info *core = &ctx->cores[i];
      51           0 :         uint32_t busy_pct = calculate_busy_pct(core);
      52             : 
      53           0 :         ctx->busy_pct = spdk_max(ctx->busy_pct, busy_pct);
      54           0 : }
      55             : 
      56             : static void
      57           0 : balance(struct spdk_scheduler_core_info *cores, uint32_t core_count)
      58             : {
      59             :         struct spdk_governor *governor;
      60             :         struct spdk_scheduler_core_info *core;
      61           0 :         struct spdk_governor_capabilities capabilities;
      62             :         uint32_t busy_pct;
      63             :         uint32_t i;
      64             :         int rc;
      65             : 
      66           0 :         governor = spdk_governor_get();
      67           0 :         assert(governor != NULL);
      68             : 
      69             :         /* Gather active/idle statistics */
      70           0 :         SPDK_ENV_FOREACH_CORE(i) {
      71           0 :                 struct spdk_cpuset smt_siblings = {};
      72           0 :                 core = &cores[i];
      73             : 
      74           0 :                 rc = governor->get_core_capabilities(core->lcore, &capabilities);
      75           0 :                 if (rc < 0) {
      76           0 :                         SPDK_ERRLOG("failed to get capabilities for core: %u\n", core->lcore);
      77           0 :                         return;
      78             :                 }
      79             : 
      80           0 :                 busy_pct = calculate_busy_pct(core);
      81           0 :                 if (spdk_env_core_get_smt_cpuset(&smt_siblings, i)) {
      82           0 :                         struct check_sibling_ctx ctx = {.cores = cores, .busy_pct = busy_pct};
      83             : 
      84           0 :                         spdk_cpuset_for_each_cpu(&smt_siblings, check_sibling, &ctx);
      85           0 :                         busy_pct = ctx.busy_pct;
      86             :                 }
      87             : 
      88           0 :                 if (busy_pct < g_min_threshold) {
      89           0 :                         rc = governor->set_core_freq_min(core->lcore);
      90           0 :                         if (rc < 0) {
      91           0 :                                 SPDK_ERRLOG("setting to minimal frequency for core %u failed\n", core->lcore);
      92             :                         }
      93           0 :                 } else if (busy_pct < g_adjust_threshold) {
      94           0 :                         rc = governor->core_freq_down(core->lcore);
      95           0 :                         if (rc < 0) {
      96           0 :                                 SPDK_ERRLOG("lowering frequency for core %u failed\n", core->lcore);
      97             :                         }
      98           0 :                 } else if (busy_pct >= g_max_threshold) {
      99           0 :                         rc = governor->set_core_freq_max(core->lcore);
     100           0 :                         if (rc < 0) {
     101           0 :                                 SPDK_ERRLOG("setting to maximal frequency for core %u failed\n", core->lcore);
     102             :                         }
     103             :                 } else {
     104           0 :                         rc = governor->core_freq_up(core->lcore);
     105           0 :                         if (rc < 0) {
     106           0 :                                 SPDK_ERRLOG("increasing frequency for core %u failed\n", core->lcore);
     107             :                         }
     108             :                 }
     109             :         }
     110             : }
     111             : 
     112             : static struct spdk_scheduler gscheduler = {
     113             :         .name = "gscheduler",
     114             :         .init = init,
     115             :         .deinit = deinit,
     116             :         .balance = balance,
     117             : };
     118             : 
     119           0 : SPDK_SCHEDULER_REGISTER(gscheduler);

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