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scheduler_dynamic: add core_stats

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Added core_stats structure that will hold stats modified
during balancing.

Further patches will modify the values in this structure,
to for example judge how much execution time a core
has left.

Signed-off-by: Maciej Szwed <maciej.szwed@intel.com>
Signed-off-by: Tomasz Zawadzki <tomasz.zawadzki@intel.com>
Change-Id: Ib8e611e36642c4543b5cb43bc2695c613d38f0fc
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/6657
Reviewed-by: Jim Harris <james.r.harris@intel.com>
Reviewed-by: Shuhei Matsumoto <shuhei.matsumoto.xt@hitachi.com>
Reviewed-by: Konrad Sztyber <konrad.sztyber@intel.com>
Community-CI: Mellanox Build Bot
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
This commit is contained in:
Maciej Szwed 2021-03-03 13:32:51 +01:00 committed by Tomasz Zawadzki
parent abbfa1a5d1
commit 4324834113
1 changed files with 28 additions and 13 deletions
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41
lib/event/scheduler_dynamic.c
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@ -44,6 +44,13 @@ static uint32_t g_next_lcore = SPDK_ENV_LCORE_ID_ANY;
static uint32_t g_main_lcore;
static bool g_core_mngmnt_available;
struct core_stats {
uint64_t busy;
uint64_t idle;
};
static struct core_stats *g_cores;
#define SCHEDULER_THREAD_BUSY 100
#define SCHEDULER_LOAD_LIMIT 50
@ -88,6 +95,12 @@ init(struct spdk_governor *governor)
rc = _spdk_governor_set("dpdk_governor");
g_core_mngmnt_available = !rc;
g_cores = calloc(spdk_env_get_last_core() + 1, sizeof(struct core_stats));
if (g_cores == NULL) {
SPDK_ERRLOG("Failed to allocate memory for dynamic scheduler core stats.\n");
return -ENOMEM;
}
return 0;
}
@ -97,6 +110,9 @@ deinit(struct spdk_governor *governor)
uint32_t i;
int rc = 0;
free(g_cores);
g_cores = NULL;
if (!g_core_mngmnt_available) {
return 0;
}
@ -126,8 +142,7 @@ balance(struct spdk_scheduler_core_info *cores_info, int cores_count,
struct spdk_thread *thread;
struct spdk_scheduler_core_info *core;
struct spdk_cpuset *cpumask;
uint64_t main_core_busy;
uint64_t main_core_idle;
struct core_stats *main_core;
uint64_t thread_busy;
uint32_t target_lcore;
uint32_t i, j, k;
@ -135,12 +150,12 @@ balance(struct spdk_scheduler_core_info *cores_info, int cores_count,
uint8_t load;
bool busy_threads_present = false;
main_core_busy = cores_info[g_main_lcore].current_busy_tsc;
main_core_idle = cores_info[g_main_lcore].current_idle_tsc;
SPDK_ENV_FOREACH_CORE(i) {
cores_info[i].pending_threads_count = cores_info[i].threads_count;
g_cores[i].busy = cores_info[i].current_busy_tsc;
g_cores[i].idle = cores_info[i].current_idle_tsc;
}
main_core = &g_cores[g_main_lcore];
/* Distribute active threads across all cores and move idle threads to main core */
SPDK_ENV_FOREACH_CORE(i) {
@ -161,7 +176,7 @@ balance(struct spdk_scheduler_core_info *cores_info, int cores_count,
target_lcore = _get_next_target_core();
/* Do not use main core if it is too busy for new thread */
if (target_lcore == g_main_lcore && thread_busy > main_core_idle) {
if (target_lcore == g_main_lcore && thread_busy > main_core->idle) {
continue;
}
@ -172,8 +187,8 @@ balance(struct spdk_scheduler_core_info *cores_info, int cores_count,
if (target_lcore != g_main_lcore) {
busy_threads_present = true;
main_core_idle += spdk_min(UINT64_MAX - main_core_idle, thread_busy);
main_core_busy -= spdk_min(main_core_busy, thread_busy);
main_core->idle += spdk_min(UINT64_MAX - main_core->idle, thread_busy);
main_core->busy -= spdk_min(main_core->busy, thread_busy);
}
break;
@ -185,8 +200,8 @@ balance(struct spdk_scheduler_core_info *cores_info, int cores_count,
cores_info[g_main_lcore].pending_threads_count++;
core->pending_threads_count--;
main_core_busy += spdk_min(UINT64_MAX - main_core_busy, thread_busy);
main_core_idle -= spdk_min(main_core_idle, thread_busy);
main_core->busy += spdk_min(UINT64_MAX - main_core->busy, thread_busy);
main_core->idle -= spdk_min(main_core->idle, thread_busy);
} else {
/* Move busy thread only if cpumask does not match current core (except main core) */
if (i != g_main_lcore) {
@ -200,8 +215,8 @@ balance(struct spdk_scheduler_core_info *cores_info, int cores_count,
core->pending_threads_count--;
if (target_lcore == g_main_lcore) {
main_core_busy += spdk_min(UINT64_MAX - main_core_busy, thread_busy);
main_core_idle -= spdk_min(main_core_idle, thread_busy);
main_core->busy += spdk_min(UINT64_MAX - main_core->busy, thread_busy);
main_core->idle -= spdk_min(main_core->idle, thread_busy);
}
break;
}
@ -237,7 +252,7 @@ balance(struct spdk_scheduler_core_info *cores_info, int cores_count,
if (rc < 0) {
SPDK_ERRLOG("setting default frequency for core %u failed\n", g_main_lcore);
}
} else if (main_core_busy > main_core_idle) {
} else if (main_core->busy > main_core->idle) {
rc = governor->core_freq_up(g_main_lcore);
if (rc < 0) {
SPDK_ERRLOG("increasing frequency for core %u failed\n", g_main_lcore);