List comments

GET /api/covers/40986/comments/
Content-Type: application/json
Vary: Accept

        "id": 83757,
        "web_url": "",
        "msgid": "<2515509.GDSIbPj7Zt@xps>",
        "date": "2018-07-13T09:06:45",
        "subject": "Re: [dpdk-dev] [PATCH 0/9] mem: reduce memory fragmentation",
        "submitter": {
            "id": 685,
            "url": "",
            "name": "Thomas Monjalon",
            "email": ""
        "content": "11/06/2018 22:55, Anatoly Burakov:\n> This patchset is mostly dealing with changes fbarray, but it is\n> actually about reducing fragmentation in Linuxapp memalloc.\n> \n> We allocate hugepages from lower VA to higher VA. However, our\n> malloc heap allocates addresses from higher VA to lower VA. This\n> results in a situation where, whenever new page is allocated,\n> malloc starts to allocate memory from the top, leaving fragmented\n> space between new allocation's leftover and previous leftover.\n> \n> Over time, this leads to lots of free elements sitting at page\n> boundaries, small enough to be useful but large enough to have an\n> impact on memory fragmentation in certain circumstances.\n> \n> To fix this, we need to allocate memory from higher VA first.\n> However, in order to do that, we need the ability to search fbarray\n> in reverse, which is currently not supported. Adding this support is\n> what most of this patchset is about.\n> \n> First 4 patches fix some issues in existing fbarray implementation\n> and remove some code duplication, preparing for adding of new\n> functionality.\n> \n> Next 3 patches add new functionality - reverse search of used/free\n> slots, mirroring already existing functionality in semantics and\n> capable of returning identical results but in reverse order.\n> \n> Patch 8 adds unit tests for fbarray, testing both existing and new\n> functionality.\n> \n> Finally, patch 9 changes memalloc to look up free slots in memseg\n> list in reverse order. No other changes is necessary, as all other\n> code can handle segments, wherever they are allocated.\n> \n> Anatoly Burakov (9):\n>   fbarray: fix errno values returned from functions\n>   fbarray: reduce duplication in find_contig code\n>   fbarray: reduce duplication in find_next_n code\n>   fbarray: reduce duplication in find_next code\n>   fbarray: add reverse find_free/used\n>   fbarray: add reverse find n used/free\n>   fbarray: add reverse find contig used/free\n>   test: add fbarray autotests\n>   memalloc: allocate memory in reverse\n\nApplied, thanks",
        "headers": {
            "List-Subscribe": "<>,\n\t<>",
            "Cc": "",
            "X-Original-To": "",
            "Date": "Fri, 13 Jul 2018 11:06:45 +0200",
            "List-Help": "<>",
            "In-Reply-To": "<>",
            "Precedence": "list",
            "X-BeenThere": "",
            "X-ME-Sender": "<xms:p2tIW8QjR0KWPDfbDX0yXFY77lguscJbyPQQvZ0s2GXehMc4L_0gLQ>",
            "DKIM-Signature": [
                "v=1; a=rsa-sha256; c=relaxed/relaxed;; h=\n\tcc:content-transfer-encoding:content-type:date:from:in-reply-to\n\t:message-id:mime-version:references:subject:to:x-me-sender\n\t:x-me-sender:x-sasl-enc; s=mesmtp; bh=3L+6OeUfB7C1VQB6CvdzKm3MTc\n\tninxlRiT5+uF1YkdQ=; b=aVLqndZ4ZNnRj/qBk8nfv+SFTS19J8X95TvL7l69dM\n\tajiQvuIeBnix5toMFsK3LbWAbLL08izd0gvjyGyuUmZIjUQZ9pXevR4I12KyZiZA\n\tti7rp0PcvKNtoxSpwje7IdT64SzwT0GSvteIFjltQqwCjZFn0F/mODdO/SK6oFJ5\n\t4=",
                "v=1; a=rsa-sha256; c=relaxed/relaxed; d=\n\; h=cc:content-transfer-encoding:content-type\n\t:date:from:in-reply-to:message-id:mime-version:references\n\t:subject:to:x-me-sender:x-me-sender:x-sasl-enc; s=fm3; bh=3L+6Oe\n\tUfB7C1VQB6CvdzKm3MTcninxlRiT5+uF1YkdQ=; b=LyHoT85hRYT+bOK3uvwRk6\n\t1qo9Yjcvd7a8nh7LbM7ka5y5v3iLDt4SpG1bLAcPm4K4K85i4BaTQnFv47M3XNc5\n\tNoGI4jx9Eqp7aGt7Y9nLxGQ9uB7VFlngS47honLV0vyoHisb2rTd/cWpHb/ue0Sj\n\tUDj9zJBK1/yUNZHX+BCr+zkgErR5JwU8Q58CTYcm49tXPIRer3KOhMP+KhUu6gsl\n\tx4jfd5aFUvx2YYz7ZkJ4wDA2CvmBANFcNcFLQQk99NKyD8SX9A/YTaAm71d4G6YO\n\t/tGcXPkXGeihq7VnuuQP3AtOnz/4x+De6nkCpsAM4d8cXUVNfyFca+dMB7dg4MBg\n\t=="
            "References": "<>",
            "Content-Type": "text/plain; charset=\"us-ascii\"",
            "To": "Anatoly Burakov <>",
            "X-ME-Proxy": "<xmx:p2tIWxUoJ0Pft20GvaQe3ef0yV9XV5591Bdrz8dWhm-qL9GABAnD3g>\n\t<xmx:p2tIW9A8oT14wHKcawQ4D-cD74e7iF17j1l48lVrsziSUKLlDG7k8A>\n\t<xmx:p2tIWw7Y9BEQdLj_KmC545PNLPpEd3lZFTaIrw6dlBEdHjScRSS1SA>\n\t<xmx:p2tIW4x4cQts1Sroe9t-vjc8w2OR7sr2W9KowfTf6Jon4wZWLr9FEA>\n\t<xmx:p2tIW3yuwP2MHNUxBE17wEvB1lubApO5LFuMuYADT3pUL9_yTX3W7g>\n\t<xmx:p2tIW459qbAQ2faoj_BQ-HepABOcnJAl9UwwgNn3BzBbMH4xlxa_0A>",
            "Errors-To": "",
            "MIME-Version": "1.0",
            "Received": [
                "from [] (localhost [])\n\tby (Postfix) with ESMTP id B5F236CC3;\n\tFri, 13 Jul 2018 11:06:50 +0200 (CEST)",
                "from (\n\t[]) by (Postfix) with ESMTP id C2DFB5B3E\n\tfor <>; Fri, 13 Jul 2018 11:06:48 +0200 (CEST)",
                "from compute1.internal (compute1.nyi.internal [])\n\tby mailout.west.internal (Postfix) with ESMTP id A18041BD;\n\tFri, 13 Jul 2018 05:06:47 -0400 (EDT)",
                "from mailfrontend2 ([])\n\tby compute1.internal (MEProxy); Fri, 13 Jul 2018 05:06:47 -0400",
                "from xps.localnet ( [])\n\tby (Postfix) with ESMTPA id B59B010255;\n\tFri, 13 Jul 2018 05:06:46 -0400 (EDT)"
            "From": "Thomas Monjalon <>",
            "Message-ID": "<2515509.GDSIbPj7Zt@xps>",
            "List-Post": "<>",
            "Sender": "\"dev\" <>",
            "Content-Transfer-Encoding": "7Bit",
            "Subject": "Re: [dpdk-dev] [PATCH 0/9] mem: reduce memory fragmentation",
            "List-Archive": "<>",
            "List-Id": "DPDK patches and discussions <>",
            "List-Unsubscribe": "<>,\n\t<>",
            "Return-Path": "<>",
            "Delivered-To": "",
            "X-Mailman-Version": "2.1.15"