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GET /api/patches/40992/?format=api
HTTP 200 OK
Allow: GET, PUT, PATCH, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

{
    "id": 40992,
    "url": "https://patches.dpdk.org/api/patches/40992/?format=api",
    "web_url": "https://patches.dpdk.org/project/dpdk/patch/26cd3a33611c40bcb09cd09d8a1d36d686635271.1528749451.git.anatoly.burakov@intel.com/",
    "project": {
        "id": 1,
        "url": "https://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": "<26cd3a33611c40bcb09cd09d8a1d36d686635271.1528749451.git.anatoly.burakov@intel.com>",
    "list_archive_url": "https://inbox.dpdk.org/dev/26cd3a33611c40bcb09cd09d8a1d36d686635271.1528749451.git.anatoly.burakov@intel.com",
    "date": "2018-06-11T20:55:36",
    "name": "[3/9] fbarray: reduce duplication in find_next_n code",
    "commit_ref": null,
    "pull_url": null,
    "state": "accepted",
    "archived": true,
    "hash": "158bbe3a2250df6d26a3d3962a6eb78ee580680e",
    "submitter": {
        "id": 4,
        "url": "https://patches.dpdk.org/api/people/4/?format=api",
        "name": "Burakov, Anatoly",
        "email": "anatoly.burakov@intel.com"
    },
    "delegate": {
        "id": 1,
        "url": "https://patches.dpdk.org/api/users/1/?format=api",
        "username": "tmonjalo",
        "first_name": "Thomas",
        "last_name": "Monjalon",
        "email": "thomas@monjalon.net"
    },
    "mbox": "https://patches.dpdk.org/project/dpdk/patch/26cd3a33611c40bcb09cd09d8a1d36d686635271.1528749451.git.anatoly.burakov@intel.com/mbox/",
    "series": [
        {
            "id": 85,
            "url": "https://patches.dpdk.org/api/series/85/?format=api",
            "web_url": "https://patches.dpdk.org/project/dpdk/list/?series=85",
            "date": "2018-06-11T20:55:33",
            "name": "mem: reduce memory fragmentation",
            "version": 1,
            "mbox": "https://patches.dpdk.org/series/85/mbox/"
        }
    ],
    "comments": "https://patches.dpdk.org/api/patches/40992/comments/",
    "check": "success",
    "checks": "https://patches.dpdk.org/api/patches/40992/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 DC7F91DEA4;\n\tMon, 11 Jun 2018 22:56:01 +0200 (CEST)",
            "from mga03.intel.com (mga03.intel.com [134.134.136.65])\n\tby dpdk.org (Postfix) with ESMTP id 167331D940\n\tfor <dev@dpdk.org>; Mon, 11 Jun 2018 22:55:46 +0200 (CEST)",
            "from orsmga008.jf.intel.com ([10.7.209.65])\n\tby orsmga103.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384;\n\t11 Jun 2018 13:55:44 -0700",
            "from irvmail001.ir.intel.com ([163.33.26.43])\n\tby orsmga008.jf.intel.com with ESMTP; 11 Jun 2018 13:55:43 -0700",
            "from sivswdev01.ir.intel.com (sivswdev01.ir.intel.com\n\t[10.237.217.45])\n\tby irvmail001.ir.intel.com (8.14.3/8.13.6/MailSET/Hub) with ESMTP id\n\tw5BKthcq026374 for <dev@dpdk.org>; Mon, 11 Jun 2018 21:55:43 +0100",
            "from sivswdev01.ir.intel.com (localhost [127.0.0.1])\n\tby sivswdev01.ir.intel.com with ESMTP id w5BKtg3b021583\n\tfor <dev@dpdk.org>; Mon, 11 Jun 2018 21:55:42 +0100",
            "(from aburakov@localhost)\n\tby sivswdev01.ir.intel.com with LOCAL id w5BKtgkD021577\n\tfor dev@dpdk.org; Mon, 11 Jun 2018 21:55:42 +0100"
        ],
        "X-Amp-Result": "SKIPPED(no attachment in message)",
        "X-Amp-File-Uploaded": "False",
        "X-ExtLoop1": "1",
        "X-IronPort-AV": "E=Sophos;i=\"5.51,211,1526367600\"; d=\"scan'208\";a=\"48522982\"",
        "From": "Anatoly Burakov <anatoly.burakov@intel.com>",
        "To": "dev@dpdk.org",
        "Date": "Mon, 11 Jun 2018 21:55:36 +0100",
        "Message-Id": "<26cd3a33611c40bcb09cd09d8a1d36d686635271.1528749451.git.anatoly.burakov@intel.com>",
        "X-Mailer": "git-send-email 1.7.0.7",
        "In-Reply-To": [
            "<cover.1528749451.git.anatoly.burakov@intel.com>",
            "<cover.1528749451.git.anatoly.burakov@intel.com>"
        ],
        "References": [
            "<cover.1528749451.git.anatoly.burakov@intel.com>",
            "<cover.1528749451.git.anatoly.burakov@intel.com>"
        ],
        "Subject": "[dpdk-dev] [PATCH 3/9] fbarray: reduce duplication in find_next_n\n\tcode",
        "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://dpdk.org/ml/options/dev>,\n\t<mailto:dev-request@dpdk.org?subject=unsubscribe>",
        "List-Archive": "<http://dpdk.org/ml/archives/dev/>",
        "List-Post": "<mailto:dev@dpdk.org>",
        "List-Help": "<mailto:dev-request@dpdk.org?subject=help>",
        "List-Subscribe": "<https://dpdk.org/ml/listinfo/dev>,\n\t<mailto:dev-request@dpdk.org?subject=subscribe>",
        "Errors-To": "dev-bounces@dpdk.org",
        "Sender": "\"dev\" <dev-bounces@dpdk.org>"
    },
    "content": "Mostly code move, aside from more quick checks done to avoid\ndoing computations in obviously hopeless cases.\n\nSigned-off-by: Anatoly Burakov <anatoly.burakov@intel.com>\n---\n lib/librte_eal/common/eal_common_fbarray.c | 63 ++++++++++++----------\n 1 file changed, 36 insertions(+), 27 deletions(-)",
    "diff": "diff --git a/lib/librte_eal/common/eal_common_fbarray.c b/lib/librte_eal/common/eal_common_fbarray.c\nindex e37fe1e4d..c5ee017dd 100644\n--- a/lib/librte_eal/common/eal_common_fbarray.c\n+++ b/lib/librte_eal/common/eal_common_fbarray.c\n@@ -723,54 +723,63 @@ rte_fbarray_find_next_used(struct rte_fbarray *arr, unsigned int start)\n \treturn ret;\n }\n \n-int __rte_experimental\n-rte_fbarray_find_next_n_free(struct rte_fbarray *arr, unsigned int start,\n-\t\tunsigned int n)\n+static int\n+fbarray_find_n(struct rte_fbarray *arr, unsigned int start, unsigned int n,\n+\t\tbool used)\n {\n \tint ret = -1;\n \n-\tif (arr == NULL || start >= arr->len || n > arr->len) {\n+\tif (arr == NULL || start >= arr->len || n > arr->len || n == 0) {\n \t\trte_errno = EINVAL;\n \t\treturn -1;\n \t}\n+\tif (arr->len - start < n) {\n+\t\trte_errno = used ? ENOENT : ENOSPC;\n+\t\treturn -1;\n+\t}\n \n \t/* prevent array from changing under us */\n \trte_rwlock_read_lock(&arr->rwlock);\n \n-\tif (arr->len == arr->count || arr->len - arr->count < n) {\n-\t\trte_errno = ENOSPC;\n-\t\tgoto out;\n+\t/* cheap checks to prevent doing useless work */\n+\tif (!used) {\n+\t\tif (arr->len == arr->count || arr->len - arr->count < n) {\n+\t\t\trte_errno = ENOSPC;\n+\t\t\tgoto out;\n+\t\t}\n+\t\tif (arr->count == 0) {\n+\t\t\tret = start;\n+\t\t\tgoto out;\n+\t\t}\n+\t} else {\n+\t\tif (arr->count < n) {\n+\t\t\trte_errno = ENOENT;\n+\t\t\tgoto out;\n+\t\t}\n+\t\tif (arr->count == arr->len) {\n+\t\t\tret = start;\n+\t\t\tgoto out;\n+\t\t}\n \t}\n \n-\tret = find_next_n(arr, start, n, false);\n+\tret = find_next_n(arr, start, n, used);\n out:\n \trte_rwlock_read_unlock(&arr->rwlock);\n \treturn ret;\n }\n \n int __rte_experimental\n-rte_fbarray_find_next_n_used(struct rte_fbarray *arr, unsigned int start,\n+rte_fbarray_find_next_n_free(struct rte_fbarray *arr, unsigned int start,\n \t\tunsigned int n)\n {\n-\tint ret = -1;\n-\n-\tif (arr == NULL || start >= arr->len || n > arr->len) {\n-\t\trte_errno = EINVAL;\n-\t\treturn -1;\n-\t}\n-\n-\t/* prevent array from changing under us */\n-\trte_rwlock_read_lock(&arr->rwlock);\n-\n-\tif (arr->count < n) {\n-\t\trte_errno = ENOENT;\n-\t\tgoto out;\n-\t}\n+\treturn fbarray_find_n(arr, start, n, false);\n+}\n \n-\tret = find_next_n(arr, start, n, true);\n-out:\n-\trte_rwlock_read_unlock(&arr->rwlock);\n-\treturn ret;\n+int __rte_experimental\n+rte_fbarray_find_next_n_used(struct rte_fbarray *arr, unsigned int start,\n+\t\tunsigned int n)\n+{\n+\treturn fbarray_find_n(arr, start, n, true);\n }\n \n static int\n",
    "prefixes": [
        "3/9"
    ]
}