Annotation of qemu/balloon.c, revision 1.1.1.2

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"
1.1.1.2 ! root       32: #include "trace.h"
1.1       root       33: 
                     34: 
                     35: static QEMUBalloonEvent *qemu_balloon_event;
                     36: void *qemu_balloon_event_opaque;
                     37: 
                     38: void qemu_add_balloon_handler(QEMUBalloonEvent *func, void *opaque)
                     39: {
                     40:     qemu_balloon_event = func;
                     41:     qemu_balloon_event_opaque = opaque;
                     42: }
                     43: 
                     44: int qemu_balloon(ram_addr_t target, MonitorCompletion cb, void *opaque)
                     45: {
                     46:     if (qemu_balloon_event) {
1.1.1.2 ! root       47:         trace_balloon_event(qemu_balloon_event_opaque, target);
1.1       root       48:         qemu_balloon_event(qemu_balloon_event_opaque, target, cb, opaque);
                     49:         return 1;
                     50:     } else {
                     51:         return 0;
                     52:     }
                     53: }
                     54: 
                     55: int qemu_balloon_status(MonitorCompletion cb, void *opaque)
                     56: {
                     57:     if (qemu_balloon_event) {
                     58:         qemu_balloon_event(qemu_balloon_event_opaque, 0, cb, opaque);
                     59:         return 1;
                     60:     } else {
                     61:         return 0;
                     62:     }
                     63: }
                     64: 
                     65: static void print_balloon_stat(const char *key, QObject *obj, void *opaque)
                     66: {
                     67:     Monitor *mon = opaque;
                     68: 
                     69:     if (strcmp(key, "actual"))
                     70:         monitor_printf(mon, ",%s=%" PRId64, key,
                     71:                        qint_get_int(qobject_to_qint(obj)));
                     72: }
                     73: 
                     74: void monitor_print_balloon(Monitor *mon, const QObject *data)
                     75: {
                     76:     QDict *qdict;
                     77: 
                     78:     qdict = qobject_to_qdict(data);
                     79:     if (!qdict_haskey(qdict, "actual"))
                     80:         return;
                     81: 
                     82:     monitor_printf(mon, "balloon: actual=%" PRId64,
                     83:                    qdict_get_int(qdict, "actual") >> 20);
                     84:     qdict_iter(qdict, print_balloon_stat, mon);
                     85:     monitor_printf(mon, "\n");
                     86: }
                     87: 
                     88: /**
                     89:  * do_info_balloon(): Balloon information
                     90:  *
                     91:  * Make an asynchronous request for balloon info.  When the request completes
                     92:  * a QDict will be returned according to the following specification:
                     93:  *
                     94:  * - "actual": current balloon value in bytes
                     95:  * The following fields may or may not be present:
                     96:  * - "mem_swapped_in": Amount of memory swapped in (bytes)
                     97:  * - "mem_swapped_out": Amount of memory swapped out (bytes)
                     98:  * - "major_page_faults": Number of major faults
                     99:  * - "minor_page_faults": Number of minor faults
                    100:  * - "free_mem": Total amount of free and unused memory (bytes)
                    101:  * - "total_mem": Total amount of available memory (bytes)
                    102:  *
                    103:  * Example:
                    104:  *
                    105:  * { "actual": 1073741824, "mem_swapped_in": 0, "mem_swapped_out": 0,
                    106:  *   "major_page_faults": 142, "minor_page_faults": 239245,
                    107:  *   "free_mem": 1014185984, "total_mem": 1044668416 }
                    108:  */
                    109: int do_info_balloon(Monitor *mon, MonitorCompletion cb, void *opaque)
                    110: {
                    111:     int ret;
                    112: 
                    113:     if (kvm_enabled() && !kvm_has_sync_mmu()) {
                    114:         qerror_report(QERR_KVM_MISSING_CAP, "synchronous MMU", "balloon");
                    115:         return -1;
                    116:     }
                    117: 
                    118:     ret = qemu_balloon_status(cb, opaque);
                    119:     if (!ret) {
                    120:         qerror_report(QERR_DEVICE_NOT_ACTIVE, "balloon");
                    121:         return -1;
                    122:     }
                    123: 
                    124:     return 0;
                    125: }
                    126: 
                    127: /**
                    128:  * do_balloon(): Request VM to change its memory allocation
                    129:  */
                    130: int do_balloon(Monitor *mon, const QDict *params,
                    131:               MonitorCompletion cb, void *opaque)
                    132: {
                    133:     int ret;
                    134: 
                    135:     if (kvm_enabled() && !kvm_has_sync_mmu()) {
                    136:         qerror_report(QERR_KVM_MISSING_CAP, "synchronous MMU", "balloon");
                    137:         return -1;
                    138:     }
                    139: 
                    140:     ret = qemu_balloon(qdict_get_int(params, "value"), cb, opaque);
                    141:     if (ret == 0) {
                    142:         qerror_report(QERR_DEVICE_NOT_ACTIVE, "balloon");
                    143:         return -1;
                    144:     }
                    145: 
                    146:     cb(opaque, NULL);
                    147:     return 0;
                    148: }

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