From: Ingo Molnar <mingo@kernel.org>
To: Dmitry Vyukov <dvyukov@google.com>
Cc: Peter Zijlstra <peterz@infradead.org>,
Wang Nan <wangnan0@huawei.com>, Ingo Molnar <mingo@redhat.com>,
LKML <linux-kernel@vger.kernel.org>,
He Kuang <hekuang@huawei.com>,
Alexei Starovoitov <ast@kernel.org>,
Arnaldo Carvalho de Melo <acme@redhat.com>,
Brendan Gregg <brendan.d.gregg@gmail.com>,
Jiri Olsa <jolsa@kernel.org>,
Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>,
Namhyung Kim <namhyung@kernel.org>, Zefan Li <lizefan@huawei.com>,
pi3orama@163.com
Subject: Re: [RESEND PATCH 0/5] perf core: Support overwrite ring buffer
Date: Tue, 8 Mar 2016 18:57:53 +0100 [thread overview]
Message-ID: <20160308175753.GA3015@gmail.com> (raw)
In-Reply-To: <20160308174856.GA28862@gmail.com>
* Ingo Molnar <mingo@kernel.org> wrote:
> Things got a lot more lively after that!
>
> But most of the overhead seems to come from systemd trying to dump core or
> something like that:
>
> 85872 mingo 20 0 34712 3016 2656 S 4.6 0.0 0:00.14 systemd-coredum
> 85440 mingo 20 0 34712 3028 2664 S 4.2 0.0 0:00.13 systemd-coredum
> 85751 mingo 20 0 34712 3076 2716 S 4.2 0.0 0:00.13 systemd-coredum
> 85840 mingo 20 0 34712 2988 2624 S 4.2 0.0 0:00.13 systemd-coredum
> 85861 mingo 20 0 34712 3080 2720 S 4.2 0.0 0:00.13 systemd-coredum
> 85954 mingo 20 0 34712 3028 2664 S 4.2 0.0 0:00.13 systemd-coredum
>
> and I have:
>
> fomalhaut:~/go/src/github.com/google/syzkaller> ulimit -c
> 0
>
> weird ... Has any of you seen such behavior?
So the workaround for that is to disable systemd trying to log every core dump to
the system journal (!), via:
echo > /proc/sys/kernel/core_pattern
Thanks,
Ingo
next prev parent reply other threads:[~2016-03-08 17:58 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-03-07 3:50 [RESEND PATCH 0/5] perf core: Support overwrite ring buffer Wang Nan
2016-03-07 3:50 ` [RESEND PATCH 1/5] perf core: Introduce new ioctl options to pause and resume " Wang Nan
2016-03-07 3:50 ` [RESEND PATCH 2/5] perf core: Set event's default overflow_handler Wang Nan
2016-03-07 3:50 ` [RESEND PATCH 3/5] perf core: Prepare writing into ring buffer from end Wang Nan
2016-03-07 3:50 ` [RESEND PATCH 4/5] perf core: Add backward attribute to perf event Wang Nan
2016-03-07 3:50 ` [RESEND PATCH 5/5] perf core: Reduce perf event output overhead by new overflow handler Wang Nan
2016-03-08 13:44 ` [RESEND PATCH 0/5] perf core: Support overwrite ring buffer Peter Zijlstra
2016-03-08 13:49 ` Ingo Molnar
2016-03-08 13:57 ` Peter Zijlstra
2016-03-08 15:29 ` Ingo Molnar
2016-03-08 15:35 ` Dmitry Vyukov
2016-03-08 15:54 ` Ingo Molnar
2016-03-08 16:11 ` Dmitry Vyukov
2016-03-08 16:27 ` Ingo Molnar
2016-03-08 16:29 ` Dmitry Vyukov
2016-03-08 16:32 ` Peter Zijlstra
2016-03-08 16:44 ` Ingo Molnar
2016-03-08 16:48 ` Ingo Molnar
2016-03-08 16:59 ` Dmitry Vyukov
2016-03-08 17:24 ` Ingo Molnar
2016-03-08 17:27 ` Dmitry Vyukov
2016-03-08 17:37 ` Ingo Molnar
2016-03-08 17:41 ` Dmitry Vyukov
2016-03-08 17:48 ` Ingo Molnar
2016-03-08 17:56 ` Dmitry Vyukov
2016-03-08 17:56 ` Peter Zijlstra
2016-03-08 17:57 ` Ingo Molnar [this message]
2016-03-08 18:02 ` Ingo Molnar
2016-03-08 18:22 ` Ingo Molnar
2016-03-08 18:31 ` Ingo Molnar
2016-03-08 17:55 ` Peter Zijlstra
2016-03-08 16:30 ` Peter Zijlstra
2016-03-09 10:53 ` Borislav Petkov
2016-03-09 11:19 ` Dmitry Vyukov
2016-03-08 19:56 ` Jiri Olsa
2016-03-08 20:07 ` Peter Zijlstra
2016-03-08 20:44 ` Jiri Olsa
2016-03-08 21:04 ` Peter Zijlstra
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