[libvirt] [PATCH 2/6] qemu: use query-cpus-fast in JSON monitor
Peter Krempa
pkrempa at redhat.com
Fri Mar 2 11:33:22 UTC 2018
On Fri, Mar 02, 2018 at 10:29:07 +0100, Viktor Mihajlovski wrote:
> Use query-cpus-fast instead of query-cpus if supported by QEMU.
> Based on the QEMU_CAPS_QUERY_CPUS_FAST capability.
>
> Signed-off-by: Viktor Mihajlovski <mihajlov at linux.vnet.ibm.com>
> Reviewed-by: Boris Fiuczynski <fiuczy at linux.vnet.ibm.com>
> ---
> src/qemu/qemu_monitor.c | 10 ++++++++--
> src/qemu/qemu_monitor_json.c | 26 +++++++++++++++++---------
> src/qemu/qemu_monitor_json.h | 3 ++-
> tests/qemumonitorjsontest.c | 2 +-
> 4 files changed, 28 insertions(+), 13 deletions(-)
>
> diff --git a/src/qemu/qemu_monitor.c b/src/qemu/qemu_monitor.c
> index ad5c572..dad1383 100644
> --- a/src/qemu/qemu_monitor.c
> +++ b/src/qemu/qemu_monitor.c
> @@ -2012,6 +2012,7 @@ qemuMonitorGetCPUInfo(qemuMonitorPtr mon,
> int ret = -1;
> int rc;
> qemuMonitorCPUInfoPtr info = NULL;
> + bool fast;
>
> QEMU_CHECK_MONITOR(mon);
>
> @@ -2028,8 +2029,12 @@ qemuMonitorGetCPUInfo(qemuMonitorPtr mon,
> (qemuMonitorJSONGetHotpluggableCPUs(mon, &hotplugcpus, &nhotplugcpus)) < 0)
> goto cleanup;
>
> + fast = virQEMUCapsGet(QEMU_DOMAIN_PRIVATE(mon->vm)->qemuCaps,
Don't do this. You'll need to determine it sooner. The main reason being
that once you are in the monitor code, 'vm' is unlocked and should not
be accesssed. Also we don't access the VM object trhough the mon object
usually.
> + QEMU_CAPS_QUERY_CPUS_FAST);
> +
> if (mon->json)
> - rc = qemuMonitorJSONQueryCPUs(mon, &cpuentries, &ncpuentries, hotplug);
> + rc = qemuMonitorJSONQueryCPUs(mon, &cpuentries, &ncpuentries, hotplug,
> + fast);
> else
> rc = qemuMonitorTextQueryCPUs(mon, &cpuentries, &ncpuentries);
>
> @@ -2082,7 +2087,8 @@ qemuMonitorGetCpuHalted(qemuMonitorPtr mon,
> QEMU_CHECK_MONITOR_NULL(mon);
>
> if (mon->json)
> - rc = qemuMonitorJSONQueryCPUs(mon, &cpuentries, &ncpuentries, false);
> + rc = qemuMonitorJSONQueryCPUs(mon, &cpuentries, &ncpuentries, false,
> + false);
> else
> rc = qemuMonitorTextQueryCPUs(mon, &cpuentries, &ncpuentries);
>
> diff --git a/src/qemu/qemu_monitor_json.c b/src/qemu/qemu_monitor_json.c
> index a09e93e..2ecdf0a 100644
> --- a/src/qemu/qemu_monitor_json.c
> +++ b/src/qemu/qemu_monitor_json.c
> @@ -1466,7 +1466,8 @@ int qemuMonitorJSONSystemReset(qemuMonitorPtr mon)
> static int
> qemuMonitorJSONExtractCPUInfo(virJSONValuePtr data,
> struct qemuMonitorQueryCpusEntry **entries,
> - size_t *nentries)
> + size_t *nentries,
> + bool fast)
> {
> struct qemuMonitorQueryCpusEntry *cpus = NULL;
> int ret = -1;
> @@ -1491,11 +1492,13 @@ qemuMonitorJSONExtractCPUInfo(virJSONValuePtr data,
> }
>
> /* Some older qemu versions don't report the thread_id so treat this as
> - * non-fatal, simply returning no data */
> - ignore_value(virJSONValueObjectGetNumberInt(entry, "CPU", &cpuid));
> - ignore_value(virJSONValueObjectGetNumberInt(entry, "thread_id", &thread));
> + * non-fatal, simply returning no data.
> + * The return data of query-cpus-fast has different field names
> + */
> + ignore_value(virJSONValueObjectGetNumberInt(entry, fast ? "cpu-index" : "CPU", &cpuid));
> + ignore_value(virJSONValueObjectGetNumberInt(entry, fast ? "thread-id" : "thread_id", &thread));
No ternary operators please. Add an if-block and two code paths.
> ignore_value(virJSONValueObjectGetBoolean(entry, "halted", &halted));
> - qom_path = virJSONValueObjectGetString(entry, "qom_path");
> + qom_path = virJSONValueObjectGetString(entry, fast ? "qom-path" : "qom_path");
>
> cpus[i].qemu_id = cpuid;
> cpus[i].tid = thread;
> @@ -1520,10 +1523,12 @@ qemuMonitorJSONExtractCPUInfo(virJSONValuePtr data,
> * @mon: monitor object
> * @entries: filled with detected entries on success
> * @nentries: number of entries returned
> + * @force: force exit on error
> + * @fast: use query-cpus-fast
> *
> * Queries qemu for cpu-related information. Failure to execute the command or
> * extract results does not produce an error as libvirt can continue without
> - * this information.
> + * this information, unless the caller has specified @force == true.
> *
> * Returns 0 on success, -1 on a fatal error (oom ...) and -2 if the
> * query failed gracefully.
> @@ -1532,10 +1537,13 @@ int
> qemuMonitorJSONQueryCPUs(qemuMonitorPtr mon,
> struct qemuMonitorQueryCpusEntry **entries,
> size_t *nentries,
> - bool force)
> + bool force,
> + bool fast)
> {
> int ret = -1;
> - virJSONValuePtr cmd = qemuMonitorJSONMakeCommand("query-cpus", NULL);
> + virJSONValuePtr cmd =
> + qemuMonitorJSONMakeCommand(fast ? "query-cpus-fast" : "query-cpus",
> + NULL);
Same here, no ternaries please.
> virJSONValuePtr reply = NULL;
> virJSONValuePtr data;
>
> @@ -1553,7 +1561,7 @@ qemuMonitorJSONQueryCPUs(qemuMonitorPtr mon,
> goto cleanup;
> }
>
> - ret = qemuMonitorJSONExtractCPUInfo(data, entries, nentries);
> + ret = qemuMonitorJSONExtractCPUInfo(data, entries, nentries, fast);
>
> cleanup:
> virJSONValueFree(cmd);
> diff --git a/src/qemu/qemu_monitor_json.h b/src/qemu/qemu_monitor_json.h
> index ec243be..e03299a 100644
> --- a/src/qemu/qemu_monitor_json.h
> +++ b/src/qemu/qemu_monitor_json.h
> @@ -60,7 +60,8 @@ int qemuMonitorJSONSystemReset(qemuMonitorPtr mon);
> int qemuMonitorJSONQueryCPUs(qemuMonitorPtr mon,
> struct qemuMonitorQueryCpusEntry **entries,
> size_t *nentries,
> - bool force);
> + bool force,
> + bool fast);
> int qemuMonitorJSONGetVirtType(qemuMonitorPtr mon,
> virDomainVirtType *virtType);
> int qemuMonitorJSONUpdateVideoMemorySize(qemuMonitorPtr mon,
> diff --git a/tests/qemumonitorjsontest.c b/tests/qemumonitorjsontest.c
> index 908ec3a..6824623 100644
> --- a/tests/qemumonitorjsontest.c
> +++ b/tests/qemumonitorjsontest.c
> @@ -1420,7 +1420,7 @@ testQemuMonitorJSONqemuMonitorJSONQueryCPUs(const void *data)
> goto cleanup;
>
> if (qemuMonitorJSONQueryCPUs(qemuMonitorTestGetMonitor(test),
> - &cpudata, &ncpudata, true) < 0)
> + &cpudata, &ncpudata, true, false) < 0)
> goto cleanup;
>
> if (ncpudata != 4) {
> --
> 1.9.1
>
> --
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> libvir-list at redhat.com
> https://www.redhat.com/mailman/listinfo/libvir-list
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