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[ { "id": 83757, "web_url": "http://patches.dpdk.org/comment/83757/", "msgid": "<2515509.GDSIbPj7Zt@xps>", "list_archive_url": "https://inbox.dpdk.org/dev/2515509.GDSIbPj7Zt@xps", "date": "2018-07-13T09:06:45", "subject": "Re: [dpdk-dev] [PATCH 0/9] mem: reduce memory fragmentation", "submitter": { "id": 685, "url": "http://patches.dpdk.org/api/people/685/?format=api", "name": "Thomas Monjalon", "email": "thomas@monjalon.net" }, "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": { "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 B5F236CC3;\n\tFri, 13 Jul 2018 11:06:50 +0200 (CEST)", "from wout5-smtp.messagingengine.com (wout5-smtp.messagingengine.com\n\t[64.147.123.21]) by dpdk.org (Postfix) with ESMTP id C2DFB5B3E\n\tfor <dev@dpdk.org>; Fri, 13 Jul 2018 11:06:48 +0200 (CEST)", "from compute1.internal (compute1.nyi.internal [10.202.2.41])\n\tby mailout.west.internal (Postfix) with ESMTP id A18041BD;\n\tFri, 13 Jul 2018 05:06:47 -0400 (EDT)", "from mailfrontend2 ([10.202.2.163])\n\tby compute1.internal (MEProxy); Fri, 13 Jul 2018 05:06:47 -0400", "from xps.localnet (184.203.134.77.rev.sfr.net [77.134.203.184])\n\tby mail.messagingengine.com (Postfix) with ESMTPA id B59B010255;\n\tFri, 13 Jul 2018 05:06:46 -0400 (EDT)" ], "DKIM-Signature": [ "v=1; a=rsa-sha256; c=relaxed/relaxed; d=monjalon.net; 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\tmessagingengine.com; 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==" ], "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>", "X-ME-Sender": "<xms:p2tIW8QjR0KWPDfbDX0yXFY77lguscJbyPQQvZ0s2GXehMc4L_0gLQ>", "From": "Thomas Monjalon <thomas@monjalon.net>", "To": "Anatoly Burakov <anatoly.burakov@intel.com>", "Cc": "dev@dpdk.org", "Date": "Fri, 13 Jul 2018 11:06:45 +0200", "Message-ID": "<2515509.GDSIbPj7Zt@xps>", "In-Reply-To": "<cover.1528749451.git.anatoly.burakov@intel.com>", "References": "<cover.1528749451.git.anatoly.burakov@intel.com>", "MIME-Version": "1.0", "Content-Transfer-Encoding": "7Bit", "Content-Type": "text/plain; charset=\"us-ascii\"", "Subject": "Re: [dpdk-dev] [PATCH 0/9] mem: reduce memory fragmentation", "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>" }, "addressed": null } ]