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GET /api/patches/29431/?format=api
{ "id": 29431, "url": "https://patches.dpdk.org/api/patches/29431/?format=api", "web_url": "https://patches.dpdk.org/project/dpdk/patch/138d85856e7b5c6c09abfccdb885927458120be8.1506689397.git.echaudro@redhat.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": "<138d85856e7b5c6c09abfccdb885927458120be8.1506689397.git.echaudro@redhat.com>", "list_archive_url": "https://inbox.dpdk.org/dev/138d85856e7b5c6c09abfccdb885927458120be8.1506689397.git.echaudro@redhat.com", "date": "2017-09-29T12:50:45", "name": "[dpdk-dev] doc: Adds reference to use mlockall() in the Programmer's guide", "commit_ref": null, "pull_url": null, "state": "superseded", "archived": true, "hash": "8327c5dba5c7862d132e14cdfb4ecccacfe4fcc4", "submitter": { "id": 672, "url": "https://patches.dpdk.org/api/people/672/?format=api", "name": "Eelco Chaudron", "email": "echaudro@redhat.com" }, "delegate": null, "mbox": "https://patches.dpdk.org/project/dpdk/patch/138d85856e7b5c6c09abfccdb885927458120be8.1506689397.git.echaudro@redhat.com/mbox/", "series": [], "comments": "https://patches.dpdk.org/api/patches/29431/comments/", "check": "success", "checks": "https://patches.dpdk.org/api/patches/29431/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 CF30F5592;\n\tFri, 29 Sep 2017 14:50:37 +0200 (CEST)", "from mx1.redhat.com (mx1.redhat.com [209.132.183.28])\n\tby dpdk.org (Postfix) with ESMTP id F1BF5FFA\n\tfor <dev@dpdk.org>; Fri, 29 Sep 2017 14:50:36 +0200 (CEST)", "from smtp.corp.redhat.com\n\t(int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.13])\n\t(using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits))\n\t(No client certificate requested)\n\tby mx1.redhat.com (Postfix) with ESMTPS id 390454E34A;\n\tFri, 29 Sep 2017 12:50:36 +0000 (UTC)", "from rhvm.com (ovpn-116-180.ams2.redhat.com [10.36.116.180])\n\tby smtp.corp.redhat.com (Postfix) with ESMTP id 8411353CF6;\n\tFri, 29 Sep 2017 12:50:35 +0000 (UTC)" ], "DMARC-Filter": "OpenDMARC Filter v1.3.2 mx1.redhat.com 390454E34A", "Authentication-Results": [ "ext-mx09.extmail.prod.ext.phx2.redhat.com;\n\tdmarc=none (p=none dis=none) header.from=redhat.com", "ext-mx09.extmail.prod.ext.phx2.redhat.com;\n\tspf=fail smtp.mailfrom=echaudro@redhat.com" ], "From": "Eelco Chaudron <echaudro@redhat.com>", "To": "john.mcnamara@intel.com", "Cc": "dev@dpdk.org", "Date": "Fri, 29 Sep 2017 14:50:45 +0200", "Message-Id": "<138d85856e7b5c6c09abfccdb885927458120be8.1506689397.git.echaudro@redhat.com>", "X-Scanned-By": "MIMEDefang 2.79 on 10.5.11.13", "X-Greylist": "Sender IP whitelisted, not delayed by milter-greylist-4.5.16\n\t(mx1.redhat.com [10.5.110.38]); Fri, 29 Sep 2017 12:50:36 +0000 (UTC)", "Subject": "[dpdk-dev] [PATCH] doc: Adds reference to use mlockall() in the\n\tProgrammer's guide", "X-BeenThere": "dev@dpdk.org", "X-Mailman-Version": "2.1.15", "Precedence": "list", "List-Id": "DPDK patches and discussions <dev.dpdk.org>", "List-Unsubscribe": "<http://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": "<http://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": "When I was adding mlockall() to the testpmd application it was\nsuggested to add a reference to the use case of mlockall().\n\nSigned-off-by: Eelco Chaudron <echaudro@redhat.com>\n---\n doc/guides/prog_guide/writing_efficient_code.rst | 14 ++++++++++++++\n 1 file changed, 14 insertions(+)", "diff": "diff --git a/doc/guides/prog_guide/writing_efficient_code.rst b/doc/guides/prog_guide/writing_efficient_code.rst\nindex 8223aceea..3975026ce 100644\n--- a/doc/guides/prog_guide/writing_efficient_code.rst\n+++ b/doc/guides/prog_guide/writing_efficient_code.rst\n@@ -105,6 +105,20 @@ meaning that if all memory access operations are done on the first channel only,\n \n By default, the :ref:`Mempool Library <Mempool_Library>` spreads the addresses of objects among memory channels.\n \n+Locking memory pages\n+~~~~~~~~~~~~~~~~~~~~\n+The underlying operating system is allowed to load/unload memory pages at its own discretion.\n+These page loads could impact the performance, as the process is on hold when the kernel fetches them.\n+\n+To avoid these you could pre-load, and lock them into memory with the mlockall() call.\n+\n+.. code-block:: c\n+\n+ if (mlockall(MCL_CURRENT | MCL_FUTURE)) {\n+ RTE_LOG(NOTICE, USER1, \"mlockall() failed with error \\\"%s\\\"\\n\",\n+ strerror(errno));\n+ }\n+\n Communication Between lcores\n ----------------------------\n \n", "prefixes": [ "dpdk-dev" ] }