3:48 a.m.
The command helps to control the memory/swap parameters for the system, for
eg. hard_limit (max memory the vm can use), soft_limit (limit during memory
contention), swap_hard_limit(max swap the vm can use)
Signed-off-by: Nikunj A. Dadhania <nikunj(a)linux.vnet.ibm.com>
---
src/libvirt_public.syms | 5 +++
tools/virsh.c | 89 +++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 94 insertions(+), 0 deletions(-)
diff --git a/src/libvirt_public.syms b/src/libvirt_public.syms
index 849c163..f33f14a 100644
--- a/src/libvirt_public.syms
+++ b/src/libvirt_public.syms
@@ -405,4 +405,9 @@ LIBVIRT_0.8.2 {
virDomainCreateWithFlags;
} LIBVIRT_0.8.1;
+LIBVIRT_0.8.5 {
+ global:
+ virDomainSetMemoryParameters;
+} LIBVIRT_0.8.2;
+
# .... define new API here using predicted next version number ....
diff --git a/tools/virsh.c b/tools/virsh.c
index 85014f2..8158f7c 100644
--- a/tools/virsh.c
+++ b/tools/virsh.c
@@ -2614,6 +2614,94 @@ cmdSetmaxmem(vshControl *ctl, const vshCmd *cmd)
}
/*
+ * "memtune" command
+ */
+static const vshCmdInfo info_memtune[] = {
+ {"help", N_("change memory paramters")},
+ {"desc", N_("Change the current memory paramters for the guest
domain.")},
+ {NULL, NULL}
+};
+
+static const vshCmdOptDef opts_memtune[] = {
+ {"domain", VSH_OT_DATA, VSH_OFLAG_REQ, N_("domain name, id or
uuid")},
+ {"hard_limit", VSH_OT_STRING, VSH_OFLAG_NONE, N_("Max memory in
kilobytes")},
+ {"soft_limit", VSH_OT_STRING, VSH_OFLAG_NONE, N_("Memory during
contention in kilobytes")},
+ {"swap_hard_limit", VSH_OT_STRING, VSH_OFLAG_NONE, N_("Max swap in
kilobytes")},
+ {NULL, 0, 0, NULL}
+};
+
+static int
+cmdMemtune(vshControl *ctl, const vshCmd *cmd)
+{
+ virDomainPtr dom;
+ int hard_limit, soft_limit, swap_hard_limit;
+ unsigned short nparams = 0;
+ unsigned int i = 0;
+ virMemoryParameterPtr params = NULL, temp = NULL;
+ int ret = FALSE;
+
+ if (!vshConnectionUsability(ctl, ctl->conn))
+ return FALSE;
+
+ if (!(dom = vshCommandOptDomain(ctl, cmd, NULL)))
+ return FALSE;
+
+ hard_limit = vshCommandOptInt(cmd, "hard_limit", &hard_limit);
+ if (hard_limit)
+ nparams++;
+
+ soft_limit = vshCommandOptInt(cmd, "soft_limit", &soft_limit);
+ if (soft_limit)
+ nparams++;
+
+ swap_hard_limit = vshCommandOptInt(cmd, "swap_hard_limit",
&swap_hard_limit);
+ if (swap_hard_limit)
+ nparams++;
+
+ if(nparams == 0) {
+ /* get the memory parameters */
+ vshError(ctl, _("virDomainGetMemoryParameters not implemented"));
+ } else {
+ /* set the memory parameters */
+ params = vshMalloc(ctl, sizeof(virMemoryParameter)* nparams);
+
+ memset(params, 0, sizeof(virMemoryParameter)* nparams);
+ for(i = 0; i < nparams; i++)
+ {
+ temp = ¶ms[i];
+ temp->type = VIR_DOMAIN_SCHED_FIELD_ULLONG;
+
+ /*
+ * Some magic here, this is used to fill the params structure with
+ * the valid arguments passed, after filling the particular
+ * argument we purposely make them 0, so on the next pass it goes
+ * to the next valid argument and so on.
+ */
+ if (soft_limit) {
+ temp->value.ul = soft_limit;
+ strncpy(temp->field, "soft_limit", sizeof(temp->field));
+ soft_limit = 0;
+ } else if (hard_limit) {
+ temp->value.ul = hard_limit;
+ strncpy(temp->field, "hard_limit", sizeof(temp->field));
+ hard_limit = 0;
+ } else if (swap_hard_limit) {
+ temp->value.ul = swap_hard_limit;
+ strncpy(temp->field, "swap_hard_limit",
sizeof(temp->field));
+ swap_hard_limit = 0;
+ }
+ }
+ if (virDomainSetMemoryParameters(dom, params, nparams) != 0)
+ vshError(ctl, "%s", _("Unable to change Memory
Parameters"));
+ else
+ ret = TRUE;
+ }
+
+ virDomainFree(dom);
+ return ret;
+}
+
+/*
* "nodeinfo" command
*/
static const vshCmdInfo info_nodeinfo[] = {
@@ -9431,6 +9519,7 @@ static const vshCmdDef commands[] = {
{"shutdown", cmdShutdown, opts_shutdown, info_shutdown},
{"setmem", cmdSetmem, opts_setmem, info_setmem},
{"setmaxmem", cmdSetmaxmem, opts_setmaxmem, info_setmaxmem},
+ {"memtune", cmdMemtune, opts_memtune, info_memtune},
{"setvcpus", cmdSetvcpus, opts_setvcpus, info_setvcpus},
{"suspend", cmdSuspend, opts_suspend, info_suspend},
{"ttyconsole", cmdTTYConsole, opts_ttyconsole, info_ttyconsole},