linux-kernel - Re: [PATCH v2 net-next 0/12] bpf: map pre-alloc

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Message-ID: <56DF001D.4000002@fb.com>
Date:	Tue, 8 Mar 2016 08:38:53 -0800
From:	Alexei Starovoitov <ast@...com>
To:	Daniel Wagner <daniel.wagner@...-carit.de>,
	"David S . Miller" <davem@...emloft.net>
CC:	Daniel Borkmann <daniel@...earbox.net>,
	Tom Zanussi <tom.zanussi@...ux.intel.com>,
	Wang Nan <wangnan0@...wei.com>, He Kuang <hekuang@...wei.com>,
	Martin KaFai Lau <kafai@...com>,
	Brendan Gregg <brendan.d.gregg@...il.com>,
	<netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<kernel-team@...com>
Subject: Re: [PATCH v2 net-next 0/12] bpf: map pre-alloc

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!