From: Alexei Starovoitov <ast@fb.com>
To: Daniel Wagner <daniel.wagner@bmw-carit.de>,
"David S . Miller" <davem@davemloft.net>
Cc: Daniel Borkmann <daniel@iogearbox.net>,
Tom Zanussi <tom.zanussi@linux.intel.com>,
Wang Nan <wangnan0@huawei.com>, He Kuang <hekuang@huawei.com>,
Martin KaFai Lau <kafai@fb.com>,
Brendan Gregg <brendan.d.gregg@gmail.com>,
<netdev@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
<kernel-team@fb.com>
Subject: Re: [PATCH v2 net-next 0/12] bpf: map pre-alloc
Date: Tue, 8 Mar 2016 08:38:53 -0800 [thread overview]
Message-ID: <56DF001D.4000002@fb.com> (raw)
In-Reply-To: <56DE97A8.1050309@bmw-carit.de>
On 3/8/16 1:13 AM, Daniel Wagner wrote:
>> Some time back Daniel Wagner reported crashes when bpf hash map is
>> >used to compute time intervals between preempt_disable->preempt_enable
>> >and recently Tom Zanussi reported a dead lock in iovisor/bcc/funccount
>> >tool if it's used to count the number of invocations of kernel
>> >'*spin*' functions. Both problems are due to the recursive use of
>> >slub and can only be solved by pre-allocating all map elements.
>
> I gave it a short spin and lathist sample works just fine.
awesome. Thanks for testing!
next prev parent reply other threads:[~2016-03-08 16:40 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-03-08 5:57 [PATCH v2 net-next 0/12] bpf: map pre-alloc Alexei Starovoitov
2016-03-08 5:57 ` [PATCH v2 net-next 01/12] bpf: prevent kprobe+bpf deadlocks Alexei Starovoitov
2016-03-08 5:57 ` [PATCH v2 net-next 02/12] bpf: introduce percpu_freelist Alexei Starovoitov
2016-03-08 5:57 ` [PATCH v2 net-next 03/12] bpf: pre-allocate hash map elements Alexei Starovoitov
2016-03-08 5:57 ` [PATCH v2 net-next 04/12] bpf: check for reserved flag bits in array and stack maps Alexei Starovoitov
2016-03-08 5:57 ` [PATCH v2 net-next 05/12] bpf: convert stackmap to pre-allocation Alexei Starovoitov
2016-03-08 5:57 ` [PATCH v2 net-next 06/12] samples/bpf: make map creation more verbose Alexei Starovoitov
2016-03-08 5:57 ` [PATCH v2 net-next 07/12] samples/bpf: move ksym_search() into library Alexei Starovoitov
2016-03-08 5:57 ` [PATCH v2 net-next 08/12] samples/bpf: add map_flags to bpf loader Alexei Starovoitov
2016-03-08 5:57 ` [PATCH v2 net-next 09/12] samples/bpf: test both pre-alloc and normal maps Alexei Starovoitov
2016-03-08 9:13 ` [PATCH v2 net-next 0/12] bpf: map pre-alloc Daniel Wagner
2016-03-08 16:38 ` Alexei Starovoitov [this message]
2016-03-08 20:31 ` David Miller
2016-03-08 23:05 ` Alexei Starovoitov
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