linux-kernel - Re: [PATCH v2 3/3] bpf: hash: use per-bucket spinlock

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Date:	Tue, 29 Dec 2015 17:27:07 +0100
From:	Daniel Borkmann <daniel@...earbox.net>
To:	Ming Lei <tom.leiming@...il.com>, linux-kernel@...r.kernel.org,
	Alexei Starovoitov <ast@...nel.org>
CC:	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: [PATCH v2 3/3] bpf: hash: use per-bucket spinlock

On 12/29/2015 03:40 PM, Ming Lei wrote:
> Both htab_map_update_elem() and htab_map_delete_elem() can be
> called from eBPF program, and they may be in kernel hot path,
> so it isn't efficient to use a per-hashtable lock in this two
> helpers.
>
> The per-hashtable spinlock is used for protecting bucket's
> hlist, and per-bucket lock is just enough. This patch converts
> the per-hashtable lock into per-bucket spinlock, so that
> contention can be decreased a lot.
>
> Signed-off-by: Ming Lei <tom.leiming@...il.com>

Looks better, thanks!

Acked-by: Daniel Borkmann <daniel@...earbox.net>
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