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Add qemuProcessSetEmulatorAffinites and set emulator threads affinities

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Emulator threads should also be pinned by sched_setaffinity(), just
the same as vcpu threads.

Signed-off-by: Tang Chen <tangchen@cn.fujitsu.com>
Signed-off-by: Hu Tao <hutao@cn.fujitsu.com>
This commit is contained in:
Tang Chen 2012-08-21 17:18:34 +08:00 committed by Daniel Veillard
parent a1249489ce
commit 6db98e8a3f
1 changed files with 54 additions and 0 deletions
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54
src/qemu/qemu_process.c
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@ -2002,6 +2002,56 @@ cleanup:
return ret;
}
/* Set CPU affinities for emulator threads if emulatorpin xml provided. */
static int
qemuProcessSetEmulatorAffinites(virConnectPtr conn,
virDomainObjPtr vm)
{
virDomainDefPtr def = vm->def;
pid_t pid = vm->pid;
unsigned char *cpumask = NULL;
unsigned char *cpumap = NULL;
virNodeInfo nodeinfo;
int cpumaplen, hostcpus, maxcpu, i;
int ret = -1;
if (virNodeGetInfo(conn, &nodeinfo) != 0)
return -1;
if (!def->cputune.emulatorpin)
return 0;
hostcpus = VIR_NODEINFO_MAXCPUS(nodeinfo);
cpumaplen = VIR_CPU_MAPLEN(hostcpus);
maxcpu = cpumaplen * CHAR_BIT;
if (maxcpu > hostcpus)
maxcpu = hostcpus;
if (VIR_ALLOC_N(cpumap, cpumaplen) < 0) {
virReportOOMError();
return -1;
}
cpumask = (unsigned char *)def->cputune.emulatorpin->cpumask;
for (i = 0; i < VIR_DOMAIN_CPUMASK_LEN; i++) {
if (cpumask[i])
VIR_USE_CPU(cpumap, i);
}
if (virProcessInfoSetAffinity(pid,
cpumap,
cpumaplen,
maxcpu) < 0) {
goto cleanup;
}
ret = 0;
cleanup:
VIR_FREE(cpumap);
return ret;
}
static int
qemuProcessInitPasswords(virConnectPtr conn,
struct qemud_driver *driver,
@ -3763,6 +3813,10 @@ int qemuProcessStart(virConnectPtr conn,
if (qemuProcessSetVcpuAffinites(conn, vm) < 0)
goto cleanup;
VIR_DEBUG("Setting affinity of emulator threads");
if (qemuProcessSetEmulatorAffinites(conn, vm) < 0)
goto cleanup;
VIR_DEBUG("Setting any required VM passwords");
if (qemuProcessInitPasswords(conn, driver, vm) < 0)
goto cleanup;