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GET /api/patches/1525727/
HTTP 200 OK
Allow: GET, PUT, PATCH, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

{
    "id": 1525727,
    "url": "http://patchwork.ozlabs.org/api/patches/1525727/",
    "web_url": "http://patchwork.ozlabs.org/project/openvswitch/patch/32227465e3e15ff243439ed6a75d8f3be4ce24cd.1631094144.git.grive@u256.net/",
    "project": {
        "id": 47,
        "url": "http://patchwork.ozlabs.org/api/projects/47/",
        "name": "Open vSwitch",
        "link_name": "openvswitch",
        "list_id": "ovs-dev.openvswitch.org",
        "list_email": "ovs-dev@openvswitch.org",
        "web_url": "http://openvswitch.org/",
        "scm_url": "git@github.com:openvswitch/ovs.git",
        "webscm_url": "https://github.com/openvswitch/ovs",
        "list_archive_url": "",
        "list_archive_url_format": "",
        "commit_url_format": ""
    },
    "msgid": "<32227465e3e15ff243439ed6a75d8f3be4ce24cd.1631094144.git.grive@u256.net>",
    "list_archive_url": null,
    "date": "2021-09-08T09:47:40",
    "name": "[ovs-dev,v5,16/27] dpif-netdev: Postpone flow offload item freeing",
    "commit_ref": null,
    "pull_url": null,
    "state": "new",
    "archived": false,
    "hash": "aa81b81eddc5affa64bfd1ed7ea5704dd7041561",
    "submitter": {
        "id": 78795,
        "url": "http://patchwork.ozlabs.org/api/people/78795/",
        "name": "Gaëtan Rivet",
        "email": "grive@u256.net"
    },
    "delegate": null,
    "mbox": "http://patchwork.ozlabs.org/project/openvswitch/patch/32227465e3e15ff243439ed6a75d8f3be4ce24cd.1631094144.git.grive@u256.net/mbox/",
    "series": [
        {
            "id": 261424,
            "url": "http://patchwork.ozlabs.org/api/series/261424/",
            "web_url": "http://patchwork.ozlabs.org/project/openvswitch/list/?series=261424",
            "date": "2021-09-08T09:47:24",
            "name": "dpif-netdev: Parallel offload processing",
            "version": 5,
            "mbox": "http://patchwork.ozlabs.org/series/261424/mbox/"
        }
    ],
    "comments": "http://patchwork.ozlabs.org/api/patches/1525727/comments/",
    "check": "success",
    "checks": "http://patchwork.ozlabs.org/api/patches/1525727/checks/",
    "tags": {},
    "related": [],
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        "From": "Gaetan Rivet <grive@u256.net>",
        "To": "ovs-dev@openvswitch.org",
        "Date": "Wed,  8 Sep 2021 11:47:40 +0200",
        "Message-Id": "\n <32227465e3e15ff243439ed6a75d8f3be4ce24cd.1631094144.git.grive@u256.net>",
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        "In-Reply-To": "<cover.1631094144.git.grive@u256.net>",
        "References": "<cover.1631094144.git.grive@u256.net>",
        "MIME-Version": "1.0",
        "Cc": "Eli Britstein <elibr@nvidia.com>,\n Maxime Coquelin <maxime.coquelin@redhat.com>",
        "Subject": "[ovs-dev] [PATCH v5 16/27] dpif-netdev: Postpone flow offload item\n\tfreeing",
        "X-BeenThere": "ovs-dev@openvswitch.org",
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    },
    "content": "Profiling the HW offload thread, the flow offload freeing takes\napproximatively 25% of the time. Most of this time is spent waiting on\nthe futex used by the libc free(), as it triggers a syscall and\nreschedule the thread.\n\nAvoid the syscall and its expensive context switch. Batch the offload\nmessages freeing using the RCU.\n\nSigned-off-by: Gaetan Rivet <grive@u256.net>\nReviewed-by: Eli Britstein <elibr@nvidia.com>\nReviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>\n---\n lib/dpif-netdev.c | 11 ++++++++---\n 1 file changed, 8 insertions(+), 3 deletions(-)",
    "diff": "diff --git a/lib/dpif-netdev.c b/lib/dpif-netdev.c\nindex c4672e6e5..c3d211858 100644\n--- a/lib/dpif-netdev.c\n+++ b/lib/dpif-netdev.c\n@@ -2544,14 +2544,19 @@ dp_netdev_alloc_flow_offload(struct dp_netdev_pmd_thread *pmd,\n     return offload;\n }\n \n+static void\n+dp_netdev_free_flow_offload__(struct dp_offload_thread_item *offload)\n+{\n+    free(offload->actions);\n+    free(offload);\n+}\n+\n static void\n dp_netdev_free_flow_offload(struct dp_offload_thread_item *offload)\n {\n     dp_netdev_pmd_unref(offload->pmd);\n     dp_netdev_flow_unref(offload->flow);\n-\n-    free(offload->actions);\n-    free(offload);\n+    ovsrcu_postpone(dp_netdev_free_flow_offload__, offload);\n }\n \n static void\n",
    "prefixes": [
        "ovs-dev",
        "v5",
        "16/27"
    ]
}