LCOV - code coverage report
Current view: top level - spdk/module/scheduler/gscheduler - gscheduler.c (source / functions) Hit Total Coverage
Test: Combined Lines: 1 33 3.0 %
Date: 2024-07-16 01:28:49 Functions: 1 4 25.0 %
Legend: Lines: hit not hit | Branches: + taken - not taken # not executed Branches: 0 22 0.0 %

           Branch data     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                 :       2130 : SPDK_SCHEDULER_REGISTER(gscheduler);

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