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qemu: Set reasonable RSS limit on domain startup

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If there's a memory leak in qemu or qemu is exploited the host's
system will sooner or later start trashing instead of killing
the bad process. This however has impact on performance and other
guests as well. Therefore we should set a reasonable RSS limit
even when user hasn't set any. It's better to be secure by default.
This commit is contained in:
Michal Privoznik 2012-07-17 18:38:47 +02:00
parent e534ec66dc
commit addeb7cd05
1 changed files with 46 additions and 34 deletions
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80
src/qemu/qemu_cgroup.c
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@ -339,42 +339,54 @@ int qemuSetupCgroup(struct qemud_driver *driver,
}
}
if (vm->def->mem.hard_limit != 0 ||
vm->def->mem.soft_limit != 0 ||
vm->def->mem.swap_hard_limit != 0) {
if (qemuCgroupControllerActive(driver, VIR_CGROUP_CONTROLLER_MEMORY)) {
if (vm->def->mem.hard_limit != 0) {
rc = virCgroupSetMemoryHardLimit(cgroup, vm->def->mem.hard_limit);
if (rc != 0) {
virReportSystemError(-rc,
_("Unable to set memory hard limit for domain %s"),
vm->def->name);
goto cleanup;
}
}
if (vm->def->mem.soft_limit != 0) {
rc = virCgroupSetMemorySoftLimit(cgroup, vm->def->mem.soft_limit);
if (rc != 0) {
virReportSystemError(-rc,
_("Unable to set memory soft limit for domain %s"),
vm->def->name);
goto cleanup;
}
}
if (qemuCgroupControllerActive(driver, VIR_CGROUP_CONTROLLER_MEMORY)) {
unsigned long long hard_limit = vm->def->mem.hard_limit;
if (vm->def->mem.swap_hard_limit != 0) {
rc = virCgroupSetMemSwapHardLimit(cgroup, vm->def->mem.swap_hard_limit);
if (rc != 0) {
virReportSystemError(-rc,
_("Unable to set swap hard limit for domain %s"),
vm->def->name);
goto cleanup;
}
}
} else {
virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
_("Memory cgroup is not available on this host"));
if (!hard_limit) {
/* If there is no hard_limit set, set a reasonable
* one to avoid system trashing caused by exploited qemu.
* As 'reasonable limit' has been chosen:
* (1 + k) * (domain memory + total video memory) + F
* where k = 0.02 and F = 200MB. */
hard_limit = vm->def->mem.max_balloon;
for (i = 0; i < vm->def->nvideos; i++)
hard_limit += vm->def->videos[i]->vram;
hard_limit = hard_limit * 1.02 + 204800;
}
rc = virCgroupSetMemoryHardLimit(cgroup, hard_limit);
if (rc != 0) {
virReportSystemError(-rc,
_("Unable to set memory hard limit for domain %s"),
vm->def->name);
goto cleanup;
}
if (vm->def->mem.soft_limit != 0) {
rc = virCgroupSetMemorySoftLimit(cgroup, vm->def->mem.soft_limit);
if (rc != 0) {
virReportSystemError(-rc,
_("Unable to set memory soft limit for domain %s"),
vm->def->name);
goto cleanup;
}
}
if (vm->def->mem.swap_hard_limit != 0) {
rc = virCgroupSetMemSwapHardLimit(cgroup, vm->def->mem.swap_hard_limit);
if (rc != 0) {
virReportSystemError(-rc,
_("Unable to set swap hard limit for domain %s"),
vm->def->name);
goto cleanup;
}
}
} else if (vm->def->mem.hard_limit != 0 ||
vm->def->mem.soft_limit != 0 ||
vm->def->mem.swap_hard_limit != 0) {
virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
_("Memory cgroup is not available on this host"));
} else {
VIR_WARN("Could not autoset a RSS limit for domain %s", vm->def->name);
}
if (vm->def->cputune.shares != 0) {