Commit e742a414 authored by Maciej Szwed's avatar Maciej Szwed Committed by Tomasz Zawadzki
Browse files

schedulers: Switch to interrupt mode if core is unused 



Save CPU resources by switching reactors w/o any
threads to interrupt mode.

Signed-off-by: default avatarMaciej Szwed <maciej.szwed@intel.com>
Change-Id: Ibd1c1d50d1f6c6d7ed226d585e14999c2fd04621
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/5456


Reviewed-by: default avatarTomasz Zawadzki <tomasz.zawadzki@intel.com>
Reviewed-by: default avatarJim Harris <james.r.harris@intel.com>
Tested-by: default avatarSPDK CI Jenkins <sys_sgci@intel.com>
parent 6859a49a

lib/event/scheduler_dynamic.c

+14 −0
Original line number Diff line number Diff line
@@ -109,6 +109,7 @@ static void 
balance(struct spdk_scheduler_core_info *cores_info, int cores_count,

	struct spdk_governor *governor)

{

	struct spdk_reactor *reactor;

	struct spdk_lw_thread *lw_thread;

	struct spdk_thread *thread;

	struct spdk_scheduler_core_info *core;
@@ -202,6 +203,19 @@ balance(struct spdk_scheduler_core_info *cores_info, int cores_count, 
		}

	}



	/* Switch unused cores to interrupt mode and switch cores to polled mode

	 * if they will be used after rebalancing */

	SPDK_ENV_FOREACH_CORE(i) {

		reactor = spdk_reactor_get(i);

		core = &cores_info[i];

		/* We can switch mode only if reactor already does not have any threads */

		if (core->pending_threads_count == 0 && TAILQ_EMPTY(&reactor->threads)) {

			core->interrupt_mode = true;

		} else if (core->pending_threads_count != 0) {

			core->interrupt_mode = false;

		}

	}



	if (!g_core_mngmnt_available) {

		return;

	}