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git.proxmox.com Git - qemu.git/blob - balloon.c
2 * Generic Balloon handlers and management
4 * Copyright (c) 2003-2008 Fabrice Bellard
5 * Copyright (C) 2011 Red Hat, Inc.
6 * Copyright (C) 2011 Amit Shah <amit.shah@redhat.com>
8 * Permission is hereby granted, free of charge, to any person obtaining a copy
9 * of this software and associated documentation files (the "Software"), to deal
10 * in the Software without restriction, including without limitation the rights
11 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
12 * copies of the Software, and to permit persons to whom the Software is
13 * furnished to do so, subject to the following conditions:
15 * The above copyright notice and this permission notice shall be included in
16 * all copies or substantial portions of the Software.
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
21 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
22 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
23 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
30 #include "cpu-common.h"
35 static QEMUBalloonEvent
*balloon_event_fn
;
36 static QEMUBalloonStatus
*balloon_stat_fn
;
37 static void *balloon_opaque
;
39 void qemu_add_balloon_handler(QEMUBalloonEvent
*event_func
,
40 QEMUBalloonStatus
*stat_func
, void *opaque
)
42 balloon_event_fn
= event_func
;
43 balloon_stat_fn
= stat_func
;
44 balloon_opaque
= opaque
;
47 static int qemu_balloon(ram_addr_t target
)
49 if (!balloon_event_fn
) {
52 trace_balloon_event(balloon_opaque
, target
);
53 balloon_event_fn(balloon_opaque
, target
);
57 static int qemu_balloon_status(MonitorCompletion cb
, void *opaque
)
59 if (!balloon_stat_fn
) {
62 balloon_stat_fn(balloon_opaque
, cb
, opaque
);
66 static void print_balloon_stat(const char *key
, QObject
*obj
, void *opaque
)
68 Monitor
*mon
= opaque
;
70 if (strcmp(key
, "actual")) {
71 monitor_printf(mon
, ",%s=%" PRId64
, key
,
72 qint_get_int(qobject_to_qint(obj
)));
76 void monitor_print_balloon(Monitor
*mon
, const QObject
*data
)
80 qdict
= qobject_to_qdict(data
);
81 if (!qdict_haskey(qdict
, "actual")) {
84 monitor_printf(mon
, "balloon: actual=%" PRId64
,
85 qdict_get_int(qdict
, "actual") >> 20);
86 qdict_iter(qdict
, print_balloon_stat
, mon
);
87 monitor_printf(mon
, "\n");
91 * do_info_balloon(): Balloon information
93 * Make an asynchronous request for balloon info. When the request completes
94 * a QDict will be returned according to the following specification:
96 * - "actual": current balloon value in bytes
97 * The following fields may or may not be present:
98 * - "mem_swapped_in": Amount of memory swapped in (bytes)
99 * - "mem_swapped_out": Amount of memory swapped out (bytes)
100 * - "major_page_faults": Number of major faults
101 * - "minor_page_faults": Number of minor faults
102 * - "free_mem": Total amount of free and unused memory (bytes)
103 * - "total_mem": Total amount of available memory (bytes)
107 * { "actual": 1073741824, "mem_swapped_in": 0, "mem_swapped_out": 0,
108 * "major_page_faults": 142, "minor_page_faults": 239245,
109 * "free_mem": 1014185984, "total_mem": 1044668416 }
111 int do_info_balloon(Monitor
*mon
, MonitorCompletion cb
, void *opaque
)
115 if (kvm_enabled() && !kvm_has_sync_mmu()) {
116 qerror_report(QERR_KVM_MISSING_CAP
, "synchronous MMU", "balloon");
120 ret
= qemu_balloon_status(cb
, opaque
);
122 qerror_report(QERR_DEVICE_NOT_ACTIVE
, "balloon");
130 * do_balloon(): Request VM to change its memory allocation
132 int do_balloon(Monitor
*mon
, const QDict
*params
,
133 MonitorCompletion cb
, void *opaque
)
137 if (kvm_enabled() && !kvm_has_sync_mmu()) {
138 qerror_report(QERR_KVM_MISSING_CAP
, "synchronous MMU", "balloon");
142 ret
= qemu_balloon(qdict_get_int(params
, "value"));
144 qerror_report(QERR_DEVICE_NOT_ACTIVE
, "balloon");