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 void 33 0 : balance(struct spdk_scheduler_core_info *cores, uint32_t core_count) 34 : { 35 : struct spdk_governor *governor; 36 : struct spdk_scheduler_core_info *core; 37 0 : struct spdk_governor_capabilities capabilities; 38 : uint64_t total_tsc; 39 : uint32_t busy_pct; 40 : uint32_t i; 41 : int rc; 42 : 43 0 : governor = spdk_governor_get(); 44 0 : assert(governor != NULL); 45 : 46 : /* Gather active/idle statistics */ 47 0 : SPDK_ENV_FOREACH_CORE(i) { 48 0 : core = &cores[i]; 49 : 50 0 : rc = governor->get_core_capabilities(core->lcore, &capabilities); 51 0 : if (rc < 0) { 52 0 : SPDK_ERRLOG("failed to get capabilities for core: %u\n", core->lcore); 53 0 : return; 54 : } 55 : 56 0 : total_tsc = core->current_busy_tsc + core->current_idle_tsc; 57 0 : busy_pct = core->current_busy_tsc * 100 / total_tsc; 58 : 59 0 : if (busy_pct < g_min_threshold) { 60 0 : rc = governor->set_core_freq_min(core->lcore); 61 0 : if (rc < 0) { 62 0 : SPDK_ERRLOG("setting to minimal frequency for core %u failed\n", core->lcore); 63 : } 64 0 : } else if (busy_pct < g_adjust_threshold) { 65 0 : rc = governor->core_freq_down(core->lcore); 66 0 : if (rc < 0) { 67 0 : SPDK_ERRLOG("lowering frequency for core %u failed\n", core->lcore); 68 : } 69 0 : } else if (busy_pct >= g_max_threshold) { 70 0 : rc = governor->set_core_freq_max(core->lcore); 71 0 : if (rc < 0) { 72 0 : SPDK_ERRLOG("setting to maximal frequency for core %u failed\n", core->lcore); 73 : } 74 : } else { 75 0 : rc = governor->core_freq_up(core->lcore); 76 0 : if (rc < 0) { 77 0 : SPDK_ERRLOG("increasing frequency for core %u failed\n", core->lcore); 78 : } 79 : } 80 : } 81 : } 82 : 83 : static struct spdk_scheduler gscheduler = { 84 : .name = "gscheduler", 85 : .init = init, 86 : .deinit = deinit, 87 : .balance = balance, 88 : }; 89 : 90 0 : SPDK_SCHEDULER_REGISTER(gscheduler);