From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.6 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7B496CA9EA0 for ; Tue, 22 Oct 2019 07:09:23 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 30E9D21872 for ; Tue, 22 Oct 2019 07:09:23 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="Wa3Heb4G" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 30E9D21872 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:50878 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1iMoIE-00035e-6w for qemu-devel@archiver.kernel.org; Tue, 22 Oct 2019 03:09:22 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:37876) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1iMoHG-0002MD-O1 for qemu-devel@nongnu.org; Tue, 22 Oct 2019 03:08:25 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1iMoHA-0007OH-Bx for qemu-devel@nongnu.org; Tue, 22 Oct 2019 03:08:22 -0400 Received: from us-smtp-delivery-1.mimecast.com ([205.139.110.120]:32947 helo=us-smtp-1.mimecast.com) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1iMoHA-0007Nv-6k for qemu-devel@nongnu.org; Tue, 22 Oct 2019 03:08:16 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1571728095; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=heehlP3EUuQWfwhVkW0r0YOj4KYjf3oW+S41qzFoqhU=; b=Wa3Heb4G7ETyui6vFFD/4rdaAShc9reYvYrAuvzmqG0xqH9ML4FWy59yZ1LrqjFu5f4ywt IygSN07YiDgxv3uVbBaR6/UBERtP3AM3HNTocy7DY9pddrRJBfozB+jFDCm0i8v4iIzPFJ 1PgtUrDa2mq68rirMFfBoiq48aZqJtc= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-88-yrqk8n1wPKepu54KY_d6Og-1; Tue, 22 Oct 2019 03:08:08 -0400 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.phx2.redhat.com [10.5.11.16]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 6BC30107AD31; Tue, 22 Oct 2019 07:08:07 +0000 (UTC) Received: from localhost (unknown [10.43.2.182]) by smtp.corp.redhat.com (Postfix) with ESMTP id 992455C1D4; Tue, 22 Oct 2019 07:08:05 +0000 (UTC) Date: Tue, 22 Oct 2019 09:08:03 +0200 From: Igor Mammedov To: Tao Xu Subject: Re: [PATCH v13 06/12] numa: Extend CLI to provide memory latency and bandwidth information Message-ID: <20191022090803.51731313@redhat.com> In-Reply-To: <20191020111125.27659-7-tao3.xu@intel.com> References: <20191020111125.27659-1-tao3.xu@intel.com> <20191020111125.27659-7-tao3.xu@intel.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 X-MC-Unique: yrqk8n1wPKepu54KY_d6Og-1 X-Mimecast-Spam-Score: 0 Content-Type: text/plain; charset=WINDOWS-1252 Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 205.139.110.120 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: ehabkost@redhat.com, jingqi.liu@intel.com, fan.du@intel.com, qemu-devel@nongnu.org, jonathan.cameron@huawei.com Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On Sun, 20 Oct 2019 19:11:19 +0800 Tao Xu wrote: > From: Liu Jingqi >=20 > Add -numa hmat-lb option to provide System Locality Latency and > Bandwidth Information. These memory attributes help to build > System Locality Latency and Bandwidth Information Structure(s) > in ACPI Heterogeneous Memory Attribute Table (HMAT). >=20 > Signed-off-by: Liu Jingqi > Signed-off-by: Tao Xu > --- >=20 > Changes in v13: > - Reuse Garray to store the raw bandwidth and bandwidth data > - Calculate common base unit using range bitmap (Igor) > --- > hw/core/numa.c | 127 ++++++++++++++++++++++++++++++++++++++++++ > include/sysemu/numa.h | 68 ++++++++++++++++++++++ > qapi/machine.json | 95 ++++++++++++++++++++++++++++++- > qemu-options.hx | 49 +++++++++++++++- > 4 files changed, 336 insertions(+), 3 deletions(-) >=20 > diff --git a/hw/core/numa.c b/hw/core/numa.c > index eba66ab768..3cf77f6ac9 100644 > --- a/hw/core/numa.c > +++ b/hw/core/numa.c > @@ -23,6 +23,7 @@ > */ > =20 > #include "qemu/osdep.h" > +#include "qemu/units.h" > #include "sysemu/hostmem.h" > #include "sysemu/numa.h" > #include "sysemu/sysemu.h" > @@ -198,6 +199,119 @@ void parse_numa_distance(MachineState *ms, NumaDist= Options *dist, Error **errp) > ms->numa_state->have_numa_distance =3D true; > } > =20 > +void parse_numa_hmat_lb(NumaState *numa_state, NumaHmatLBOptions *node, > + Error **errp) > +{ > + int first_bit, last_bit; > + uint64_t temp_latency; > + NodeInfo *numa_info =3D numa_state->nodes; > + HMAT_LB_Info *hmat_lb =3D > + numa_state->hmat_lb[node->hierarchy][node->data_type]; > + HMAT_LB_Data lb_data; > + > + /* Error checking */ > + if (node->initiator >=3D numa_state->num_nodes) { > + error_setg(errp, "Invalid initiator=3D%d, it should be less than= %d.", > + node->initiator, numa_state->num_nodes); > + return; > + } > + if (node->target >=3D numa_state->num_nodes) { > + error_setg(errp, "Invalid target=3D%d, it should be less than %d= .", > + node->target, numa_state->num_nodes); > + return; > + } > + if (!numa_info[node->initiator].has_cpu) { > + error_setg(errp, "Invalid initiator=3D%d, it isn't an " > + "initiator proximity domain.", node->initiator); > + return; > + } > + if (!numa_info[node->target].present) { > + error_setg(errp, "Invalid target=3D%d, it hasn't a valid NUMA no= de.", > + node->target); > + return; > + } > + > + if (!hmat_lb) { > + hmat_lb =3D g_malloc0(sizeof(*hmat_lb)); > + numa_state->hmat_lb[node->hierarchy][node->data_type] =3D hmat_l= b; > + hmat_lb->latency =3D g_array_new(false, true, sizeof(HMAT_LB_Dat= a)); > + hmat_lb->bandwidth =3D g_array_new(false, true, sizeof(HMAT_LB_D= ata)); > + } > + hmat_lb->hierarchy =3D node->hierarchy; > + hmat_lb->data_type =3D node->data_type; > + lb_data.initiator =3D node->initiator; > + lb_data.target =3D node->target; > + > + /* Input latency data */ > + if (node->data_type <=3D HMATLB_DATA_TYPE_WRITE_LATENCY) { > + if (!node->has_latency) { > + error_setg(errp, "Missing 'latency' option."); > + return; > + } > + if (node->has_bandwidth) { > + error_setg(errp, "Invalid option 'bandwidth' since " > + "the data type is latency."); > + return; > + } > + > + temp_latency =3D node->latency; > + hmat_lb->base_latency =3D 1; > + while (QEMU_IS_ALIGNED(temp_latency, 10)) { > + temp_latency /=3D 10; > + hmat_lb->base_latency *=3D 10; > + } > + > + if (temp_latency >=3D UINT64_MAX) { ^ ^^^^ doesn't make sense can't you use range bitmap here as well? > + error_setg(errp, "Latency %" PRIu64 " between initiator=3D%d= and " > + "target=3D%d should not differ from previously en= tered " > + "values on more than %d.", node->latency, > + node->initiator, node->target, UINT16_MAX - 1); > + return; > + } > + if (temp_latency > hmat_lb->range_left_la) { > + hmat_lb->range_left_la =3D temp_latency; > + } > + > + lb_data.rawdata =3D node->latency; > + g_array_append_val(hmat_lb->latency, lb_data); > + } > + > + /* Input bandwidth data */ > + if (node->data_type >=3D HMATLB_DATA_TYPE_ACCESS_BANDWIDTH) { > + if (!node->has_bandwidth) { > + error_setg(errp, "Missing 'bandwidth' option."); > + return; > + } > + if (node->has_latency) { > + error_setg(errp, "Invalid option 'latency' since " > + "the data type is bandwidth."); > + return; > + } > + if (!QEMU_IS_ALIGNED(node->bandwidth, MiB)) { > + error_setg(errp, "Bandwidth %" PRIu64 " between initiator=3D= %d and " > + "target=3D%d should be 1MB aligned.", node->bandw= idth, > + node->initiator, node->target); > + return; > + } > + > + hmat_lb->range_bitmap_bw |=3D node->bandwidth; > + > + first_bit =3D __builtin_ffs(hmat_lb->range_bitmap_bw); > + last_bit =3D __builtin_ctz(hmat_lb->range_bitmap_bw); > + if ((last_bit - first_bit) > UINT16_BITS) { > + error_setg(errp, "Bandwidth %" PRIu64 " between initiator=3D= %d and " > + "target=3D%d should not differ from previously en= tered " > + "values on more than %d.", node->bandwidth, > + node->initiator, node->target, UINT16_MAX - 1); > + return; > + } > + > + hmat_lb->base_bandwidth =3D UINT64_C(1) << (first_bit - 1); > + lb_data.rawdata =3D node->bandwidth; > + g_array_append_val(hmat_lb->bandwidth, lb_data); > + } > +} > + > void set_numa_options(MachineState *ms, NumaOptions *object, Error **err= p) > { > Error *err =3D NULL; > @@ -236,6 +350,19 @@ void set_numa_options(MachineState *ms, NumaOptions = *object, Error **errp) > machine_set_cpu_numa_node(ms, qapi_NumaCpuOptions_base(&object->= u.cpu), > &err); > break; > + case NUMA_OPTIONS_TYPE_HMAT_LB: > + if (!ms->numa_state->hmat_enabled) { > + error_setg(errp, "ACPI Heterogeneous Memory Attribute Table = " > + "(HMAT) is disabled, enable it with -machine hmat= =3Don " > + "before using any of hmat specific options."); > + return; > + } > + > + parse_numa_hmat_lb(ms->numa_state, &object->u.hmat_lb, &err); > + if (err) { > + goto end; > + } > + break; > default: > abort(); > } > diff --git a/include/sysemu/numa.h b/include/sysemu/numa.h > index 788cbec7a2..b45afcb29e 100644 > --- a/include/sysemu/numa.h > +++ b/include/sysemu/numa.h > @@ -14,6 +14,29 @@ struct CPUArchId; > #define NUMA_DISTANCE_MAX 254 > #define NUMA_DISTANCE_UNREACHABLE 255 > =20 > +/* the value of AcpiHmatLBInfo flags */ > +enum { > + HMAT_LB_MEM_MEMORY =3D 0, > + HMAT_LB_MEM_CACHE_1ST_LEVEL =3D 1, > + HMAT_LB_MEM_CACHE_2ND_LEVEL =3D 2, > + HMAT_LB_MEM_CACHE_3RD_LEVEL =3D 3, > +}; > + > +/* the value of AcpiHmatLBInfo data type */ > +enum { > + HMAT_LB_DATA_ACCESS_LATENCY =3D 0, > + HMAT_LB_DATA_READ_LATENCY =3D 1, > + HMAT_LB_DATA_WRITE_LATENCY =3D 2, > + HMAT_LB_DATA_ACCESS_BANDWIDTH =3D 3, > + HMAT_LB_DATA_READ_BANDWIDTH =3D 4, > + HMAT_LB_DATA_WRITE_BANDWIDTH =3D 5, > +}; > + > +#define UINT16_BITS 16 > + > +#define HMAT_LB_LEVELS (HMAT_LB_MEM_CACHE_3RD_LEVEL + 1) > +#define HMAT_LB_TYPES (HMAT_LB_DATA_WRITE_BANDWIDTH + 1) > + > struct NodeInfo { > uint64_t node_mem; > struct HostMemoryBackend *node_memdev; > @@ -28,6 +51,46 @@ struct NumaNodeMem { > uint64_t node_plugged_mem; > }; > =20 > +struct HMAT_LB_Data { > + uint8_t initiator; > + uint8_t target; > + uint64_t rawdata; > +}; > +typedef struct HMAT_LB_Data HMAT_LB_Data; > + > +struct HMAT_LB_Info { > + /* Indicates it's memory or the specified level memory side cache. *= / > + uint8_t hierarchy; > + > + /* Present the type of data, access/read/write latency or bandwidth.= */ > + uint8_t data_type; > + > + /* The left range of latency for calculating common latency base */ > + uint64_t range_left_la; > + > + /* The range bitmap of bandwidth for calculating common bandwidth ba= se */ > + uint64_t range_bitmap_bw; > + > + /* The common base unit for latencies */ > + uint64_t base_latency; > + > + /* The common base unit for bandwidths */ > + uint64_t base_bandwidth; > + > + /* Array to store the compressed latencies */ > + uint16_t *entry_latency; > + > + /* Array to store the compressed latencies */ > + uint16_t *entry_bandwidth; > + > + /* Array to store the latencies */ > + GArray *latency; > + > + /* Array to store the bandwidthes */ > + GArray *bandwidth; > +}; > +typedef struct HMAT_LB_Info HMAT_LB_Info; > + > struct NumaState { > /* Number of NUMA nodes */ > int num_nodes; > @@ -40,11 +103,16 @@ struct NumaState { > =20 > /* NUMA nodes information */ > NodeInfo nodes[MAX_NODES]; > + > + /* NUMA nodes HMAT Locality Latency and Bandwidth Information */ > + HMAT_LB_Info *hmat_lb[HMAT_LB_LEVELS][HMAT_LB_TYPES]; > }; > typedef struct NumaState NumaState; > =20 > void set_numa_options(MachineState *ms, NumaOptions *object, Error **err= p); > void parse_numa_opts(MachineState *ms); > +void parse_numa_hmat_lb(NumaState *numa_state, NumaHmatLBOptions *node, > + Error **errp); > void numa_complete_configuration(MachineState *ms); > void query_numa_node_mem(NumaNodeMem node_mem[], MachineState *ms); > extern QemuOptsList qemu_numa_opts; > diff --git a/qapi/machine.json b/qapi/machine.json > index f1b07b3486..9ca008810b 100644 > --- a/qapi/machine.json > +++ b/qapi/machine.json > @@ -426,10 +426,12 @@ > # > # @cpu: property based CPU(s) to node mapping (Since: 2.10) > # > +# @hmat-lb: memory latency and bandwidth information (Since: 4.2) > +# > # Since: 2.1 > ## > { 'enum': 'NumaOptionsType', > - 'data': [ 'node', 'dist', 'cpu' ] } > + 'data': [ 'node', 'dist', 'cpu', 'hmat-lb' ] } > =20 > ## > # @NumaOptions: > @@ -444,7 +446,8 @@ > 'data': { > 'node': 'NumaNodeOptions', > 'dist': 'NumaDistOptions', > - 'cpu': 'NumaCpuOptions' }} > + 'cpu': 'NumaCpuOptions', > + 'hmat-lb': 'NumaHmatLBOptions' }} > =20 > ## > # @NumaNodeOptions: > @@ -557,6 +560,94 @@ > 'base': 'CpuInstanceProperties', > 'data' : {} } > =20 > +## > +# @HmatLBMemoryHierarchy: > +# > +# The memory hierarchy in the System Locality Latency > +# and Bandwidth Information Structure of HMAT (Heterogeneous > +# Memory Attribute Table) > +# > +# For more information of @HmatLBMemoryHierarchy see > +# the chapter 5.2.27.4: Table 5-142: Field "Flags" of ACPI 6.3 spec. > +# > +# @memory: the structure represents the memory performance > +# > +# @first-level: first level memory of memory side cached memory > +# > +# @second-level: second level memory of memory side cached memory > +# > +# @third-level: third level memory of memory side cached memory > +# > +# Since: 4.2 > +## > +{ 'enum': 'HmatLBMemoryHierarchy', > + 'data': [ 'memory', 'first-level', 'second-level', 'third-level' ] } > + > +## > +# @HmatLBDataType: > +# > +# Data type in the System Locality Latency > +# and Bandwidth Information Structure of HMAT (Heterogeneous > +# Memory Attribute Table) > +# > +# For more information of @HmatLBDataType see > +# the chapter 5.2.27.4: Table 5-142: Field "Data Type" of ACPI 6.3 spec= . > +# > +# @access-latency: access latency (nanoseconds) > +# > +# @read-latency: read latency (nanoseconds) > +# > +# @write-latency: write latency (nanoseconds) > +# > +# @access-bandwidth: access bandwidth (MB/s) > +# > +# @read-bandwidth: read bandwidth (MB/s) > +# > +# @write-bandwidth: write bandwidth (MB/s) > +# > +# Since: 4.2 > +## > +{ 'enum': 'HmatLBDataType', > + 'data': [ 'access-latency', 'read-latency', 'write-latency', > + 'access-bandwidth', 'read-bandwidth', 'write-bandwidth' ] } > + > +## > +# @NumaHmatLBOptions: > +# > +# Set the system locality latency and bandwidth information > +# between Initiator and Target proximity Domains. > +# > +# For more information of @NumaHmatLBOptions see > +# the chapter 5.2.27.4: Table 5-142 of ACPI 6.3 spec. > +# > +# @initiator: the Initiator Proximity Domain. > +# > +# @target: the Target Proximity Domain. > +# > +# @hierarchy: the Memory Hierarchy. Indicates the performance > +# of memory or side cache. > +# > +# @data-type: presents the type of data, access/read/write > +# latency or hit latency. > +# > +# @latency: the value of latency from @initiator to @target proximity do= main, > +# the latency units are "ps(picosecond)", "ns(nanosecond)" or > +# "us(microsecond)". > +# > +# @bandwidth: the value of bandwidth between @initiator and @target prox= imity > +# domain, the bandwidth units are "MB(/s)","GB(/s)" or "TB(/= s)". > +# > +# Since: 4.2 > +## > +{ 'struct': 'NumaHmatLBOptions', > + 'data': { > + 'initiator': 'uint16', > + 'target': 'uint16', > + 'hierarchy': 'HmatLBMemoryHierarchy', > + 'data-type': 'HmatLBDataType', > + '*latency': 'time', > + '*bandwidth': 'size' }} > + > ## > # @HostMemPolicy: > # > diff --git a/qemu-options.hx b/qemu-options.hx > index 1f96399521..de97939f9a 100644 > --- a/qemu-options.hx > +++ b/qemu-options.hx > @@ -168,16 +168,19 @@ DEF("numa", HAS_ARG, QEMU_OPTION_numa, > "-numa node[,mem=3Dsize][,cpus=3Dfirstcpu[-lastcpu]][,nodeid=3Dnode]= [,initiator=3Dnode]\n" > "-numa node[,memdev=3Did][,cpus=3Dfirstcpu[-lastcpu]][,nodeid=3Dnode= ][,initiator=3Dnode]\n" > "-numa dist,src=3Dsource,dst=3Ddestination,val=3Ddistance\n" > - "-numa cpu,node-id=3Dnode[,socket-id=3Dx][,core-id=3Dy][,thread-id= =3Dz]\n", > + "-numa cpu,node-id=3Dnode[,socket-id=3Dx][,core-id=3Dy][,thread-id= =3Dz]\n" > + "-numa hmat-lb,initiator=3Dnode,target=3Dnode,hierarchy=3Dmemory|fir= st-level|second-level|third-level,data-type=3Daccess-latency|read-latency|w= rite-latency[,latency=3Dlat][,bandwidth=3Dbw]\n", > QEMU_ARCH_ALL) > STEXI > @item -numa node[,mem=3D@var{size}][,cpus=3D@var{firstcpu}[-@var{lastcpu= }]][,nodeid=3D@var{node}][,initiator=3D@var{initiator}] > @itemx -numa node[,memdev=3D@var{id}][,cpus=3D@var{firstcpu}[-@var{lastc= pu}]][,nodeid=3D@var{node}][,initiator=3D@var{initiator}] > @itemx -numa dist,src=3D@var{source},dst=3D@var{destination},val=3D@var{= distance} > @itemx -numa cpu,node-id=3D@var{node}[,socket-id=3D@var{x}][,core-id=3D@= var{y}][,thread-id=3D@var{z}] > +@itemx -numa hmat-lb,initiator=3D@var{node},target=3D@var{node},hierarch= y=3D@var{str},data-type=3D@var{str}[,latency=3D@var{lat}][,bandwidth=3D@var= {bw}] > @findex -numa > Define a NUMA node and assign RAM and VCPUs to it. > Set the NUMA distance from a source node to a destination node. > +Set the ACPI Heterogeneous Memory Attributes for the given nodes. > =20 > Legacy VCPU assignment uses @samp{cpus} option where > @var{firstcpu} and @var{lastcpu} are CPU indexes. Each > @@ -256,6 +259,50 @@ specified resources, it just assigns existing resour= ces to NUMA > nodes. This means that one still has to use the @option{-m}, > @option{-smp} options to allocate RAM and VCPUs respectively. > =20 > +Use @samp{hmat-lb} to set System Locality Latency and Bandwidth Informat= ion > +between initiator and target NUMA nodes in ACPI Heterogeneous Attribute = Memory Table (HMAT). > +Initiator NUMA node can create memory requests, usually including one or= more processors. > +Target NUMA node contains addressable memory. > + > +In @samp{hmat-lb} option, @var{node} are NUMA node IDs. @var{str} of 'hi= erarchy' > +is the memory hierarchy of the target NUMA node: if @var{str} is 'memory= ', the structure > +represents the memory performance; if @var{str} is 'first-level|second-l= evel|third-level', > +this structure represents aggregated performance of memory side caches f= or each domain. > +@var{str} of 'data-type' is type of data represented by this structure i= nstance: > +if 'hierarchy' is 'memory', 'data-type' is 'access|read|write' latency(n= anoseconds) > +or 'access|read|write' bandwidth(MB/s) of the target memory; if 'hierarc= hy' is > +'first-level|second-level|third-level', 'data-type' is 'access|read|writ= e' hit latency > +or 'access|read|write' hit bandwidth of the target memory side cache. > + > +@var{lat} of 'latency' is latency value, the possible value and units ar= e > +NUM[ps|ns|us] (picosecond|nanosecond|microsecond), the recommended unit = is 'ns'. @var{bw} > +is bandwidth value, the possible value and units are NUM[M|G|T], mean th= at > +the bandwidth value are NUM MB/s, GB/s or TB/s. Note that max NUM is 655= 34, > +if NUM is 0, means the corresponding latency or bandwidth information is= not provided. > +And if input numbers without any unit, the latency unit will be 'ps' and= the bandwidth > +will be MB/s. > + > +For example, the following option assigns NUMA node 0 and 1. Node 0 has = 2 cpus and > +a ram, node 1 has only a ram. The processors in node 0 access memory in = node > +0 with access-latency 5 nanoseconds, access-bandwidth is 200 MB/s; > +The processors in NUMA node 0 access memory in NUMA node 1 with access-l= atency 10 > +nanoseconds, access-bandwidth is 100 MB/s. > +@example > +-machine hmat=3Don \ > +-m 2G \ > +-object memory-backend-ram,size=3D1G,id=3Dm0 \ > +-object memory-backend-ram,size=3D1G,id=3Dm1 \ > +-smp 2 \ > +-numa node,nodeid=3D0,memdev=3Dm0 \ > +-numa node,nodeid=3D1,memdev=3Dm1,initiator=3D0 \ > +-numa cpu,node-id=3D0,socket-id=3D0 \ > +-numa cpu,node-id=3D0,socket-id=3D1 \ > +-numa hmat-lb,initiator=3D0,target=3D0,hierarchy=3Dmemory,data-type=3Dac= cess-latency,latency=3D5ns \ > +-numa hmat-lb,initiator=3D0,target=3D0,hierarchy=3Dmemory,data-type=3Dac= cess-bandwidth,bandwidth=3D200M \ > +-numa hmat-lb,initiator=3D0,target=3D1,hierarchy=3Dmemory,data-type=3Dac= cess-latency,latency=3D10ns \ > +-numa hmat-lb,initiator=3D0,target=3D1,hierarchy=3Dmemory,data-type=3Dac= cess-bandwidth,bandwidth=3D100M > +@end example > + > ETEXI > =20 > DEF("add-fd", HAS_ARG, QEMU_OPTION_add_fd,