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Add ballooning infrastructure. 

Balloon devices allow you to ask the guest to allocate memory.  This allows you
to release that memory.  It's mostly useful for freeing up large chunks of
memory from cooperative guests.

Ballooning is supported by both Xen and VirtIO.

Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>



git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5873 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
aliguori 2008-12-04 20:19:35 +00:00
parent 8d371d4bce
commit df751fa8bf
2 changed files with 48 additions and 0 deletions
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22
monitor.c
View File

@ -34,6 +34,7 @@
#include "block.h"
#include "audio/audio.h"
#include "disas.h"
#include "balloon.h"
#include <dirent.h>
#include "qemu-timer.h"
#include "migration.h"
@ -1390,6 +1391,23 @@ static void do_inject_nmi(int cpu_index)
}
#endif
static void do_balloon(int value)
{
ram_addr_t target = value;
qemu_balloon(target << 20);
}
static void do_info_balloon(void)
{
ram_addr_t actual;
actual = qemu_balloon_status();
if (actual == 0)
term_printf("Ballooning not activated in VM\n");
else
term_printf("balloon: actual=%d\n", (int)(actual >> 20));
}
static const term_cmd_t term_cmds[] = {
{ "help|?", "s?", do_help,
"[cmd]", "show the help" },
@ -1475,6 +1493,8 @@ static const term_cmd_t term_cmds[] = {
"", "cancel the current VM migration" },
{ "migrate_set_speed", "s", do_migrate_set_speed,
"value", "set maximum speed (in bytes) for migrations" },
{ "balloon", "i", do_balloon,
"target", "request VM to change it's memory allocation (in MB)" },
{ NULL, NULL, },
};
@ -1542,6 +1562,8 @@ static const term_cmd_t info_cmds[] = {
"", "show SLIRP statistics", },
#endif
{ "migrate", "", do_info_migrate, "", "show migration status" },
{ "balloon", "", do_info_balloon,
"", "show balloon information" },
{ NULL, NULL, },
};

26
vl.c
View File

@ -40,6 +40,7 @@
#include "audio/audio.h"
#include "migration.h"
#include "kvm.h"
#include "balloon.h"
#include <unistd.h>
#include <fcntl.h>
@ -514,6 +515,31 @@ void hw_error(const char *fmt, ...)
va_end(ap);
abort();
}
/***************/
/* ballooning */
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;
}
void qemu_balloon(ram_addr_t target)
{
if (qemu_balloon_event)
qemu_balloon_event(qemu_balloon_event_opaque, target);
}
ram_addr_t qemu_balloon_status(void)
{
if (qemu_balloon_event)
return qemu_balloon_event(qemu_balloon_event_opaque, 0);
return 0;
}
/***********************************************************/
/* keyboard/mouse */