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Diffstat (limited to 'src/VBox/Runtime/r3/darwin/sched-darwin.cpp')
| -rw-r--r-- | src/VBox/Runtime/r3/darwin/sched-darwin.cpp | 353 |
1 files changed, 353 insertions, 0 deletions
diff --git a/src/VBox/Runtime/r3/darwin/sched-darwin.cpp b/src/VBox/Runtime/r3/darwin/sched-darwin.cpp new file mode 100644 index 00000000..cefd1b28 --- /dev/null +++ b/src/VBox/Runtime/r3/darwin/sched-darwin.cpp @@ -0,0 +1,353 @@ +/* $Id: sched-darwin.cpp $ */ +/** @file + * IPRT - Scheduling, Darwin. + */ + +/* + * Copyright (C) 2006-2020 Oracle Corporation + * + * This file is part of VirtualBox Open Source Edition (OSE), as + * available from http://www.virtualbox.org. This file is free software; + * you can redistribute it and/or modify it under the terms of the GNU + * General Public License (GPL) as published by the Free Software + * Foundation, in version 2 as it comes in the "COPYING" file of the + * VirtualBox OSE distribution. VirtualBox OSE is distributed in the + * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind. + * + * The contents of this file may alternatively be used under the terms + * of the Common Development and Distribution License Version 1.0 + * (CDDL) only, as it comes in the "COPYING.CDDL" file of the + * VirtualBox OSE distribution, in which case the provisions of the + * CDDL are applicable instead of those of the GPL. + * + * You may elect to license modified versions of this file under the + * terms and conditions of either the GPL or the CDDL or both. + */ + + +/********************************************************************************************************************************* +* Header Files * +*********************************************************************************************************************************/ +#define LOG_GROUP RTLOGGROUP_THREAD +#include <mach/thread_act.h> +#include <mach/thread_policy.h> +#include <mach/thread_info.h> +#include <mach/host_info.h> +#include <mach/mach_init.h> +#include <mach/mach_host.h> +#include <sched.h> +#include <pthread.h> +#include <limits.h> +#include <errno.h> + +#include <iprt/thread.h> +#include <iprt/log.h> +#include <iprt/assert.h> +#include <iprt/errcore.h> +#include <iprt/asm.h> +#include <iprt/assert.h> +#include "internal/sched.h" +#include "internal/thread.h" + + +/********************************************************************************************************************************* +* Structures and Typedefs * +*********************************************************************************************************************************/ +/** + * Configuration of one priority. + */ +typedef struct +{ + /** The priority. */ + RTPROCPRIORITY enmPriority; + /** The name of this priority. */ + const char *pszName; + /** Array scheduler attributes corresponding to each of the thread types. */ + struct + { + /** For sanity include the array index. */ + RTTHREADTYPE enmType; + /** The desired mach base_priority value. */ + int iBasePriority; + /** The suggested priority value. (Same as iBasePriority seems to do the + * trick.) */ + int iPriority; + } aTypes[RTTHREADTYPE_END]; +} PROCPRIORITY; + + +/********************************************************************************************************************************* +* Global Variables * +*********************************************************************************************************************************/ +/** + * Array of static priority configurations. + * + * ASSUMES that pthread_setschedparam takes a sched_priority argument in the + * range 0..127, which is translated into mach base_priority 0..63 and mach + * importance -31..32 (among other things). We also ASSUMES SCHED_OTHER. + * + * The base_priority range can be checked with tstDarwinSched, we're assuming it's + * 0..63 for user processes. + * + * Further we observe that fseventsd and mds both run at (mach) priority 50, + * while Finder runs at 47. At priority 63 we find the dynamic pager, the login + * window, UserEventAgent, SystemUIServer and coreaudiod. We do not wish to upset the + * dynamic pager, UI or audio, but we wish for I/O to not be bothered by spotlight + * (mds/fseventsd). + */ +static const PROCPRIORITY g_aPriorities[] = +{ + { + RTPROCPRIORITY_DEFAULT, "Default", + { + { RTTHREADTYPE_INVALID, INT_MIN, INT_MIN }, + { RTTHREADTYPE_INFREQUENT_POLLER, 29, 29 }, + { RTTHREADTYPE_MAIN_HEAVY_WORKER, 30, 30 }, + { RTTHREADTYPE_EMULATION, 31, 31 }, /* the default priority */ + { RTTHREADTYPE_DEFAULT, 32, 32 }, + { RTTHREADTYPE_GUI, 32, 32 }, + { RTTHREADTYPE_MAIN_WORKER, 32, 32 }, + { RTTHREADTYPE_VRDP_IO, 39, 39 }, + { RTTHREADTYPE_DEBUGGER, 42, 42 }, + { RTTHREADTYPE_MSG_PUMP, 47, 47 }, + { RTTHREADTYPE_IO, 52, 52 }, + { RTTHREADTYPE_TIMER, 55, 55 } + } + }, + { + RTPROCPRIORITY_LOW, "Low", + { + { RTTHREADTYPE_INVALID, INT_MIN, INT_MIN }, + { RTTHREADTYPE_INFREQUENT_POLLER, 20, 20 }, + { RTTHREADTYPE_MAIN_HEAVY_WORKER, 22, 22 }, + { RTTHREADTYPE_EMULATION, 24, 24 }, + { RTTHREADTYPE_DEFAULT, 28, 28 }, + { RTTHREADTYPE_GUI, 29, 29 }, + { RTTHREADTYPE_MAIN_WORKER, 30, 30 }, + { RTTHREADTYPE_VRDP_IO, 31, 31 }, + { RTTHREADTYPE_DEBUGGER, 31, 31 }, + { RTTHREADTYPE_MSG_PUMP, 31, 31 }, + { RTTHREADTYPE_IO, 31, 31 }, + { RTTHREADTYPE_TIMER, 31, 31 } + } + }, + { + RTPROCPRIORITY_NORMAL, "Normal", + { + { RTTHREADTYPE_INVALID, INT_MIN, INT_MIN }, + { RTTHREADTYPE_INFREQUENT_POLLER, 29, 29 }, + { RTTHREADTYPE_MAIN_HEAVY_WORKER, 30, 30 }, + { RTTHREADTYPE_EMULATION, 31, 31 }, /* the default priority */ + { RTTHREADTYPE_DEFAULT, 32, 32 }, + { RTTHREADTYPE_GUI, 32, 32 }, + { RTTHREADTYPE_MAIN_WORKER, 32, 32 }, + { RTTHREADTYPE_VRDP_IO, 39, 39 }, + { RTTHREADTYPE_DEBUGGER, 42, 42 }, + { RTTHREADTYPE_MSG_PUMP, 47, 47 }, + { RTTHREADTYPE_IO, 52, 52 }, + { RTTHREADTYPE_TIMER, 55, 55 } + } + }, + { + RTPROCPRIORITY_HIGH, "High", + { + { RTTHREADTYPE_INVALID, INT_MIN, INT_MIN }, + { RTTHREADTYPE_INFREQUENT_POLLER, 30, 30 }, + { RTTHREADTYPE_MAIN_HEAVY_WORKER, 31, 31 }, + { RTTHREADTYPE_EMULATION, 32, 32 }, + { RTTHREADTYPE_DEFAULT, 40, 40 }, + { RTTHREADTYPE_GUI, 41, 41 }, + { RTTHREADTYPE_MAIN_WORKER, 43, 43 }, + { RTTHREADTYPE_VRDP_IO, 45, 45 }, + { RTTHREADTYPE_DEBUGGER, 47, 47 }, + { RTTHREADTYPE_MSG_PUMP, 49, 49 }, + { RTTHREADTYPE_IO, 57, 57 }, + { RTTHREADTYPE_TIMER, 61, 61 } + } + }, + /* last */ + { + RTPROCPRIORITY_FLAT, "Flat", + { + { RTTHREADTYPE_INVALID, INT_MIN, INT_MIN }, + { RTTHREADTYPE_INFREQUENT_POLLER, 31, 31 }, + { RTTHREADTYPE_MAIN_HEAVY_WORKER, 31, 31 }, + { RTTHREADTYPE_EMULATION, 31, 31 }, + { RTTHREADTYPE_DEFAULT, 31, 31 }, + { RTTHREADTYPE_GUI, 31, 31 }, + { RTTHREADTYPE_MAIN_WORKER, 31, 31 }, + { RTTHREADTYPE_VRDP_IO, 31, 31 }, + { RTTHREADTYPE_DEBUGGER, 31, 31 }, + { RTTHREADTYPE_MSG_PUMP, 31, 31 }, + { RTTHREADTYPE_IO, 31, 31 }, + { RTTHREADTYPE_TIMER, 31, 31 } + } + }, +}; + + +/** + * The dynamic default priority configuration. + * + * This can be recalulated at runtime depending on what the + * system allow us to do. Presently we don't do this as it seems + * Darwin generally lets us do whatever we want. + * + * @remarks this is the same as "Normal" above. + */ +static PROCPRIORITY g_aDefaultPriority = +{ + RTPROCPRIORITY_DEFAULT, "Default", + { + { RTTHREADTYPE_INVALID, INT_MIN, INT_MIN }, + { RTTHREADTYPE_INFREQUENT_POLLER, 29, 29 }, + { RTTHREADTYPE_MAIN_HEAVY_WORKER, 30, 30 }, + { RTTHREADTYPE_EMULATION, 31, 31 }, /* the default priority */ + { RTTHREADTYPE_DEFAULT, 32, 32 }, + { RTTHREADTYPE_GUI, 32, 32 }, + { RTTHREADTYPE_MAIN_WORKER, 32, 32 }, + { RTTHREADTYPE_VRDP_IO, 39, 39 }, + { RTTHREADTYPE_DEBUGGER, 42, 42 }, + { RTTHREADTYPE_MSG_PUMP, 47, 47 }, + { RTTHREADTYPE_IO, 52, 52 }, + { RTTHREADTYPE_TIMER, 55, 55 } + } +}; + + +/** Pointer to the current priority configuration. */ +static const PROCPRIORITY *g_pProcessPriority = &g_aDefaultPriority; + + +/** + * Get's the priority information for the current thread. + * + * @returns The base priority + * @param pThread The thread to get it for. NULL for current. + */ +static int rtSchedDarwinGetBasePriority(PRTTHREADINT pThread) +{ + /* the base_priority. */ + mach_msg_type_number_t Count = POLICY_TIMESHARE_INFO_COUNT; + struct policy_timeshare_info TSInfo = {0,0,0,0,0}; + kern_return_t krc = thread_info(!pThread ? mach_thread_self() : pthread_mach_thread_np((pthread_t)pThread->Core.Key), + THREAD_SCHED_TIMESHARE_INFO, (thread_info_t)&TSInfo, &Count); + Assert(krc == KERN_SUCCESS); NOREF(krc); + + return TSInfo.base_priority; +} + + +DECLHIDDEN(int) rtSchedNativeCalcDefaultPriority(RTTHREADTYPE enmType) +{ + Assert(enmType > RTTHREADTYPE_INVALID && enmType < RTTHREADTYPE_END); + + /* + * Get the current priority. + */ + int iBasePriority = rtSchedDarwinGetBasePriority(NULL); + Assert(iBasePriority >= 0 && iBasePriority <= 63); + + /* + * If it doesn't match the default, select the closest one from the table. + */ + int offBest = RT_ABS(g_pProcessPriority->aTypes[enmType].iBasePriority - iBasePriority); + if (offBest) + { + for (unsigned i = 0; i < RT_ELEMENTS(g_aPriorities); i++) + { + int off = RT_ABS(g_aPriorities[i].aTypes[enmType].iBasePriority - iBasePriority); + if (off < offBest) + { + g_pProcessPriority = &g_aPriorities[i]; + if (!off) + break; + offBest = off; + } + } + } + + return VINF_SUCCESS; +} + + +DECLHIDDEN(int) rtProcNativeSetPriority(RTPROCPRIORITY enmPriority) +{ + Assert(enmPriority > RTPROCPRIORITY_INVALID && enmPriority < RTPROCPRIORITY_LAST); + + /* + * No checks necessary, we assume we can set any priority in the user process range. + */ + const PROCPRIORITY *pProcessPriority = &g_aDefaultPriority; + for (unsigned i = 0; i < RT_ELEMENTS(g_aPriorities); i++) + if (g_aPriorities[i].enmPriority == enmPriority) + { + pProcessPriority = &g_aPriorities[i]; + break; + } + Assert(pProcessPriority != &g_aDefaultPriority); + ASMAtomicUoWritePtr(&g_pProcessPriority, pProcessPriority); + + return VINF_SUCCESS; +} + + +DECLHIDDEN(int) rtThreadNativeSetPriority(PRTTHREADINT pThread, RTTHREADTYPE enmType) +{ + Assert(enmType > RTTHREADTYPE_INVALID && enmType < RTTHREADTYPE_END); + AssertMsg(g_pProcessPriority && g_pProcessPriority->aTypes[enmType].enmType == enmType, + ("enmType=%d entry=%d\n", enmType, g_pProcessPriority->aTypes[enmType].enmType)); + + /* + * Get the current policy and params first since there are + * opaque members in the param structure and we don't wish to + * change the policy. + */ + int iSchedPolicy = SCHED_OTHER; + struct sched_param SchedParam = {0, {0,0,0,0} }; + int err = pthread_getschedparam((pthread_t)pThread->Core.Key, &iSchedPolicy, &SchedParam); + if (!err) + { + int const iDesiredBasePriority = g_pProcessPriority->aTypes[enmType].iBasePriority; + int iPriority = g_pProcessPriority->aTypes[enmType].iPriority; + + /* + * First try with the given pthread priority number. + * Then make adjustments in case we missed the desired base priority (interface + * changed or whatever - its using an obsolete mach api). + */ + SchedParam.sched_priority = iPriority; + err = pthread_setschedparam((pthread_t)pThread->Core.Key, iSchedPolicy, &SchedParam); + if (!err) + { + int i = 0; + int iBasePriority = rtSchedDarwinGetBasePriority(pThread); + + while ( !err + && iBasePriority < iDesiredBasePriority + && i++ < 256) + { + SchedParam.sched_priority = ++iPriority; + err = pthread_setschedparam((pthread_t)pThread->Core.Key, iSchedPolicy, &SchedParam); + iBasePriority = rtSchedDarwinGetBasePriority(pThread); + } + + while ( !err + && iPriority > 0 + && iBasePriority > iDesiredBasePriority + && i++ < 256) + { + SchedParam.sched_priority = --iPriority; + err = pthread_setschedparam((pthread_t)pThread->Core.Key, iSchedPolicy, &SchedParam); + iBasePriority = rtSchedDarwinGetBasePriority(pThread); + } + + return VINF_SUCCESS; + } + } + int rc = RTErrConvertFromErrno(err); + AssertMsgRC(rc, ("rc=%Rrc err=%d iSchedPolicy=%d sched_priority=%d\n", + rc, err, iSchedPolicy, SchedParam.sched_priority)); + return rc; +} + |