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{
    "id": 816337,
    "url": "http://patchwork.ozlabs.org/api/patches/816337/?format=api",
    "web_url": "http://patchwork.ozlabs.org/project/netdev/patch/20170920161159.25747-1-joelaf@google.com/",
    "project": {
        "id": 7,
        "url": "http://patchwork.ozlabs.org/api/projects/7/?format=api",
        "name": "Linux network development",
        "link_name": "netdev",
        "list_id": "netdev.vger.kernel.org",
        "list_email": "netdev@vger.kernel.org",
        "web_url": null,
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        "webscm_url": null,
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    "msgid": "<20170920161159.25747-1-joelaf@google.com>",
    "list_archive_url": null,
    "date": "2017-09-20T16:11:56",
    "name": "[v4,1/4] samples/bpf: Use getppid instead of getpgrp for array map stress",
    "commit_ref": null,
    "pull_url": null,
    "state": "accepted",
    "archived": true,
    "hash": "cb039fbd363b3c506deb0f9469c195216539a4b3",
    "submitter": {
        "id": 72107,
        "url": "http://patchwork.ozlabs.org/api/people/72107/?format=api",
        "name": "Joel Fernandes",
        "email": "joelaf@google.com"
    },
    "delegate": {
        "id": 34,
        "url": "http://patchwork.ozlabs.org/api/users/34/?format=api",
        "username": "davem",
        "first_name": "David",
        "last_name": "Miller",
        "email": "davem@davemloft.net"
    },
    "mbox": "http://patchwork.ozlabs.org/project/netdev/patch/20170920161159.25747-1-joelaf@google.com/mbox/",
    "series": [
        {
            "id": 4158,
            "url": "http://patchwork.ozlabs.org/api/series/4158/?format=api",
            "web_url": "http://patchwork.ozlabs.org/project/netdev/list/?series=4158",
            "date": "2017-09-20T16:04:32",
            "name": "Add cross-compilation support to eBPF samples",
            "version": 4,
            "mbox": "http://patchwork.ozlabs.org/series/4158/mbox/"
        }
    ],
    "comments": "http://patchwork.ozlabs.org/api/patches/816337/comments/",
    "check": "pending",
    "checks": "http://patchwork.ozlabs.org/api/patches/816337/checks/",
    "tags": {},
    "related": [],
    "headers": {
        "Return-Path": "<netdev-owner@vger.kernel.org>",
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        "X-Received": "by 10.99.151.2 with SMTP id n2mr2784297pge.315.1505923931246;\n\tWed, 20 Sep 2017 09:12:11 -0700 (PDT)",
        "From": "Joel Fernandes <joelaf@google.com>",
        "To": "linux-kernel@vger.kernel.org",
        "Cc": "netdev@vger.kernel.org, alison@she-devel.com, juri.lelli@arm.com,\n\tfengc@google.com, daniel@iogearbox.net, davem@davemloft.net,\n\tast@kernel.org, kernel-team@android.com,\n\tJoel Fernandes <joelaf@google.com>",
        "Subject": "[PATCH v4 1/4] samples/bpf: Use getppid instead of getpgrp for\n\tarray map stress",
        "Date": "Wed, 20 Sep 2017 09:11:56 -0700",
        "Message-Id": "<20170920161159.25747-1-joelaf@google.com>",
        "X-Mailer": "git-send-email 2.14.1.821.g8fa685d3b7-goog",
        "Sender": "netdev-owner@vger.kernel.org",
        "Precedence": "bulk",
        "List-ID": "<netdev.vger.kernel.org>",
        "X-Mailing-List": "netdev@vger.kernel.org"
    },
    "content": "When cross-compiling the bpf sample map_perf_test for aarch64, I find that\n__NR_getpgrp is undefined. This causes build errors. This syscall is deprecated\nand requires defining __ARCH_WANT_SYSCALL_DEPRECATED. To avoid having to define\nthat, just use a different syscall (getppid) for the array map stress test.\n\nAcked-by: Alexei Starovoitov <ast@kernel.org>\nSigned-off-by: Joel Fernandes <joelaf@google.com>\n---\n samples/bpf/map_perf_test_kern.c | 2 +-\n samples/bpf/map_perf_test_user.c | 2 +-\n 2 files changed, 2 insertions(+), 2 deletions(-)",
    "diff": "diff --git a/samples/bpf/map_perf_test_kern.c b/samples/bpf/map_perf_test_kern.c\nindex 098c857f1eda..2b2ffb97018b 100644\n--- a/samples/bpf/map_perf_test_kern.c\n+++ b/samples/bpf/map_perf_test_kern.c\n@@ -266,7 +266,7 @@ int stress_hash_map_lookup(struct pt_regs *ctx)\n \treturn 0;\n }\n \n-SEC(\"kprobe/sys_getpgrp\")\n+SEC(\"kprobe/sys_getppid\")\n int stress_array_map_lookup(struct pt_regs *ctx)\n {\n \tu32 key = 1, i;\ndiff --git a/samples/bpf/map_perf_test_user.c b/samples/bpf/map_perf_test_user.c\nindex f388254896f6..a0310fc70057 100644\n--- a/samples/bpf/map_perf_test_user.c\n+++ b/samples/bpf/map_perf_test_user.c\n@@ -282,7 +282,7 @@ static void test_array_lookup(int cpu)\n \n \tstart_time = time_get_ns();\n \tfor (i = 0; i < max_cnt; i++)\n-\t\tsyscall(__NR_getpgrp, 0);\n+\t\tsyscall(__NR_getppid, 0);\n \tprintf(\"%d:array_lookup %lld lookups per sec\\n\",\n \t       cpu, max_cnt * 1000000000ll * 64 / (time_get_ns() - start_time));\n }\n",
    "prefixes": [
        "v4",
        "1/4"
    ]
}