Annotation of qemu/balloon.c, revision 1.1.1.1

1.1       root        1: /*
                      2:  * QEMU System Emulator
                      3:  *
                      4:  * Copyright (c) 2003-2008 Fabrice Bellard
                      5:  *
                      6:  * Permission is hereby granted, free of charge, to any person obtaining a copy
                      7:  * of this software and associated documentation files (the "Software"), to deal
                      8:  * in the Software without restriction, including without limitation the rights
                      9:  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
                     10:  * copies of the Software, and to permit persons to whom the Software is
                     11:  * furnished to do so, subject to the following conditions:
                     12:  *
                     13:  * The above copyright notice and this permission notice shall be included in
                     14:  * all copies or substantial portions of the Software.
                     15:  *
                     16:  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
                     17:  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
                     18:  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
                     19:  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
                     20:  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
                     21:  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
                     22:  * THE SOFTWARE.
                     23:  */
                     24: 
                     25: #include "sysemu.h"
                     26: #include "monitor.h"
                     27: #include "qjson.h"
                     28: #include "qint.h"
                     29: #include "cpu-common.h"
                     30: #include "kvm.h"
                     31: #include "balloon.h"
                     32: 
                     33: 
                     34: static QEMUBalloonEvent *qemu_balloon_event;
                     35: void *qemu_balloon_event_opaque;
                     36: 
                     37: void qemu_add_balloon_handler(QEMUBalloonEvent *func, void *opaque)
                     38: {
                     39:     qemu_balloon_event = func;
                     40:     qemu_balloon_event_opaque = opaque;
                     41: }
                     42: 
                     43: int qemu_balloon(ram_addr_t target, MonitorCompletion cb, void *opaque)
                     44: {
                     45:     if (qemu_balloon_event) {
                     46:         qemu_balloon_event(qemu_balloon_event_opaque, target, cb, opaque);
                     47:         return 1;
                     48:     } else {
                     49:         return 0;
                     50:     }
                     51: }
                     52: 
                     53: int qemu_balloon_status(MonitorCompletion cb, void *opaque)
                     54: {
                     55:     if (qemu_balloon_event) {
                     56:         qemu_balloon_event(qemu_balloon_event_opaque, 0, cb, opaque);
                     57:         return 1;
                     58:     } else {
                     59:         return 0;
                     60:     }
                     61: }
                     62: 
                     63: static void print_balloon_stat(const char *key, QObject *obj, void *opaque)
                     64: {
                     65:     Monitor *mon = opaque;
                     66: 
                     67:     if (strcmp(key, "actual"))
                     68:         monitor_printf(mon, ",%s=%" PRId64, key,
                     69:                        qint_get_int(qobject_to_qint(obj)));
                     70: }
                     71: 
                     72: void monitor_print_balloon(Monitor *mon, const QObject *data)
                     73: {
                     74:     QDict *qdict;
                     75: 
                     76:     qdict = qobject_to_qdict(data);
                     77:     if (!qdict_haskey(qdict, "actual"))
                     78:         return;
                     79: 
                     80:     monitor_printf(mon, "balloon: actual=%" PRId64,
                     81:                    qdict_get_int(qdict, "actual") >> 20);
                     82:     qdict_iter(qdict, print_balloon_stat, mon);
                     83:     monitor_printf(mon, "\n");
                     84: }
                     85: 
                     86: /**
                     87:  * do_info_balloon(): Balloon information
                     88:  *
                     89:  * Make an asynchronous request for balloon info.  When the request completes
                     90:  * a QDict will be returned according to the following specification:
                     91:  *
                     92:  * - "actual": current balloon value in bytes
                     93:  * The following fields may or may not be present:
                     94:  * - "mem_swapped_in": Amount of memory swapped in (bytes)
                     95:  * - "mem_swapped_out": Amount of memory swapped out (bytes)
                     96:  * - "major_page_faults": Number of major faults
                     97:  * - "minor_page_faults": Number of minor faults
                     98:  * - "free_mem": Total amount of free and unused memory (bytes)
                     99:  * - "total_mem": Total amount of available memory (bytes)
                    100:  *
                    101:  * Example:
                    102:  *
                    103:  * { "actual": 1073741824, "mem_swapped_in": 0, "mem_swapped_out": 0,
                    104:  *   "major_page_faults": 142, "minor_page_faults": 239245,
                    105:  *   "free_mem": 1014185984, "total_mem": 1044668416 }
                    106:  */
                    107: int do_info_balloon(Monitor *mon, MonitorCompletion cb, void *opaque)
                    108: {
                    109:     int ret;
                    110: 
                    111:     if (kvm_enabled() && !kvm_has_sync_mmu()) {
                    112:         qerror_report(QERR_KVM_MISSING_CAP, "synchronous MMU", "balloon");
                    113:         return -1;
                    114:     }
                    115: 
                    116:     ret = qemu_balloon_status(cb, opaque);
                    117:     if (!ret) {
                    118:         qerror_report(QERR_DEVICE_NOT_ACTIVE, "balloon");
                    119:         return -1;
                    120:     }
                    121: 
                    122:     return 0;
                    123: }
                    124: 
                    125: /**
                    126:  * do_balloon(): Request VM to change its memory allocation
                    127:  */
                    128: int do_balloon(Monitor *mon, const QDict *params,
                    129:               MonitorCompletion cb, void *opaque)
                    130: {
                    131:     int ret;
                    132: 
                    133:     if (kvm_enabled() && !kvm_has_sync_mmu()) {
                    134:         qerror_report(QERR_KVM_MISSING_CAP, "synchronous MMU", "balloon");
                    135:         return -1;
                    136:     }
                    137: 
                    138:     ret = qemu_balloon(qdict_get_int(params, "value"), cb, opaque);
                    139:     if (ret == 0) {
                    140:         qerror_report(QERR_DEVICE_NOT_ACTIVE, "balloon");
                    141:         return -1;
                    142:     }
                    143: 
                    144:     cb(opaque, NULL);
                    145:     return 0;
                    146: }

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