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Diffstat (limited to 'balloon.c')
| -rw-r--r-- | balloon.c | 146 |
1 files changed, 146 insertions, 0 deletions
diff --git a/balloon.c b/balloon.c new file mode 100644 index 0000000..8e0b7f1 --- /dev/null +++ b/balloon.c @@ -0,0 +1,146 @@ +/* + * QEMU System Emulator + * + * Copyright (c) 2003-2008 Fabrice Bellard + * + * Permission is hereby granted, free of charge, to any person obtaining a copy + * of this software and associated documentation files (the "Software"), to deal + * in the Software without restriction, including without limitation the rights + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell + * copies of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN + * THE SOFTWARE. + */ + +#include "sysemu.h" +#include "monitor.h" +#include "qjson.h" +#include "qint.h" +#include "cpu-common.h" +#include "kvm.h" +#include "balloon.h" + + +static QEMUBalloonEvent *qemu_balloon_event; +void *qemu_balloon_event_opaque; + +void qemu_add_balloon_handler(QEMUBalloonEvent *func, void *opaque) +{ + qemu_balloon_event = func; + qemu_balloon_event_opaque = opaque; +} + +int qemu_balloon(ram_addr_t target, MonitorCompletion cb, void *opaque) +{ + if (qemu_balloon_event) { + qemu_balloon_event(qemu_balloon_event_opaque, target, cb, opaque); + return 1; + } else { + return 0; + } +} + +int qemu_balloon_status(MonitorCompletion cb, void *opaque) +{ + if (qemu_balloon_event) { + qemu_balloon_event(qemu_balloon_event_opaque, 0, cb, opaque); + return 1; + } else { + return 0; + } +} + +static void print_balloon_stat(const char *key, QObject *obj, void *opaque) +{ + Monitor *mon = opaque; + + if (strcmp(key, "actual")) + monitor_printf(mon, ",%s=%" PRId64, key, + qint_get_int(qobject_to_qint(obj))); +} + +void monitor_print_balloon(Monitor *mon, const QObject *data) +{ + QDict *qdict; + + qdict = qobject_to_qdict(data); + if (!qdict_haskey(qdict, "actual")) + return; + + monitor_printf(mon, "balloon: actual=%" PRId64, + qdict_get_int(qdict, "actual") >> 20); + qdict_iter(qdict, print_balloon_stat, mon); + monitor_printf(mon, "\n"); +} + +/** + * do_info_balloon(): Balloon information + * + * Make an asynchronous request for balloon info. When the request completes + * a QDict will be returned according to the following specification: + * + * - "actual": current balloon value in bytes + * The following fields may or may not be present: + * - "mem_swapped_in": Amount of memory swapped in (bytes) + * - "mem_swapped_out": Amount of memory swapped out (bytes) + * - "major_page_faults": Number of major faults + * - "minor_page_faults": Number of minor faults + * - "free_mem": Total amount of free and unused memory (bytes) + * - "total_mem": Total amount of available memory (bytes) + * + * Example: + * + * { "actual": 1073741824, "mem_swapped_in": 0, "mem_swapped_out": 0, + * "major_page_faults": 142, "minor_page_faults": 239245, + * "free_mem": 1014185984, "total_mem": 1044668416 } + */ +int do_info_balloon(Monitor *mon, MonitorCompletion cb, void *opaque) +{ + int ret; + + if (kvm_enabled() && !kvm_has_sync_mmu()) { + qerror_report(QERR_KVM_MISSING_CAP, "synchronous MMU", "balloon"); + return -1; + } + + ret = qemu_balloon_status(cb, opaque); + if (!ret) { + qerror_report(QERR_DEVICE_NOT_ACTIVE, "balloon"); + return -1; + } + + return 0; +} + +/** + * do_balloon(): Request VM to change its memory allocation + */ +int do_balloon(Monitor *mon, const QDict *params, + MonitorCompletion cb, void *opaque) +{ + int ret; + + if (kvm_enabled() && !kvm_has_sync_mmu()) { + qerror_report(QERR_KVM_MISSING_CAP, "synchronous MMU", "balloon"); + return -1; + } + + ret = qemu_balloon(qdict_get_int(params, "value"), cb, opaque); + if (ret == 0) { + qerror_report(QERR_DEVICE_NOT_ACTIVE, "balloon"); + return -1; + } + + cb(opaque, NULL); + return 0; +} |