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qemu: Set swap_hard_limit before hard_limit

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Setting hard_limit larger than previous swap_hard_limit must fail,
it's not that good if one wants to change the swap_hard_limit
and hard_limit together. E.g.

% virsh memtune rhel6
hard_limit     : 1000000
soft_limit     : 1000000
swap_hard_limit: 1000000

% virsh memtune rhel6 --hard-limit 1000020 --soft-limit 1000020 \
--swap-hard-limit 1000020 --live

This patch reorder the limits setting to set the swap_hard_limit
first, hard_limit then, and soft_limit last if it's greater than
current swap_hard_limit. And soft_limit first, hard_limit then,
swap_hard_limit last, if not.
This commit is contained in:
Osier Yang 2012-08-17 15:34:52 +08:00
parent ca9be83de9
commit 75e5bec97b
1 changed files with 61 additions and 6 deletions
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67
src/qemu/qemu_driver.c
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@ -6651,11 +6651,18 @@ qemuDomainSetMemoryParameters(virDomainPtr dom,
virDomainDefPtr persistentDef = NULL;
virCgroupPtr group = NULL;
virDomainObjPtr vm = NULL;
virTypedParameterPtr hard_limit = NULL;
virTypedParameterPtr swap_hard_limit = NULL;
int hard_limit_index = 0;
int swap_hard_limit_index = 0;
unsigned long long val = 0;
int ret = -1;
int rc;
virCheckFlags(VIR_DOMAIN_AFFECT_LIVE |
VIR_DOMAIN_AFFECT_CONFIG, -1);
if (virTypedParameterArrayValidate(params, nparams,
VIR_DOMAIN_MEMORY_HARD_LIMIT,
VIR_TYPED_PARAM_ULLONG,
@ -6694,13 +6701,61 @@ qemuDomainSetMemoryParameters(virDomainPtr dom,
}
}
for (i = 0; i < nparams; i++) {
if (STREQ(params[i].field, VIR_DOMAIN_MEMORY_HARD_LIMIT)) {
hard_limit = &params[i];
hard_limit_index = i;
} else if (STREQ(params[i].field, VIR_DOMAIN_MEMORY_SWAP_HARD_LIMIT)) {
swap_hard_limit = &params[i];
swap_hard_limit_index = i;
}
}
/* It will fail if hard limit greater than swap hard limit anyway */
if (swap_hard_limit &&
hard_limit &&
(hard_limit->value.ul > swap_hard_limit->value.ul)) {
virReportError(VIR_ERR_INVALID_ARG, "%s",
_("hard limit must be lower than swap hard limit"));
goto cleanup;
}
/* Get current swap hard limit */
rc = virCgroupGetMemSwapHardLimit(group, &val);
if (rc != 0) {
virReportSystemError(-rc, "%s",
_("unable to get swap hard limit"));
goto cleanup;
}
/* Swap hard_limit and swap_hard_limit to ensure the setting
* could succeed if both of them are provided.
*/
if (swap_hard_limit && hard_limit) {
virTypedParameter param;
if (swap_hard_limit->value.ul > val) {
if (hard_limit_index < swap_hard_limit_index) {
param = params[hard_limit_index];
params[hard_limit_index] = params[swap_hard_limit_index];
params[swap_hard_limit_index] = param;
}
} else {
if (hard_limit_index > swap_hard_limit_index) {
param = params[hard_limit_index];
params[hard_limit_index] = params[swap_hard_limit_index];
params[swap_hard_limit_index] = param;
}
}
}
ret = 0;
for (i = 0; i < nparams; i++) {
virTypedParameterPtr param = &params[i];
if (STREQ(param->field, VIR_DOMAIN_MEMORY_HARD_LIMIT)) {
if (flags & VIR_DOMAIN_AFFECT_LIVE) {
rc = virCgroupSetMemoryHardLimit(group, params[i].value.ul);
rc = virCgroupSetMemoryHardLimit(group, param->value.ul);
if (rc != 0) {
virReportSystemError(-rc, "%s",
_("unable to set memory hard_limit tunable"));
@ -6709,11 +6764,11 @@ qemuDomainSetMemoryParameters(virDomainPtr dom,
}
if (flags & VIR_DOMAIN_AFFECT_CONFIG) {
persistentDef->mem.hard_limit = params[i].value.ul;
persistentDef->mem.hard_limit = param->value.ul;
}
} else if (STREQ(param->field, VIR_DOMAIN_MEMORY_SOFT_LIMIT)) {
if (flags & VIR_DOMAIN_AFFECT_LIVE) {
rc = virCgroupSetMemorySoftLimit(group, params[i].value.ul);
rc = virCgroupSetMemorySoftLimit(group, param->value.ul);
if (rc != 0) {
virReportSystemError(-rc, "%s",
_("unable to set memory soft_limit tunable"));
@ -6722,11 +6777,11 @@ qemuDomainSetMemoryParameters(virDomainPtr dom,
}
if (flags & VIR_DOMAIN_AFFECT_CONFIG) {
persistentDef->mem.soft_limit = params[i].value.ul;
persistentDef->mem.soft_limit = param->value.ul;
}
} else if (STREQ(param->field, VIR_DOMAIN_MEMORY_SWAP_HARD_LIMIT)) {
if (flags & VIR_DOMAIN_AFFECT_LIVE) {
rc = virCgroupSetMemSwapHardLimit(group, params[i].value.ul);
rc = virCgroupSetMemSwapHardLimit(group, param->value.ul);
if (rc != 0) {
virReportSystemError(-rc, "%s",
_("unable to set swap_hard_limit tunable"));
@ -6734,7 +6789,7 @@ qemuDomainSetMemoryParameters(virDomainPtr dom,
}
}
if (flags & VIR_DOMAIN_AFFECT_CONFIG) {
persistentDef->mem.swap_hard_limit = params[i].value.ul;
persistentDef->mem.swap_hard_limit = param->value.ul;
}
}
}