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Re: [libvirt] [PATCH 10/12] [v2] virNodeGetMemoryStats: Implement remote protocol



On Tue, Jun 07, 2011 at 10:05:40AM +0900, Minoru Usui wrote:
> virNodeGetMemoryStats: Implement remote protocol
> 
> Signed-off-by: Minoru Usui <usui mxm nes nec co jp>
> ---
>  daemon/remote.c              |   77 ++++++++++++++++++++++++++++++++++++++++++
>  src/remote/remote_driver.c   |   65 +++++++++++++++++++++++++++++++++++
>  src/remote/remote_protocol.x |   22 +++++++++++-
>  3 files changed, 163 insertions(+), 1 deletions(-)
> 
> diff --git a/daemon/remote.c b/daemon/remote.c
> index 5b947af..1525db3 100644
> --- a/daemon/remote.c
> +++ b/daemon/remote.c
> @@ -1550,6 +1550,83 @@ no_memory:
>      goto cleanup;
>  }
>  
> +static int
> +remoteDispatchNodeGetMemoryStats (struct qemud_server *server ATTRIBUTE_UNUSED,
> +                                  struct qemud_client *client ATTRIBUTE_UNUSED,
> +                                  virConnectPtr conn,
> +                                  remote_message_header *hdr ATTRIBUTE_UNUSED,
> +                                  remote_error *rerr,
> +                                  remote_node_get_memory_stats_args *args,
> +                                  remote_node_get_memory_stats_ret *ret)
> +{
> +    virMemoryStatsPtr params = NULL;
> +    int i;
> +    int cellNum = args->cellNum;
> +    int nparams = args->nparams;
> +    unsigned int flags;
> +    int rv = -1;
> +
> +    if (!conn) {
> +        virNetError(VIR_ERR_INTERNAL_ERROR, "%s", _("connection not open"));
> +        goto cleanup;
> +    }
> +
> +    flags = args->flags;
> +
> +    if (nparams > REMOTE_NODE_MEMORY_STATS_MAX) {
> +        virNetError(VIR_ERR_INTERNAL_ERROR, "%s", _("nparams too large"));
> +        goto cleanup;
> +    }
> +    if (VIR_ALLOC_N(params, nparams) < 0) {
> +        virReportOOMError();
> +        goto cleanup;
> +    }
> +
> +    if (virNodeGetMemoryStats(conn, cellNum, params, &nparams, flags) < 0)
> +        goto cleanup;
> +
> +    /* In this case, we need to send back the number of parameters
> +     * supported
> +     */
> +    if (args->nparams == 0) {
> +        ret->nparams = nparams;
> +        goto success;
> +    }
> +
> +    /* Serialise the memory parameters. */
> +    ret->params.params_len = nparams;
> +    if (VIR_ALLOC_N(ret->params.params_val, nparams) < 0)
> +        goto no_memory;
> +
> +    for (i = 0; i < nparams; ++i) {
> +        /* remoteDispatchClientRequest will free this: */
> +        ret->params.params_val[i].field = strdup(params[i].field);
> +        if (ret->params.params_val[i].field == NULL)
> +            goto no_memory;
> +
> +        ret->params.params_val[i].value = params[i].value;
> +    }
> +
> +success:
> +    rv = 0;
> +
> +cleanup:
> +    if (rv < 0) {
> +        remoteDispatchError(rerr);
> +        if (ret->params.params_val) {
> +            for (i = 0; i < nparams; i++)
> +                VIR_FREE(ret->params.params_val[i].field);
> +            VIR_FREE(ret->params.params_val);
> +        }
> +    }
> +    VIR_FREE(params);
> +    return rv;
> +
> +no_memory:
> +    virReportOOMError();
> +    goto cleanup;
> +}
> +
>  /*-------------------------------------------------------------*/
>  
>  static int
> diff --git a/src/remote/remote_driver.c b/src/remote/remote_driver.c
> index c57c407..ef3f67d 100644
> --- a/src/remote/remote_driver.c
> +++ b/src/remote/remote_driver.c
> @@ -1763,6 +1763,70 @@ done:
>  }
>  
>  static int
> +remoteNodeGetMemoryStats (virConnectPtr conn,
> +                          int cellNum,
> +                          virMemoryStatsPtr params, int *nparams,
> +                          unsigned int flags)
> +{
> +    int rv = -1;
> +    remote_node_get_memory_stats_args args;
> +    remote_node_get_memory_stats_ret ret;
> +    int i = -1;
> +    struct private_data *priv = conn->privateData;
> +
> +    remoteDriverLock(priv);
> +
> +    args.nparams = *nparams;
> +    args.cellNum = cellNum;
> +    args.flags = flags;
> +
> +    memset (&ret, 0, sizeof ret);
> +    if (call (conn, priv, 0, REMOTE_PROC_NODE_GET_MEMORY_STATS,
> +              (xdrproc_t) xdr_remote_node_get_memory_stats_args, (char *) &args,
> +              (xdrproc_t) xdr_remote_node_get_memory_stats_ret, (char *) &ret) == -1)
> +        goto done;
> +
> +    /* Check the length of the returned list carefully. */
> +    if (ret.params.params_len > REMOTE_NODE_MEMORY_STATS_MAX ||
> +        ret.params.params_len > *nparams) {
> +        remoteError(VIR_ERR_RPC, "%s",
> +                    _("remoteNodeGetMemoryStats: "
> +                      "returned number of stats exceeds limit"));
> +        goto cleanup;
> +    }
> +    /* Handle the case when the caller does not know the number of stats
> +     * and is asking for the number of stats supported
> +     */
> +    if (*nparams == 0) {
> +        *nparams = ret.nparams;
> +        rv = 0;
> +        goto cleanup;
> +    }
> +
> +    *nparams = ret.params.params_len;
> +
> +    /* Deserialise the result. */
> +    for (i = 0; i < *nparams; ++i) {
> +        if (virStrcpyStatic(params[i].field, ret.params.params_val[i].field) == NULL) {
> +            remoteError(VIR_ERR_INTERNAL_ERROR,
> +                        _("Stats %s too big for destination"),
> +                        ret.params.params_val[i].field);
> +            goto cleanup;
> +        }
> +        params[i].value = ret.params.params_val[i].value;
> +    }
> +
> +    rv = 0;
> +
> +cleanup:
> +    xdr_free ((xdrproc_t) xdr_remote_node_get_memory_stats_ret,
> +              (char *) &ret);
> +done:
> +    remoteDriverUnlock(priv);
> +    return rv;
> +}
> +
> +static int
>  remoteNodeGetCellsFreeMemory(virConnectPtr conn,
>                              unsigned long long *freeMems,
>                              int startCell,
> @@ -6362,6 +6426,7 @@ static virDriver remote_driver = {
>      .domainMemoryPeek = remoteDomainMemoryPeek, /* 0.4.2 */
>      .domainGetBlockInfo = remoteDomainGetBlockInfo, /* 0.8.1 */
>      .nodeGetCPUStats = remoteNodeGetCPUStats, /* 0.9.3 */
> +    .nodeGetMemoryStats = remoteNodeGetMemoryStats, /* 0.9.3 */
>      .nodeGetCellsFreeMemory = remoteNodeGetCellsFreeMemory, /* 0.3.3 */
>      .nodeGetFreeMemory = remoteNodeGetFreeMemory, /* 0.3.3 */
>      .domainEventRegister = remoteDomainEventRegister, /* 0.5.0 */
> diff --git a/src/remote/remote_protocol.x b/src/remote/remote_protocol.x
> index 59a9d62..78b8c5f 100644
> --- a/src/remote/remote_protocol.x
> +++ b/src/remote/remote_protocol.x
> @@ -137,6 +137,9 @@ const REMOTE_DOMAIN_MEMORY_PARAMETERS_MAX = 16;
>  /* Upper limit on list of node cpu stats. */
>  const REMOTE_NODE_CPU_STATS_MAX = 16;
>  
> +/* Upper limit on list of node memory stats. */
> +const REMOTE_NODE_MEMORY_STATS_MAX = 16;
> +
>  /* Upper limit on number of NUMA cells */
>  const REMOTE_NODE_MAX_CELLS = 1024;
>  
> @@ -327,6 +330,11 @@ struct remote_node_get_cpu_stats {
>      unsigned hyper value;
>  };
>  
> +struct remote_node_get_memory_stats {
> +    remote_nonnull_string field;
> +    unsigned hyper value;
> +};
> +
>  /*----- Calls. -----*/
>  
>  /* For each call we may have a 'remote_CALL_args' and 'remote_CALL_ret'
> @@ -422,6 +430,17 @@ struct remote_node_get_cpu_stats_ret {
>      int nparams;
>  };
>  
> +struct remote_node_get_memory_stats_args {
> +    int nparams;
> +    int cellNum;
> +    unsigned int flags;
> +};
> +
> +struct remote_node_get_memory_stats_ret {
> +    remote_node_get_memory_stats params<REMOTE_NODE_MEMORY_STATS_MAX>;
> +    int nparams;
> +};
> +
>  struct remote_node_get_cells_free_memory_args {
>      int startCell;
>      int maxcells;
> @@ -2317,7 +2336,8 @@ enum remote_procedure {
>      REMOTE_PROC_INTERFACE_CHANGE_ROLLBACK = 222, /* autogen autogen */
>      REMOTE_PROC_DOMAIN_GET_SCHEDULER_PARAMETERS_FLAGS = 223, /* skipgen autogen */
>      REMOTE_PROC_DOMAIN_EVENT_CONTROL_ERROR = 224, /* skipgen skipgen */
> -    REMOTE_PROC_NODE_GET_CPU_STATS = 225 /* skipgen skipgen */
> +    REMOTE_PROC_NODE_GET_CPU_STATS = 225, /* skipgen skipgen */
> +    REMOTE_PROC_NODE_GET_MEMORY_STATS = 226 /* skipgen skipgen */
>  
>      /*
>       * Notice how the entries are grouped in sets of 10 ?

ACK

Daniel
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