!518 fix: tick 动态化计算优化，消除中断执行时间对系统总体时间的影响，保证软件定时器的响应精度。

Merge pull request !518 from zhushengle/sched_tick

kernel/base/BUILD.gn

@@ -34,7 +34,6 @@ kernel_module(module_name) {
   sources = [
     "core/los_bitmap.c",
     "core/los_process.c",
-    "core/los_sortlink.c",
     "core/los_swtmr.c",
     "core/los_sys.c",
     "core/los_task.c",
@@ -68,6 +67,7 @@ kernel_module(module_name) {
     "mp/los_stat.c",
     "om/los_err.c",
     "sched/sched_sq/los_sched.c",
+    "sched/sched_sq/los_sortlink.c",
     "vm/los_vm_boot.c",
     "vm/los_vm_dump.c",
     "vm/los_vm_fault.c",
@@ -83,9 +83,7 @@ kernel_module(module_name) {
   ]
 
   if (defined(LOSCFG_SHELL_CMD_DEBUG)) {
-    configs += [
-      "$HDFTOPDIR:hdf_config"
-    ]
+    configs += [ "$HDFTOPDIR:hdf_config" ]
   }
 
   public_configs = [ ":public" ]

kernel/base/core/los_swtmr.c

@@ -178,10 +178,9 @@ ERROR:
  * Description: Start Software Timer
  * Input      : swtmr --- Need to start software timer
  */
-LITE_OS_SEC_TEXT VOID OsSwtmrStart(SWTMR_CTRL_S *swtmr)
+LITE_OS_SEC_TEXT VOID OsSwtmrStart(UINT64 currTime, SWTMR_CTRL_S *swtmr)
 {
     UINT32 ticks;
-    UINT64 currTime = OsGetCurrSchedTimeCycle();
 
     if ((swtmr->uwOverrun == 0) && ((swtmr->ucMode == LOS_SWTMR_MODE_ONCE) ||
         (swtmr->ucMode == LOS_SWTMR_MODE_OPP) ||
@@ -192,10 +191,8 @@ LITE_OS_SEC_TEXT VOID OsSwtmrStart(SWTMR_CTRL_S *swtmr)
     }
     swtmr->ucState = OS_SWTMR_STATUS_TICKING;
 
-    OsAdd2SortLink(&swtmr->stSortList, currTime, ticks, OS_SORT_LINK_SWTMR);
-    if (OS_SCHEDULER_ACTIVE) {
-        OsSchedUpdateExpireTime(currTime);
-    }
+    OsAdd2SortLink(&swtmr->stSortList, swtmr->startTime, ticks, OS_SORT_LINK_SWTMR);
+    OsSchedUpdateExpireTime(currTime);
     return;
 }
 
@@ -211,7 +208,7 @@ STATIC INLINE VOID OsSwtmrDelete(SWTMR_CTRL_S *swtmr)
     swtmr->uwOwnerPid = 0;
 }
 
-STATIC INLINE VOID OsWakePendTimeSwtmr(Percpu *cpu, SWTMR_CTRL_S *swtmr)
+STATIC INLINE VOID OsWakePendTimeSwtmr(Percpu *cpu, UINT64 currTime, SWTMR_CTRL_S *swtmr)
 {
     LOS_SpinLock(&g_swtmrSpin);
     SwtmrHandlerItemPtr swtmrHandler = (SwtmrHandlerItemPtr)LOS_MemboxAlloc(g_swtmrHandlerPool);
@@ -236,7 +233,7 @@ STATIC INLINE VOID OsWakePendTimeSwtmr(Percpu *cpu, SWTMR_CTRL_S *swtmr)
         swtmr->ucState = OS_SWTMR_STATUS_CREATED;
     } else {
         swtmr->uwOverrun++;
-        OsSwtmrStart(swtmr);
+        OsSwtmrStart(currTime, swtmr);
     }
 
     LOS_SpinUnlock(&g_swtmrSpin);
@@ -267,12 +264,12 @@ LITE_OS_SEC_TEXT VOID OsSwtmrScan(VOID)
     UINT64 currTime = OsGetCurrSchedTimeCycle();
     while (sortList->responseTime <= currTime) {
         sortList = LOS_DL_LIST_ENTRY(listObject->pstNext, SortLinkList, sortLinkNode);
-        OsDeleteNodeSortLink(swtmrSortLink, sortList);
-
         SWTMR_CTRL_S *swtmr = LOS_DL_LIST_ENTRY(sortList, SWTMR_CTRL_S, stSortList);
+        swtmr->startTime = GET_SORTLIST_VALUE(sortList);
+        OsDeleteNodeSortLink(swtmrSortLink, sortList);
         LOS_SpinUnlock(&cpu->swtmrSortLinkSpin);
 
-        OsWakePendTimeSwtmr(cpu, swtmr);
+        OsWakePendTimeSwtmr(cpu, currTime, swtmr);
 
         LOS_SpinLock(&cpu->swtmrSortLinkSpin);
         if (LOS_ListEmpty(listObject)) {
@@ -305,9 +302,7 @@ LITE_OS_SEC_TEXT STATIC VOID OsSwtmrStop(SWTMR_CTRL_S *swtmr)
     swtmr->ucState = OS_SWTMR_STATUS_CREATED;
     swtmr->uwOverrun = 0;
 
-    if (OS_SCHEDULER_ACTIVE) {
-        OsSchedUpdateExpireTime(OsGetCurrSchedTimeCycle());
-    }
+    OsSchedUpdateExpireTime(OsGetCurrSchedTimeCycle());
 }
 
 /*
@@ -403,7 +398,8 @@ LITE_OS_SEC_TEXT UINT32 LOS_SwtmrStart(UINT16 swtmrID)
             OsSwtmrStop(swtmr);
             /* fall-through */
         case OS_SWTMR_STATUS_CREATED:
-            OsSwtmrStart(swtmr);
+            swtmr->startTime = OsGetCurrSchedTimeCycle();
+            OsSwtmrStart(swtmr->startTime, swtmr);
             break;
         default:
             ret = LOS_ERRNO_SWTMR_STATUS_INVALID;

kernel/base/include/los_percpu_pri.h

@@ -57,6 +57,7 @@ typedef struct {
     SortLinkAttribute swtmrSortLink;         /* swtmr sort link */
     SPIN_LOCK_S       swtmrSortLinkSpin;     /* swtmr sort link spin lock */
     UINT64            responseTime;          /* Response time for current nuclear Tick interrupts */
+    UINT64            tickStartTime;         /* The time when the tick interrupt starts processing */
     UINT32            responseID;            /* The response ID of the current nuclear TICK interrupt */
     UINTPTR           runProcess;            /* The address of the process control block pointer to which
                                                 the current kernel is running */

kernel/base/include/los_sched_pri.h

@@ -45,6 +45,10 @@ extern "C" {
 #endif /* __cplusplus */
 #endif /* __cplusplus */
 
+#define OS_SCHED_MINI_PERIOD       (OS_SYS_CLOCK / LOSCFG_BASE_CORE_TICK_PER_SECOND_MINI)
+#define OS_TICK_RESPONSE_PRECISION (UINT32)((OS_SCHED_MINI_PERIOD * 75) / 100)
+#define OS_SCHED_MAX_RESPONSE_TIME (UINT64)(((UINT64)-1) - 1U)
+
 extern UINT32 g_taskScheduled;
 typedef BOOL (*SchedScan)(VOID);
 
@@ -86,8 +90,9 @@ STATIC INLINE VOID OsSchedIrqStartTime(VOID)
 #define OS_SCHEDULER_ACTIVE (g_taskScheduled & (1U << ArchCurrCpuid()))
 
 typedef enum {
-    INT_NO_RESCH = 0,   /* no needs to schedule */
-    INT_PEND_RESCH,     /* pending schedule flag */
+    INT_NO_RESCH = 0x0,   /* no needs to schedule */
+    INT_PEND_RESCH = 0x1, /* pending schedule flag */
+    INT_PEND_TICK = 0x2,  /* pending tick */
 } SchedFlag;
 
 /* Check if preemptable with counter flag */
@@ -102,7 +107,7 @@ STATIC INLINE BOOL OsPreemptable(VOID)
     BOOL preemptable = (OsPercpuGet()->taskLockCnt == 0);
     if (!preemptable) {
         /* Set schedule flag if preemption is disabled */
-        OsPercpuGet()->schedFlag = INT_PEND_RESCH;
+        OsPercpuGet()->schedFlag |= INT_PEND_RESCH;
     }
     LOS_IntRestore(intSave);
     return preemptable;
@@ -124,7 +129,7 @@ STATIC INLINE BOOL OsPreemptableInSched(VOID)
 #endif
     if (!preemptable) {
         /* Set schedule flag if preemption is disabled */
-        OsPercpuGet()->schedFlag = INT_PEND_RESCH;
+        OsPercpuGet()->schedFlag |= INT_PEND_RESCH;
     }
 
     return preemptable;
@@ -139,8 +144,8 @@ STATIC INLINE VOID OsCpuSchedUnlock(Percpu *cpu, UINT32 intSave)
 {
     if (cpu->taskLockCnt > 0) {
         cpu->taskLockCnt--;
-        if ((cpu->taskLockCnt == 0) && (cpu->schedFlag == INT_PEND_RESCH) && OS_SCHEDULER_ACTIVE) {
-            cpu->schedFlag = INT_NO_RESCH;
+        if ((cpu->taskLockCnt == 0) && (cpu->schedFlag & INT_PEND_RESCH) && OS_SCHEDULER_ACTIVE) {
+            cpu->schedFlag &= ~INT_PEND_RESCH;
             LOS_IntRestore(intSave);
             LOS_Schedule();
             return;

kernel/base/include/los_sortlink_pri.h

@@ -62,6 +62,7 @@ typedef struct {
 
 #define OS_SORT_LINK_INVALID_TIME ((UINT64)-1)
 #define SET_SORTLIST_VALUE(sortList, value) (((SortLinkList *)(sortList))->responseTime = (value))
+#define GET_SORTLIST_VALUE(sortList) (((SortLinkList *)(sortList))->responseTime)
 
 extern UINT64 OsGetNextExpireTime(UINT64 startTime);
 extern UINT32 OsSortLinkInit(SortLinkAttribute *sortLinkHeader);

kernel/base/misc/swtmr_shellcmd.c

@@ -54,6 +54,9 @@ LITE_OS_SEC_DATA_MINOR STATIC CHAR g_shellSwtmrStatus[][SWTMR_STRLEN] = {
 
 STATIC VOID OsPrintSwtmrMsg(const SWTMR_CTRL_S *swtmr)
 {
+    UINT32 ticks = 0;
+    (VOID)LOS_SwtmrTimeGet(swtmr->usTimerID, &ticks);
+
     PRINTK("0x%08x  "
            "%-7s  "
            "%-6s   "
@@ -65,7 +68,7 @@ STATIC VOID OsPrintSwtmrMsg(const SWTMR_CTRL_S *swtmr)
            g_shellSwtmrStatus[swtmr->ucState],
            g_shellSwtmrMode[swtmr->ucMode],
            swtmr->uwInterval,
-           swtmr->uwCount,
+           ticks,
            swtmr->uwArg,
            swtmr->pfnHandler);
 }

kernel/base/mp/los_mp.c

@@ -56,7 +56,7 @@ VOID OsMpScheduleHandler(VOID)
      * set schedule flag to differ from wake function,
      * so that the scheduler can be triggered at the end of irq.
      */
-    OsPercpuGet()->schedFlag = INT_PEND_RESCH;
+    OsPercpuGet()->schedFlag |= INT_PEND_RESCH;
 }
 
 VOID OsMpHaltHandler(VOID)

kernel/base/sched/sched_sq/los_sched.c

@@ -47,8 +47,6 @@
 #include "los_stat_pri.h"
 #endif
 
-
-
 #define OS_32BIT_MAX               0xFFFFFFFFUL
 #define OS_64BIT_MAX               0xFFFFFFFFFFFFFFFFULL
 #define OS_SCHED_FIFO_TIMEOUT      0x7FFFFFFF
@@ -59,7 +57,6 @@
 #define OS_SCHED_TIME_SLICES_DIFF  (OS_SCHED_TIME_SLICES_MAX - OS_SCHED_TIME_SLICES_MIN)
 #define OS_SCHED_READY_MAX         30
 #define OS_TIME_SLICE_MIN          (INT32)((50 * OS_SYS_NS_PER_US) / OS_NS_PER_CYCLE) /* 50us */
-#define OS_SCHED_MAX_RESPONSE_TIME (UINT64)(OS_64BIT_MAX - 1U)
 
 typedef struct {
     LOS_DL_LIST priQueueList[OS_PRIORITY_QUEUE_NUM];
@@ -120,6 +117,7 @@ UINT32 OsShellShowTickRespo(VOID)
 {
     UINT32 intSave;
     UINT16 cpu;
+    UINT64 allTime;
 
     UINT32 tickSize = sizeof(SchedTickDebug) * LOSCFG_KERNEL_CORE_NUM;
     SchedTickDebug *schedDebug = (SchedTickDebug *)LOS_MemAlloc(m_aucSysMem1, tickSize);
@@ -141,15 +139,18 @@ UINT32 OsShellShowTickRespo(VOID)
         PRINTK("cpu : %u sched data num : %u set time count : %u SortMax : %u\n",
                cpu, schedData->index, schedData->setTickCount, sortLinkNum[cpu]);
         UINT32 *data = schedData->tickResporeTime;
-        for (UINT32 i = 0; i < schedData->index; i++) {
+        allTime = 0;
+        for (UINT32 i = 1; i < schedData->index; i++) {
+            allTime += data[i];
             UINT32 timeUs = (data[i] * OS_NS_PER_CYCLE) / OS_SYS_NS_PER_US;
             PRINTK("     %u(%u)", timeUs, timeUs / OS_US_PER_TICK);
-            if ((i != 0) && ((i % 5) == 0)) {
+            if ((i != 0) && ((i % 5) == 0)) { /* A row of 5 data */
                 PRINTK("\n");
             }
         }
 
-        PRINTK("\n");
+        allTime = (allTime * OS_NS_PER_CYCLE) / OS_SYS_NS_PER_US;
+        PRINTK("\nTick Indicates the average response period: %llu(us)\n", allTime / (schedData->index - 1));
     }
 
     (VOID)LOS_MemFree(m_aucSysMem1, schedDebug);
@@ -279,6 +280,47 @@ STATIC INLINE VOID OsTimeSliceUpdate(LosTaskCB *taskCB, UINT64 currTime)
 #endif
 }
 
+STATIC INLINE VOID OsSchedTickReload(Percpu *currCpu, UINT64 nextResponseTime, UINT32 responseID, BOOL isTimeSlice)
+{
+    UINT64 currTime, nextExpireTime;
+    UINT32 usedTime;
+
+    currTime = OsGetCurrSchedTimeCycle();
+    if (currCpu->tickStartTime != 0) {
+        usedTime = currTime - currCpu->tickStartTime;
+        currCpu->tickStartTime = 0;
+    } else {
+        usedTime = 0;
+    }
+
+    if ((nextResponseTime > usedTime) && ((nextResponseTime - usedTime) > OS_TICK_RESPONSE_PRECISION)) {
+        nextResponseTime -= usedTime;
+    } else {
+        nextResponseTime = OS_TICK_RESPONSE_PRECISION;
+    }
+
+    nextExpireTime = currTime + nextResponseTime;
+    if (nextExpireTime >= currCpu->responseTime) {
+        return;
+    }
+
+    if (isTimeSlice) {
+        /* The expiration time of the current system is the thread's slice expiration time */
+        currCpu->responseID = responseID;
+    } else {
+        currCpu->responseID = OS_INVALID_VALUE;
+    }
+    currCpu->responseTime = nextExpireTime;
+    HalClockTickTimerReload(nextResponseTime);
+
+#ifdef LOSCFG_SCHED_TICK_DEBUG
+    SchedTickDebug *schedDebug = &g_schedTickDebug[ArchCurrCpuid()];
+    if (schedDebug->index < OS_SCHED_DEBUG_DATA_NUM) {
+        schedDebug->setTickCount++;
+    }
+#endif
+}
+
 STATIC INLINE VOID OsSchedSetNextExpireTime(UINT64 startTime, UINT32 responseID,
                                             UINT64 taskEndTime, UINT32 oldResponseID)
 {
@@ -287,6 +329,7 @@ STATIC INLINE VOID OsSchedSetNextExpireTime(UINT64 startTime, UINT32 responseID,
     UINT64 nextResponseTime;
     BOOL isTimeSlice = FALSE;
 
+    currCpu->schedFlag &= ~INT_PEND_TICK;
     if (currCpu->responseID == oldResponseID) {
         /* This time has expired, and the next time the theory has expired is infinite */
         currCpu->responseTime = OS_SCHED_MAX_RESPONSE_TIME;
@@ -295,58 +338,44 @@ STATIC INLINE VOID OsSchedSetNextExpireTime(UINT64 startTime, UINT32 responseID,
     /* The current thread's time slice has been consumed, but the current system lock task cannot
      * trigger the schedule to release the CPU
      */
-    if (taskEndTime < nextExpireTime) {
+    if ((nextExpireTime > taskEndTime) && ((nextExpireTime - taskEndTime) > OS_SCHED_MINI_PERIOD)) {
         nextExpireTime = taskEndTime;
         isTimeSlice = TRUE;
     }
 
-    if ((currCpu->responseTime > nextExpireTime) && ((currCpu->responseTime - nextExpireTime) >= OS_CYCLE_PER_TICK)) {
+    if ((currCpu->responseTime > nextExpireTime) &&
+        ((currCpu->responseTime - nextExpireTime) >= OS_TICK_RESPONSE_PRECISION)) {
         nextResponseTime = nextExpireTime - startTime;
-        if (nextResponseTime < OS_CYCLE_PER_TICK) {
-            nextResponseTime = OS_CYCLE_PER_TICK;
-            nextExpireTime = startTime + nextResponseTime;
-            if (nextExpireTime >= currCpu->responseTime) {
-                return;
-            }
-        } else if (nextResponseTime > g_schedTickMaxResponseTime) {
+        if (nextResponseTime > g_schedTickMaxResponseTime) {
             nextResponseTime = g_schedTickMaxResponseTime;
-            nextExpireTime = startTime + nextResponseTime;
         }
     } else {
         /* There is no point earlier than the current expiration date */
+        currCpu->tickStartTime = 0;
         return;
     }
 
-    if (isTimeSlice) {
-        /* The expiration time of the current system is the thread's slice expiration time */
-        currCpu->responseID = responseID;
-    } else {
-        currCpu->responseID = OS_INVALID_VALUE;
-    }
-
-    currCpu->responseTime = nextExpireTime;
-    HalClockTickTimerReload(nextResponseTime);
-
-#ifdef LOSCFG_SCHED_TICK_DEBUG
-    SchedTickDebug *schedDebug = &g_schedTickDebug[ArchCurrCpuid()];
-    if (schedDebug->index < OS_SCHED_DEBUG_DATA_NUM) {
-        schedDebug->setTickCount++;
-    }
-#endif
+    OsSchedTickReload(currCpu, nextResponseTime, responseID, isTimeSlice);
 }
 
 VOID OsSchedUpdateExpireTime(UINT64 startTime)
 {
     UINT64 endTime;
+    Percpu *cpu = OsPercpuGet();
     LosTaskCB *runTask = OsCurrTaskGet();
 
+    if (!OS_SCHEDULER_ACTIVE || OS_INT_ACTIVE) {
+        cpu->schedFlag |= INT_PEND_TICK;
+        return;
+    }
+
     if (runTask->policy == LOS_SCHED_RR) {
         LOS_SpinLock(&g_taskSpin);
         INT32 timeSlice = (runTask->timeSlice <= OS_TIME_SLICE_MIN) ? runTask->initTimeSlice : runTask->timeSlice;
         LOS_SpinUnlock(&g_taskSpin);
         endTime = startTime + timeSlice;
     } else {
-        endTime = OS_SCHED_MAX_RESPONSE_TIME;
+        endTime = OS_SCHED_MAX_RESPONSE_TIME - OS_TICK_RESPONSE_PRECISION;
     }
 
     OsSchedSetNextExpireTime(startTime, runTask->taskID, endTime, runTask->taskID);
@@ -737,20 +766,23 @@ VOID OsSchedTick(VOID)
     Sched *sched = g_sched;
     Percpu *currCpu = OsPercpuGet();
     BOOL needSched = FALSE;
+    LosTaskCB *runTask = OsCurrTaskGet();
 
+    currCpu->tickStartTime = runTask->irqStartTime;
     if (currCpu->responseID == OS_INVALID_VALUE) {
         if (sched->swtmrScan != NULL) {
             (VOID)sched->swtmrScan();
         }
 
         needSched = sched->taskScan();
-        currCpu->responseTime = OS_SCHED_MAX_RESPONSE_TIME;
 
         if (needSched) {
             LOS_MpSchedule(OS_MP_CPU_ALL);
-            currCpu->schedFlag = INT_PEND_RESCH;
+            currCpu->schedFlag |= INT_PEND_RESCH;
         }
     }
+    currCpu->schedFlag |= INT_PEND_TICK;
+    currCpu->responseTime = OS_SCHED_MAX_RESPONSE_TIME;
 }
 
 VOID OsSchedSetIdleTaskSchedParam(LosTaskCB *idleTask)
@@ -996,7 +1028,7 @@ STATIC VOID OsSchedTaskSwicth(LosTaskCB *runTask, LosTaskCB *newTask)
     if (newTask->policy == LOS_SCHED_RR) {
         endTime = newTask->startTime + newTask->timeSlice;
     } else {
-        endTime = OS_SCHED_MAX_RESPONSE_TIME;
+        endTime = OS_SCHED_MAX_RESPONSE_TIME - OS_TICK_RESPONSE_PRECISION;
     }
     OsSchedSetNextExpireTime(newTask->startTime, newTask->taskID, endTime, runTask->taskID);
 
@@ -1017,11 +1049,11 @@ VOID OsSchedIrqEndCheckNeedSched(VOID)
 
     OsTimeSliceUpdate(runTask, OsGetCurrSchedTimeCycle());
     if (runTask->timeSlice <= OS_TIME_SLICE_MIN) {
-        percpu->schedFlag = INT_PEND_RESCH;
+        percpu->schedFlag |= INT_PEND_RESCH;
     }
 
-    if (OsPreemptable() && (percpu->schedFlag == INT_PEND_RESCH)) {
-        percpu->schedFlag = INT_NO_RESCH;
+    if (OsPreemptable() && (percpu->schedFlag & INT_PEND_RESCH)) {
+        percpu->schedFlag &= ~INT_PEND_RESCH;
 
         LOS_SpinLock(&g_taskSpin);
 
@@ -1037,7 +1069,9 @@ VOID OsSchedIrqEndCheckNeedSched(VOID)
         LOS_SpinUnlock(&g_taskSpin);
     }
 
-    OsSchedUpdateExpireTime(runTask->startTime);
+    if (percpu->schedFlag & INT_PEND_TICK) {
+        OsSchedUpdateExpireTime(runTask->startTime);
+    }
 }
 
 VOID OsSchedResched(VOID)
@@ -1049,7 +1083,7 @@ VOID OsSchedResched(VOID)
     LOS_ASSERT(OsPercpuGet()->taskLockCnt == 0);
 #endif
 
-    OsPercpuGet()->schedFlag = INT_NO_RESCH;
+    OsPercpuGet()->schedFlag &= ~INT_PEND_RESCH;
     LosTaskCB *runTask = OsCurrTaskGet();
     LosTaskCB *newTask = OsGetTopTask();
     if (runTask == newTask) {
@@ -1065,7 +1099,7 @@ VOID LOS_Schedule(VOID)
     LosTaskCB *runTask = OsCurrTaskGet();
 
     if (OS_INT_ACTIVE) {
-        OsPercpuGet()->schedFlag = INT_PEND_RESCH;
+        OsPercpuGet()->schedFlag |= INT_PEND_RESCH;
         return;
     }
 

kernel/base/core/los_sortlink.c → kernel/base/sched/sched_sq/los_sortlink.c

@@ -36,7 +36,6 @@
 #include "los_sched_pri.h"
 #include "los_mp.h"
 
-
 UINT32 OsSortLinkInit(SortLinkAttribute *sortLinkHeader)
 {
     LOS_ListInit(&sortLinkHeader->sortLink);
@@ -87,39 +86,19 @@ VOID OsDeleteNodeSortLink(SortLinkAttribute *sortLinkHeader, SortLinkList *sortL
 
 STATIC INLINE UINT64 OsGetSortLinkNextExpireTime(SortLinkAttribute *sortHeader, UINT64 startTime)
 {
-    UINT64 expirTime = 0;
-    UINT64 nextExpirTime = 0;
     LOS_DL_LIST *head = &sortHeader->sortLink;
     LOS_DL_LIST *list = head->pstNext;
 
     if (LOS_ListEmpty(head)) {
-        return (UINT64)-1;
-    }
-
-    do {
-        SortLinkList *listSorted = LOS_DL_LIST_ENTRY(list, SortLinkList, sortLinkNode);
-        if (listSorted->responseTime <= startTime) {
-            expirTime = startTime;
-            list = list->pstNext;
-        } else {
-            nextExpirTime = listSorted->responseTime;
-            break;
-        }
-    } while (list != head);
-
-    if (expirTime == 0) {
-        return nextExpirTime;
-    }
-
-    if (nextExpirTime == 0) {
-        return expirTime;
+        return OS_SCHED_MAX_RESPONSE_TIME - OS_TICK_RESPONSE_PRECISION;
     }
 
-    if ((nextExpirTime - expirTime) <= OS_US_PER_TICK) {
-        return nextExpirTime;
+    SortLinkList *listSorted = LOS_DL_LIST_ENTRY(list, SortLinkList, sortLinkNode);
+    if (listSorted->responseTime <= (startTime + OS_TICK_RESPONSE_PRECISION)) {
+        return startTime + OS_TICK_RESPONSE_PRECISION;
     }
 
-    return expirTime;
+    return listSorted->responseTime;
 }
 
 STATIC Percpu *OsFindIdleCpu(UINT16 *idleCpuID)

kernel/include/los_swtmr.h

@@ -276,6 +276,7 @@ typedef struct tagSwTmrCtrl {
                              that handles software timer timeout is called */
     SWTMR_PROC_FUNC pfnHandler; /**< Callback function that handles software timer timeout */
     UINT32          uwOwnerPid; /** Owner of this software timer */
+    UINT64 startTime;  /**< Software timer start time */
 } SWTMR_CTRL_S;
 
 /**

platform/los_config.h

@@ -97,6 +97,22 @@ extern UINT32 __heap_end;
 #define LOSCFG_BASE_CORE_TICK_PER_SECOND  1000  /* 1ms per tick */
 #endif
 
+/**
+ * @ingroup los_config
+ * Minimum response error accuracy of tick interrupts, number of ticks in one second
+ */
+#ifndef LOSCFG_BASE_CORE_TICK_PER_SECOND_MINI
+#define LOSCFG_BASE_CORE_TICK_PER_SECOND_MINI  1000UL  /* 1ms */
+#endif
+
+#if (LOSCFG_BASE_CORE_TICK_PER_SECOND > LOSCFG_BASE_CORE_TICK_PER_SECOND_MINI)
+    #error "LOSCFG_BASE_CORE_TICK_PER_SECOND_MINI must be greater than LOSCFG_BASE_CORE_TICK_PER_SECOND"
+#endif
+
+#if (LOSCFG_BASE_CORE_TICK_PER_SECOND_MINI > 1000UL)
+    #error "LOSCFG_BASE_CORE_TICK_PER_SECOND_MINI must be less than or equal to 1000"
+#endif
+
 /**
  * @ingroup los_config
  * Microseconds of adjtime in one second