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Re: [Qemu-devel] [PATCH v2] hmp, qmp: introduce "info memory" and "query
From: |
Dr. David Alan Gilbert |
Subject: |
Re: [Qemu-devel] [PATCH v2] hmp, qmp: introduce "info memory" and "query-memory" commands |
Date: |
Wed, 14 Jun 2017 10:22:30 +0100 |
User-agent: |
Mutt/1.8.2 (2017-04-18) |
* Vadim Galitsyn (address@hidden) wrote:
> Commands above provide the following memory information in bytes:
>
> * base-memory - amount of static memory specified
> with '-m' option at the start of the QEMU process.
>
> * hot-plug-memory - amount of memory that was hot-plugged.
>
> * ballooned-actual-memory - size of the memory that remains
> available to the guest after ballooning, as reported by the
> guest. If the guest has not reported its memory, this value
> equals to @base-memory + @hot-plug-memory. If ballooning
> is not enabled, zero value is reported.
>
> NOTE:
>
> Parameter @ballooned-actual-memory reports the same as
> "info balloon" command when ballooning is enabled. The idea
> to have it in scope of this command(s) comes from
> https://lists.gnu.org/archive/html/qemu-devel/2012-07/msg01472.html.
>
> Signed-off-by: Vasilis Liaskovitis <address@hidden>
> Signed-off-by: Mohammed Gamal <address@hidden>
> Signed-off-by: Eduardo Otubo <address@hidden>
> Signed-off-by: Vadim Galitsyn <address@hidden>
> Reviewed-by: Eugene Crosser <address@hidden>
> Cc: Dr. David Alan Gilbert <address@hidden>
> Cc: Markus Armbruster <address@hidden>
> Cc: address@hidden
> ---
>
> v2:
> * Fixed build for targets which do not have CONFIG_MEM_HOTPLUG enabled.
>
> hmp-commands-info.hx | 15 +++++++++++++++
> hmp.c | 14 ++++++++++++++
> hmp.h | 1 +
> qapi-schema.json | 27 +++++++++++++++++++++++++++
> qmp.c | 34 ++++++++++++++++++++++++++++++++++
> 5 files changed, 91 insertions(+)
>
> diff --git a/hmp-commands-info.hx b/hmp-commands-info.hx
> index ae169011b1..bc37525550 100644
> --- a/hmp-commands-info.hx
> +++ b/hmp-commands-info.hx
> @@ -833,6 +833,21 @@ STEXI
> @end table
> ETEXI
>
> +STEXI
> address@hidden info memory
> address@hidden memory
> +Display total memory size in bytes (static, hotplugged, ballooned)
> +ETEXI
> +
> + {
> + .name = "memory",
> + .args_type = "",
> + .params = "",
> + .help = "show memory size information in bytes (static, "
> + "hotplugged, ballooned)",
> + .cmd = hmp_info_memory,
> + },
> +
> STEXI
> @end table
> ETEXI
> diff --git a/hmp.c b/hmp.c
> index 8c72c58b20..81e383f169 100644
> --- a/hmp.c
> +++ b/hmp.c
> @@ -2817,3 +2817,17 @@ void hmp_info_vm_generation_id(Monitor *mon, const
> QDict *qdict)
> hmp_handle_error(mon, &err);
> qapi_free_GuidInfo(info);
> }
> +
> +void hmp_info_memory(Monitor *mon, const QDict *qdict)
> +{
> + Error *err = NULL;
> + MemoryInfo *info = qmp_query_memory(&err);
> + if (info) {
> + monitor_printf(mon, "base-memory: %lu\n", info->base_memory);
> + monitor_printf(mon, "hot-plug-memory: %lu\n", info->hot_plug_memory);
> + monitor_printf(mon, "ballooned-actual-memory: %lu\n",
> + info->ballooned_actual_memory);
I think you need to use the PRIu64 macros rather than 'lu' for the types
of the ints there to keep it portable.
Other than that; please add a test entry to tests/test-hmp.c
and I'm guessing you'll also need a qmp test for it.
Dave
> + g_free(info);
> + }
> + hmp_handle_error(mon, &err);
> +}
> diff --git a/hmp.h b/hmp.h
> index d8b94ce9dc..c422aa2fac 100644
> --- a/hmp.h
> +++ b/hmp.h
> @@ -143,5 +143,6 @@ void hmp_info_dump(Monitor *mon, const QDict *qdict);
> void hmp_info_ramblock(Monitor *mon, const QDict *qdict);
> void hmp_hotpluggable_cpus(Monitor *mon, const QDict *qdict);
> void hmp_info_vm_generation_id(Monitor *mon, const QDict *qdict);
> +void hmp_info_memory(Monitor *mon, const QDict *qdict);
>
> #endif
> diff --git a/qapi-schema.json b/qapi-schema.json
> index 4b50b652d3..33cd7cb3b8 100644
> --- a/qapi-schema.json
> +++ b/qapi-schema.json
> @@ -4324,6 +4324,33 @@
> 'data': { 'name': 'str', '*migration-safe': 'bool', 'static': 'bool',
> '*unavailable-features': [ 'str' ], 'typename': 'str' } }
>
> +##
> +# @MemoryInfo:
> +#
> +# Memory information in bytes.
> +#
> +# @base-memory: size of static memory which was specified on Qemu start.
> +#
> +# @hot-plug-memory: size of hot-plugged memory.
> +#
> +# @ballooned-actual-memory: amount of guest memory available after
> ballooning.
> +#
> +# Since: 2.10.0
> +##
> +{ 'struct': 'MemoryInfo',
> + 'data' : { 'base-memory': 'int', 'hot-plug-memory': 'int',
> + 'ballooned-actual-memory': 'int' } }
> +
> +##
> +# @query-memory:
> +#
> +# Return memory size information which includes
> +# static, hotplugged and ballooned memory.
> +#
> +# Since: 2.10.0
> +##
> +{ 'command': 'query-memory', 'returns': 'MemoryInfo' }
> +
> ##
> # @query-cpu-definitions:
> #
> diff --git a/qmp.c b/qmp.c
> index 7ee9bcfdcf..7e57a9bbf9 100644
> --- a/qmp.c
> +++ b/qmp.c
> @@ -712,3 +712,37 @@ ACPIOSTInfoList *qmp_query_acpi_ospm_status(Error **errp)
>
> return head;
> }
> +
> +MemoryInfo *qmp_query_memory(Error **errp)
> +{
> +#ifdef CONFIG_MEM_HOTPLUG
> + MemoryInfo *mem_info = g_malloc0(sizeof(MemoryInfo));
> + BalloonInfo *balloon_info;
> + Error *local_err = NULL;
> +
> + mem_info->base_memory = ram_size;
> + mem_info->hot_plug_memory = pc_existing_dimms_capacity(&local_err);
> + if (local_err) {
> + error_setg(errp, "could not get hot-plug memory info: %s",
> + error_get_pretty(local_err));
> + g_free(mem_info);
> + return NULL;
> + }
> +
> + /* In case if it is not possible to get balloon info, just ignore it. */
> + balloon_info = qmp_query_balloon(&local_err);
> + if (local_err) {
> + mem_info->ballooned_actual_memory = 0;
> + error_free(local_err);
> + } else {
> + mem_info->ballooned_actual_memory = balloon_info->actual;
> + }
> +
> + qapi_free_BalloonInfo(balloon_info);
> +
> + return mem_info;
> +#else
> + error_setg(errp, "command not supported for this configuration");
> + return NULL;
> +#endif
> +}
> --
> 2.13.1.394.g41dd433
>
--
Dr. David Alan Gilbert / address@hidden / Manchester, UK
- [Qemu-devel] [PATCH v2] hmp, qmp: introduce "info memory" and "query-memory" commands, Vadim Galitsyn, 2017/06/13
- Re: [Qemu-devel] [PATCH v2] hmp, qmp: introduce "info memory" and "query-memory" commands, no-reply, 2017/06/13
- Re: [Qemu-devel] [PATCH v2] hmp, qmp: introduce "info memory" and "query-memory" commands,
Dr. David Alan Gilbert <=
- Re: [Qemu-devel] [PATCH v2] hmp, qmp: introduce "info memory" and "query-memory" commands, Vadim Galitsyn, 2017/06/14
- Re: [Qemu-devel] [PATCH v2] hmp, qmp: introduce "info memory" and "query-memory" commands, Dr. David Alan Gilbert, 2017/06/14
- Re: [Qemu-devel] [PATCH v2] hmp, qmp: introduce "info memory" and "query-memory" commands, Markus Armbruster, 2017/06/20
- Re: [Qemu-devel] [PATCH v2] hmp, qmp: introduce "info memory" and "query-memory" commands, Vadim Galitsyn, 2017/06/22
- Re: [Qemu-devel] [PATCH v2] hmp, qmp: introduce "info memory" and "query-memory" commands, Markus Armbruster, 2017/06/23