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GET /api/patches/53183/?format=api
HTTP 200 OK
Allow: GET, PUT, PATCH, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

{
    "id": 53183,
    "url": "http://patches.dpdk.org/api/patches/53183/?format=api",
    "web_url": "http://patches.dpdk.org/project/dpdk/patch/20190501035419.33524-4-honnappa.nagarahalli@arm.com/",
    "project": {
        "id": 1,
        "url": "http://patches.dpdk.org/api/projects/1/?format=api",
        "name": "DPDK",
        "link_name": "dpdk",
        "list_id": "dev.dpdk.org",
        "list_email": "dev@dpdk.org",
        "web_url": "http://core.dpdk.org",
        "scm_url": "git://dpdk.org/dpdk",
        "webscm_url": "http://git.dpdk.org/dpdk",
        "list_archive_url": "https://inbox.dpdk.org/dev",
        "list_archive_url_format": "https://inbox.dpdk.org/dev/{}",
        "commit_url_format": ""
    },
    "msgid": "<20190501035419.33524-4-honnappa.nagarahalli@arm.com>",
    "list_archive_url": "https://inbox.dpdk.org/dev/20190501035419.33524-4-honnappa.nagarahalli@arm.com",
    "date": "2019-05-01T03:54:18",
    "name": "[v9,3/4] doc/rcu: add lib_rcu documentation",
    "commit_ref": null,
    "pull_url": null,
    "state": "accepted",
    "archived": true,
    "hash": "f1b18ddf929a564336aee7f45d60ee34c9373d3d",
    "submitter": {
        "id": 1045,
        "url": "http://patches.dpdk.org/api/people/1045/?format=api",
        "name": "Honnappa Nagarahalli",
        "email": "honnappa.nagarahalli@arm.com"
    },
    "delegate": null,
    "mbox": "http://patches.dpdk.org/project/dpdk/patch/20190501035419.33524-4-honnappa.nagarahalli@arm.com/mbox/",
    "series": [
        {
            "id": 4524,
            "url": "http://patches.dpdk.org/api/series/4524/?format=api",
            "web_url": "http://patches.dpdk.org/project/dpdk/list/?series=4524",
            "date": "2019-05-01T03:54:15",
            "name": "lib/rcu: add RCU library supporting QSBR mechanism",
            "version": 9,
            "mbox": "http://patches.dpdk.org/series/4524/mbox/"
        }
    ],
    "comments": "http://patches.dpdk.org/api/patches/53183/comments/",
    "check": "success",
    "checks": "http://patches.dpdk.org/api/patches/53183/checks/",
    "tags": {},
    "related": [],
    "headers": {
        "X-BeenThere": "dev@dpdk.org",
        "Return-Path": "<dev-bounces@dpdk.org>",
        "Sender": "\"dev\" <dev-bounces@dpdk.org>",
        "From": "Honnappa Nagarahalli <honnappa.nagarahalli@arm.com>",
        "Cc": "honnappa.nagarahalli@arm.com, gavin.hu@arm.com, dharmik.thakkar@arm.com, \n\tmalvika.gupta@arm.com",
        "To": "konstantin.ananyev@intel.com, stephen@networkplumber.org,\n\tpaulmck@linux.ibm.com, marko.kovacevic@intel.com, dev@dpdk.org",
        "Delivered-To": "patchwork@dpdk.org",
        "List-Archive": "<http://mails.dpdk.org/archives/dev/>",
        "References": "<20181122033055.3431-1-honnappa.nagarahalli@arm.com>\n\t<20190501035419.33524-1-honnappa.nagarahalli@arm.com>",
        "In-Reply-To": "<20190501035419.33524-1-honnappa.nagarahalli@arm.com>",
        "List-Subscribe": "<https://mails.dpdk.org/listinfo/dev>,\n\t<mailto:dev-request@dpdk.org?subject=subscribe>",
        "List-Id": "DPDK patches and discussions <dev.dpdk.org>",
        "X-Mailer": "git-send-email 2.17.1",
        "List-Unsubscribe": "<https://mails.dpdk.org/options/dev>,\n\t<mailto:dev-request@dpdk.org?subject=unsubscribe>",
        "Received": [
            "from [92.243.14.124] (localhost [127.0.0.1])\n\tby dpdk.org (Postfix) with ESMTP id A86595F19;\n\tWed,  1 May 2019 05:54:40 +0200 (CEST)",
            "from foss.arm.com (foss.arm.com [217.140.101.70])\n\tby dpdk.org (Postfix) with ESMTP id CD3C05B12\n\tfor <dev@dpdk.org>; Wed,  1 May 2019 05:54:34 +0200 (CEST)",
            "from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249])\n\tby usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 4456EA78;\n\tTue, 30 Apr 2019 20:54:34 -0700 (PDT)",
            "from qc2400f-1.austin.arm.com (qc2400f-1.austin.arm.com\n\t[10.118.12.65])\n\tby usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id\n\tBDC5F3F719; Tue, 30 Apr 2019 20:54:33 -0700 (PDT)"
        ],
        "X-Original-To": "patchwork@dpdk.org",
        "X-Mailman-Version": "2.1.15",
        "List-Help": "<mailto:dev-request@dpdk.org?subject=help>",
        "Errors-To": "dev-bounces@dpdk.org",
        "Subject": "[dpdk-dev] [PATCH v9 3/4] doc/rcu: add lib_rcu documentation",
        "Date": "Tue, 30 Apr 2019 22:54:18 -0500",
        "Message-Id": "<20190501035419.33524-4-honnappa.nagarahalli@arm.com>",
        "Precedence": "list",
        "List-Post": "<mailto:dev@dpdk.org>"
    },
    "content": "Add lib_rcu QSBR API and programmer guide documentation.\n\nSigned-off-by: Honnappa Nagarahalli <honnappa.nagarahalli@arm.com>\nReviewed-by: Marko Kovacevic <marko.kovacevic@intel.com>\n---\n doc/api/doxy-api-index.md                     |   3 +-\n doc/api/doxy-api.conf.in                      |   1 +\n .../prog_guide/img/rcu_general_info.svg       | 509 ++++++++++++++++++\n doc/guides/prog_guide/index.rst               |   1 +\n doc/guides/prog_guide/rcu_lib.rst             | 185 +++++++\n 5 files changed, 698 insertions(+), 1 deletion(-)\n create mode 100644 doc/guides/prog_guide/img/rcu_general_info.svg\n create mode 100644 doc/guides/prog_guide/rcu_lib.rst",
    "diff": "diff --git a/doc/api/doxy-api-index.md b/doc/api/doxy-api-index.md\nindex de1e215dd..8f0e84de6 100644\n--- a/doc/api/doxy-api-index.md\n+++ b/doc/api/doxy-api-index.md\n@@ -54,7 +54,8 @@ The public API headers are grouped by topics:\n   [memzone]            (@ref rte_memzone.h),\n   [mempool]            (@ref rte_mempool.h),\n   [malloc]             (@ref rte_malloc.h),\n-  [memcpy]             (@ref rte_memcpy.h)\n+  [memcpy]             (@ref rte_memcpy.h),\n+  [rcu]                (@ref rte_rcu_qsbr.h)\n \n - **timers**:\n   [cycles]             (@ref rte_cycles.h),\ndiff --git a/doc/api/doxy-api.conf.in b/doc/api/doxy-api.conf.in\nindex 7722fc3e9..b9896cb63 100644\n--- a/doc/api/doxy-api.conf.in\n+++ b/doc/api/doxy-api.conf.in\n@@ -51,6 +51,7 @@ INPUT                   = @TOPDIR@/doc/api/doxy-api-index.md \\\n                           @TOPDIR@/lib/librte_port \\\n                           @TOPDIR@/lib/librte_power \\\n                           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transform=\"translate(190.02,-464.886)\">\n+\t\t\t<title>Sheet.71</title>\n+\t\t\t<path d=\"M0 1151.91 C0 1148.19 3.88 1145.17 8.66 1145.17 L43.29 1145.17 C48.13 1145.17 51.95 1148.19 51.95 1151.91 L51.95\n+\t\t\t\t\t\t 1181.26 C51.95 1185.03 48.13 1188 43.29 1188 L8.66 1188 C3.88 1188 0 1185.03 0 1181.26 L0 1151.91 Z\"\n+\t\t\t\t\tclass=\"st1\"/>\n+\t\t</g>\n+\t\t<g id=\"shape72-191\" v:mID=\"72\" v:groupContext=\"shape\" transform=\"translate(259.003,-466.895)\">\n+\t\t\t<title>Sheet.72</title>\n+\t\t\t<desc>Reader thread is not accessing any shared data structure. i.e...</desc>\n+\t\t\t<v:textBlock v:margins=\"rect(0,0,0,0)\"/>\n+\t\t\t<v:textRect cx=\"344.967\" cy=\"1169.45\" width=\"689.94\" height=\"37.1049\"/>\n+\t\t\t<path d=\"M689.93 1150.9 L0 1150.9 L0 1188 L689.93 1188 L689.93 1150.9\" class=\"st3\"/>\n+\t\t\t<text x=\"0\" y=\"1162.25\" class=\"st14\" v:langID=\"1033\"><v:paragraph/><v:tabList/>Reader thread is not accessing any shared data 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transform=\"translate(259.003,-388.777)\">\n+\t\t\t<title>Sheet.74</title>\n+\t\t\t<desc>Reader thread is accessing the shared data structure Dx. i.e....</desc>\n+\t\t\t<v:textBlock v:margins=\"rect(0,0,0,0)\"/>\n+\t\t\t<v:textRect cx=\"344.967\" cy=\"1169.45\" width=\"689.94\" height=\"37.1049\"/>\n+\t\t\t<path d=\"M689.93 1150.9 L0 1150.9 L0 1188 L689.93 1188 L689.93 1150.9\" class=\"st3\"/>\n+\t\t\t<text x=\"0\" y=\"1162.25\" class=\"st14\" v:langID=\"1033\"><v:paragraph/><v:tabList/>Reader thread is accessing the shared data structure Dx.<v:newlineChar/><tspan\n+\t\t\t\t\t\tx=\"0\" dy=\"1.2em\" class=\"st9\">i.e. critical section.</tspan></text>\t\t</g>\n+\t\t<g id=\"shape75-204\" v:mID=\"75\" v:groupContext=\"shape\" transform=\"translate(289.017,-301.151)\">\n+\t\t\t<title>Sheet.75</title>\n+\t\t\t<desc>Point in time when the reference to the entry is removed usin...</desc>\n+\t\t\t<v:textBlock v:margins=\"rect(0,0,0,0)\"/>\n+\t\t\t<v:textRect cx=\"332.491\" cy=\"1160.47\" 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v:groupContext=\"shape\" transform=\"translate(288,-239.327)\">\n+\t\t\t<title>Sheet.77</title>\n+\t\t\t<desc>Point in time when the writer can free the deleted entry.</desc>\n+\t\t\t<v:textBlock v:margins=\"rect(0,0,0,0)\"/>\n+\t\t\t<v:textRect cx=\"328.5\" cy=\"1167.81\" width=\"657\" height=\"40.3845\"/>\n+\t\t\t<path d=\"M657 1147.62 L0 1147.62 L0 1188 L657 1188 L657 1147.62\" class=\"st3\"/>\n+\t\t\t<text x=\"0\" y=\"1175.01\" class=\"st14\" v:langID=\"1033\"><v:paragraph/><v:tabList/>Point in time when the writer can free the deleted entry.</text>\t\t</g>\n+\t\t<g id=\"shape78-217\" v:mID=\"78\" v:groupContext=\"shape\" transform=\"translate(177.543,-240.744)\">\n+\t\t\t<title>Sheet.78</title>\n+\t\t\t<desc>Free</desc>\n+\t\t\t<v:textBlock v:margins=\"rect(0,0,0,0)\"/>\n+\t\t\t<v:textRect cx=\"34.3786\" cy=\"1166.58\" width=\"68.76\" height=\"42.8314\"/>\n+\t\t\t<path d=\"M68.76 1145.17 L0 1145.17 L0 1188 L68.76 1188 L68.76 1145.17\" class=\"st3\"/>\n+\t\t\t<text x=\"11.25\" 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Period</desc>\n+\t\t\t<v:textBlock v:margins=\"rect(0,0,0,0)\"/>\n+\t\t\t<v:textRect cx=\"39.5985\" cy=\"1166.58\" width=\"79.2\" height=\"42.8314\"/>\n+\t\t\t<path d=\"M79.2 1145.17 L0 1145.17 L0 1188 L79.2 1188 L79.2 1145.17\" class=\"st3\"/>\n+\t\t\t<text x=\"0\" y=\"1158.96\" class=\"st11\" v:langID=\"1033\"><v:paragraph/><v:tabList/>Grace <tspan x=\"0\" dy=\"1.2em\"\n+\t\t\t\t\t\tclass=\"st9\">Period</tspan></text>\t\t</g>\n+\t\t<g id=\"shape83-231\" v:mID=\"83\" v:groupContext=\"shape\" transform=\"translate(572.146,-1080.07)\">\n+\t\t\t<title>Sheet.83</title>\n+\t\t\t<path d=\"M9.3 1188 L9.66 1188 L132.49 1188\" class=\"st16\"/>\n+\t\t</g>\n+\t\t<g id=\"shape84-240\" v:mID=\"84\" v:groupContext=\"shape\" transform=\"translate(599.196,-1042.14)\">\n+\t\t\t<title>Sheet.84</title>\n+\t\t\t<path d=\"M7.41 1188 L7.77 1188 L104.28 1188\" class=\"st18\"/>\n+\t\t</g>\n+\t\t<g id=\"shape85-249\" v:mID=\"85\" v:groupContext=\"shape\" 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class=\"st3\"/>\n+\t\t\t<text x=\"2.39\" y=\"1163.15\" class=\"st8\" v:langID=\"1033\"><v:paragraph v:horizAlign=\"2\"/><v:tabList/>Remove reference <tspan\n+\t\t\t\t\t\tx=\"104.08\" dy=\"1.2em\" class=\"st9\">to entry2</tspan></text>\t\t</g>\n+\t</g>\n+</svg>\ndiff --git a/doc/guides/prog_guide/index.rst b/doc/guides/prog_guide/index.rst\nindex 95f5e7964..17df2c563 100644\n--- a/doc/guides/prog_guide/index.rst\n+++ b/doc/guides/prog_guide/index.rst\n@@ -56,6 +56,7 @@ Programmer's Guide\n     metrics_lib\n     bpf_lib\n     ipsec_lib\n+    rcu_lib\n     source_org\n     dev_kit_build_system\n     dev_kit_root_make_help\ndiff --git a/doc/guides/prog_guide/rcu_lib.rst b/doc/guides/prog_guide/rcu_lib.rst\nnew file mode 100644\nindex 000000000..55d44e15d\n--- /dev/null\n+++ b/doc/guides/prog_guide/rcu_lib.rst\n@@ -0,0 +1,185 @@\n+..  SPDX-License-Identifier: BSD-3-Clause\n+    Copyright(c) 2019 Arm Limited.\n+\n+.. _RCU_Library:\n+\n+RCU Library\n+============\n+\n+Lock-less data structures provide scalability and determinism.\n+They enable use cases where locking may not be allowed\n+(for ex: real-time applications).\n+\n+In the following paras, the term 'memory' refers to memory allocated\n+by typical APIs like malloc or anything that is representative of\n+memory, for ex: an index of a free element array.\n+\n+Since these data structures are lock less, the writers and readers\n+are accessing the data structures concurrently. Hence, while removing\n+an element from a data structure, the writers cannot return the memory\n+to the allocator, without knowing that the readers are not\n+referencing that element/memory anymore. Hence, it is required to\n+separate the operation of removing an element into 2 steps:\n+\n+Delete: in this step, the writer removes the reference to the element from\n+the data structure but does not return the associated memory to the\n+allocator. This will ensure that new readers will not get a reference to\n+the removed element. Removing the reference is an atomic operation.\n+\n+Free(Reclaim): in this step, the writer returns the memory to the\n+memory allocator, only after knowing that all the readers have stopped\n+referencing the deleted element.\n+\n+This library helps the writer determine when it is safe to free the\n+memory.\n+\n+This library makes use of thread Quiescent State (QS).\n+\n+What is Quiescent State\n+-----------------------\n+Quiescent State can be defined as 'any point in the thread execution where the\n+thread does not hold a reference to shared memory'. It is up to the application\n+to determine its quiescent state.\n+\n+Let us consider the following diagram:\n+\n+.. figure:: img/rcu_general_info.*\n+\n+\n+As shown, reader thread 1 accesses data structures D1 and D2. When it is\n+accessing D1, if the writer has to remove an element from D1, the\n+writer cannot free the memory associated with that element immediately.\n+The writer can return the memory to the allocator only after the reader\n+stops referencing D1. In other words, reader thread RT1 has to enter\n+a quiescent state.\n+\n+Similarly, since reader thread 2 is also accessing D1, writer has to\n+wait till thread 2 enters quiescent state as well.\n+\n+However, the writer does not need to wait for reader thread 3 to enter\n+quiescent state. Reader thread 3 was not accessing D1 when the delete\n+operation happened. So, reader thread 1 will not have a reference to the\n+deleted entry.\n+\n+It can be noted that, the critical sections for D2 is a quiescent state\n+for D1. i.e. for a given data structure Dx, any point in the thread execution\n+that does not reference Dx is a quiescent state.\n+\n+Since memory is not freed immediately, there might be a need for\n+provisioning of additional memory, depending on the application requirements.\n+\n+Factors affecting RCU mechanism\n+---------------------------------\n+\n+It is important to make sure that this library keeps the overhead of\n+identifying the end of grace period and subsequent freeing of memory,\n+to a minimum. The following paras explain how grace period and critical\n+section affect this overhead.\n+\n+The writer has to poll the readers to identify the end of grace period.\n+Polling introduces memory accesses and wastes CPU cycles. The memory\n+is not available for reuse during grace period. Longer grace periods\n+exasperate these conditions.\n+\n+The length of the critical section and the number of reader threads\n+is proportional to the duration of the grace period. Keeping the critical\n+sections smaller will keep the grace period smaller. However, keeping the\n+critical sections smaller requires additional CPU cycles (due to additional\n+reporting) in the readers.\n+\n+Hence, we need the characteristics of small grace period and large critical\n+section. This library addresses this by allowing the writer to do\n+other work without having to block till the readers report their quiescent\n+state.\n+\n+RCU in DPDK\n+-----------\n+\n+For DPDK applications, the start and end of while(1) loop (where no\n+references to shared data structures are kept) act as perfect quiescent\n+states. This will combine all the shared data structure accesses into a\n+single, large critical section which helps keep the overhead on the\n+reader side to a minimum.\n+\n+DPDK supports pipeline model of packet processing and service cores.\n+In these use cases, a given data structure may not be used by all the\n+workers in the application. The writer does not have to wait for all\n+the workers to report their quiescent state. To provide the required\n+flexibility, this library has a concept of QS variable. The application\n+can create one QS variable per data structure to help it track the\n+end of grace period for each data structure. This helps keep the grace\n+period to a minimum.\n+\n+How to use this library\n+-----------------------\n+\n+The application must allocate memory and initialize a QS variable.\n+\n+Application can call ``rte_rcu_qsbr_get_memsize`` to calculate the size\n+of memory to allocate. This API takes maximum number of reader threads,\n+using this variable, as a parameter. Currently, a maximum of 1024 threads\n+are supported.\n+\n+Further, the application can initialize a QS variable using the API\n+``rte_rcu_qsbr_init``.\n+\n+Each reader thread is assumed to have a unique thread ID. Currently, the\n+management of the thread ID (for ex: allocation/free) is left to the\n+application. The thread ID should be in the range of 0 to\n+maximum number of threads provided while creating the QS variable.\n+The application could also use lcore_id as the thread ID where applicable.\n+\n+``rte_rcu_qsbr_thread_register`` API will register a reader thread\n+to report its quiescent state. This can be called from a reader thread.\n+A control plane thread can also call this on behalf of a reader thread.\n+The reader thread must call ``rte_rcu_qsbr_thread_online`` API to start\n+reporting its quiescent state.\n+\n+Some of the use cases might require the reader threads to make\n+blocking API calls (for ex: while using eventdev APIs). The writer thread\n+should not wait for such reader threads to enter quiescent state.\n+The reader thread must call ``rte_rcu_qsbr_thread_offline`` API, before calling\n+blocking APIs. It can call ``rte_rcu_qsbr_thread_online`` API once the blocking\n+API call returns.\n+\n+The writer thread can trigger the reader threads to report their quiescent\n+state by calling the API ``rte_rcu_qsbr_start``. It is possible for multiple\n+writer threads to query the quiescent state status simultaneously. Hence,\n+``rte_rcu_qsbr_start`` returns a token to each caller.\n+\n+The writer thread must call ``rte_rcu_qsbr_check`` API with the token to\n+get the current quiescent state status. Option to block till all the reader\n+threads enter the quiescent state is provided. If this API indicates that\n+all the reader threads have entered the quiescent state, the application\n+can free the deleted entry.\n+\n+The APIs ``rte_rcu_qsbr_start`` and ``rte_rcu_qsbr_check`` are lock free.\n+Hence, they can be called concurrently from multiple writers even while\n+running as worker threads.\n+\n+The separation of triggering the reporting from querying the status provides\n+the writer threads flexibility to do useful work instead of blocking for the\n+reader threads to enter the quiescent state or go offline. This reduces the\n+memory accesses due to continuous polling for the status.\n+\n+``rte_rcu_qsbr_synchronize`` API combines the functionality of\n+``rte_rcu_qsbr_start`` and blocking ``rte_rcu_qsbr_check`` into a single API.\n+This API triggers the reader threads to report their quiescent state and\n+polls till all the readers enter the quiescent state or go offline. This\n+API does not allow the writer to do useful work while waiting and\n+introduces additional memory accesses due to continuous polling.\n+\n+The reader thread must call ``rte_rcu_qsbr_thread_offline`` and\n+``rte_rcu_qsbr_thread_unregister`` APIs to remove itself from reporting its\n+quiescent state. The ``rte_rcu_qsbr_check`` API will not wait for this reader\n+thread to report the quiescent state status anymore.\n+\n+The reader threads should call ``rte_rcu_qsbr_quiescent`` API to indicate that\n+they entered a quiescent state. This API checks if a writer has triggered a\n+quiescent state query and update the state accordingly.\n+\n+The ``rte_rcu_qsbr_lock`` and ``rte_rcu_qsbr_unlock`` are empty functions.\n+However, when ``CONFIG_RTE_LIBRTE_RCU_DEBUG`` is enabled, these APIs aid\n+in debugging issues. One can mark the access to shared data structures on the\n+reader side using these APIs. The ``rte_rcu_qsbr_quiescent`` will check if\n+all the locks are unlocked.\n",
    "prefixes": [
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}