get:
Show a patch.

patch:
Update a patch.

put:
Update a patch.

GET /api/patches/52140/?format=api
HTTP 200 OK
Allow: GET, PUT, PATCH, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

{
    "id": 52140,
    "url": "http://patches.dpdk.org/api/patches/52140/?format=api",
    "web_url": "http://patches.dpdk.org/project/dpdk/patch/1554274796-23258-3-git-send-email-phil.yang@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": "<1554274796-23258-3-git-send-email-phil.yang@arm.com>",
    "list_archive_url": "https://inbox.dpdk.org/dev/1554274796-23258-3-git-send-email-phil.yang@arm.com",
    "date": "2019-04-03T06:59:55",
    "name": "[v3,2/3] test/distributor: replace sync builtins with atomic builtins",
    "commit_ref": null,
    "pull_url": null,
    "state": "superseded",
    "archived": true,
    "hash": "8744bed80919ebb94b27b1aa73af84ee1fdb6263",
    "submitter": {
        "id": 833,
        "url": "http://patches.dpdk.org/api/people/833/?format=api",
        "name": "Phil Yang",
        "email": "phil.yang@arm.com"
    },
    "delegate": {
        "id": 1,
        "url": "http://patches.dpdk.org/api/users/1/?format=api",
        "username": "tmonjalo",
        "first_name": "Thomas",
        "last_name": "Monjalon",
        "email": "thomas@monjalon.net"
    },
    "mbox": "http://patches.dpdk.org/project/dpdk/patch/1554274796-23258-3-git-send-email-phil.yang@arm.com/mbox/",
    "series": [
        {
            "id": 4074,
            "url": "http://patches.dpdk.org/api/series/4074/?format=api",
            "web_url": "http://patches.dpdk.org/project/dpdk/list/?series=4074",
            "date": "2019-04-03T06:59:53",
            "name": "example and test cases optimizations",
            "version": 3,
            "mbox": "http://patches.dpdk.org/series/4074/mbox/"
        }
    ],
    "comments": "http://patches.dpdk.org/api/patches/52140/comments/",
    "check": "success",
    "checks": "http://patches.dpdk.org/api/patches/52140/checks/",
    "tags": {},
    "related": [],
    "headers": {
        "Return-Path": "<dev-bounces@dpdk.org>",
        "X-Original-To": "patchwork@dpdk.org",
        "Delivered-To": "patchwork@dpdk.org",
        "Received": [
            "from [92.243.14.124] (localhost [127.0.0.1])\n\tby dpdk.org (Postfix) with ESMTP id 1737A6CD8;\n\tWed,  3 Apr 2019 09:02:55 +0200 (CEST)",
            "from foss.arm.com (foss.arm.com [217.140.101.70])\n\tby dpdk.org (Postfix) with ESMTP id 075B45F36\n\tfor <dev@dpdk.org>; Wed,  3 Apr 2019 09:02:50 +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 77E0D80D;\n\tWed,  3 Apr 2019 00:02:49 -0700 (PDT)",
            "from phil-VirtualBox.shanghai.arm.com (unknown [10.169.109.179])\n\tby usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id\n\t0BB603F68F; Wed,  3 Apr 2019 00:02:47 -0700 (PDT)"
        ],
        "From": "Phil Yang <phil.yang@arm.com>",
        "To": "dev@dpdk.org,\n\tthomas@monjalon.net",
        "Cc": "david.hunt@intel.com, reshma.pattan@intel.com, gavin.hu@arm.com,\n\thonnappa.nagarahalli@arm.com, phil.yang@arm.com, nd@arm.com",
        "Date": "Wed,  3 Apr 2019 14:59:55 +0800",
        "Message-Id": "<1554274796-23258-3-git-send-email-phil.yang@arm.com>",
        "X-Mailer": "git-send-email 2.7.4",
        "In-Reply-To": "<1554274796-23258-1-git-send-email-phil.yang@arm.com>",
        "References": "<1546508946-12552-1-git-send-email-phil.yang@arm.com>\n\t<1554274796-23258-1-git-send-email-phil.yang@arm.com>",
        "Subject": "[dpdk-dev] [PATCH v3 2/3] test/distributor: replace sync builtins\n\twith atomic builtins",
        "X-BeenThere": "dev@dpdk.org",
        "X-Mailman-Version": "2.1.15",
        "Precedence": "list",
        "List-Id": "DPDK patches and discussions <dev.dpdk.org>",
        "List-Unsubscribe": "<https://mails.dpdk.org/options/dev>,\n\t<mailto:dev-request@dpdk.org?subject=unsubscribe>",
        "List-Archive": "<http://mails.dpdk.org/archives/dev/>",
        "List-Post": "<mailto:dev@dpdk.org>",
        "List-Help": "<mailto:dev-request@dpdk.org?subject=help>",
        "List-Subscribe": "<https://mails.dpdk.org/listinfo/dev>,\n\t<mailto:dev-request@dpdk.org?subject=subscribe>",
        "Errors-To": "dev-bounces@dpdk.org",
        "Sender": "\"dev\" <dev-bounces@dpdk.org>"
    },
    "content": "'__sync' built-in functions are deprecated, should use the '__atomic'\nbuilt-in instead. the sync built-in functions are full barriers, while\natomic built-in functions offer less restrictive one-way barriers,\nwhich help performance.\n\nHere is the example test result on TX2:\nsudo ./arm64-armv8a-linuxapp-gcc/app/test -l 112-139 \\\n-n 4 --socket-mem=1024,1024 -- -i\nRTE>>distributor_perf_autotest\n\n*** distributor_perf_autotest without this patch ***",
    "diff": "==== Cache line switch test ===\nTime for 33554432 iterations = 1519202730 ticks\nTicks per iteration = 45\n\n*** distributor_perf_autotest with this patch ***\n==== Cache line switch test ===\nTime for 33554432 iterations = 1251715496 ticks\nTicks per iteration = 37\n\nLess ticks needed for the cache line switch test. It got 17% of\nperformance improvement.\n\nSigned-off-by: Phil Yang <phil.yang@arm.com>\nReviewed-by: Gavin Hu <gavin.hu@arm.com>\nReviewed-by: Ruifeng Wang <ruifeng.wang@arm.com>\nReviewed-by: Joyce Kong <joyce.kong@arm.com>\nReviewed-by: Dharmik Thakkar <dharmik.thakkar@arm.com>\n---\n app/test/test_distributor.c      | 7 ++++---\n app/test/test_distributor_perf.c | 2 +-\n 2 files changed, 5 insertions(+), 4 deletions(-)\n\ndiff --git a/app/test/test_distributor.c b/app/test/test_distributor.c\nindex 98919ec..0364637 100644\n--- a/app/test/test_distributor.c\n+++ b/app/test/test_distributor.c\n@@ -62,7 +62,7 @@ handle_work(void *arg)\n \tstruct worker_params *wp = arg;\n \tstruct rte_distributor *db = wp->dist;\n \tunsigned int count = 0, num = 0;\n-\tunsigned int id = __sync_fetch_and_add(&worker_idx, 1);\n+\tunsigned int id = __atomic_fetch_add(&worker_idx, 1, __ATOMIC_RELAXED);\n \tint i;\n \n \tfor (i = 0; i < 8; i++)\n@@ -270,7 +270,7 @@ handle_work_with_free_mbufs(void *arg)\n \tunsigned int count = 0;\n \tunsigned int i;\n \tunsigned int num = 0;\n-\tunsigned int id = __sync_fetch_and_add(&worker_idx, 1);\n+\tunsigned int id = __atomic_fetch_add(&worker_idx, 1, __ATOMIC_RELAXED);\n \n \tfor (i = 0; i < 8; i++)\n \t\tbuf[i] = NULL;\n@@ -343,7 +343,8 @@ handle_work_for_shutdown_test(void *arg)\n \tunsigned int total = 0;\n \tunsigned int i;\n \tunsigned int returned = 0;\n-\tconst unsigned int id = __sync_fetch_and_add(&worker_idx, 1);\n+\tconst unsigned int id = __atomic_fetch_add(&worker_idx, 1,\n+\t\t\t__ATOMIC_RELAXED);\n \n \tnum = rte_distributor_get_pkt(d, id, buf, buf, num);\n \ndiff --git a/app/test/test_distributor_perf.c b/app/test/test_distributor_perf.c\nindex edf1998..89b28f0 100644\n--- a/app/test/test_distributor_perf.c\n+++ b/app/test/test_distributor_perf.c\n@@ -111,7 +111,7 @@ handle_work(void *arg)\n \tunsigned int count = 0;\n \tunsigned int num = 0;\n \tint i;\n-\tunsigned int id = __sync_fetch_and_add(&worker_idx, 1);\n+\tunsigned int id = __atomic_fetch_add(&worker_idx, 1, __ATOMIC_RELAXED);\n \tstruct rte_mbuf *buf[8] __rte_cache_aligned;\n \n \tfor (i = 0; i < 8; i++)\n",
    "prefixes": [
        "v3",
        "2/3"
    ]
}