linux-kernel - Re: [PATCH 4/6] bpf: hash: convert per-hashtable lock into per-bucket bit spinlock

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Message-ID: <CACVXFVOeh0D+Nf8AVw68-e-aSYtVVLiRoUoDCi89zYXXiUm4gA@mail.gmail.com>
Date:	Wed, 16 Dec 2015 14:58:08 +0800
From:	Ming Lei <tom.leiming@...il.com>
To:	Yang Shi <shy828301@...il.com>
Cc:	Alexei Starovoitov <alexei.starovoitov@...il.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Alexei Starovoitov <ast@...nel.org>,
	"David S. Miller" <davem@...emloft.net>,
	Network Development <netdev@...r.kernel.org>,
	Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [PATCH 4/6] bpf: hash: convert per-hashtable lock into per-bucket
 bit spinlock

On Wed, Dec 16, 2015 at 1:01 PM, Yang Shi <shy828301@...il.com> wrote:

>
> I recalled Steven confirmed raw_spin_lock has the lockdep benefit too in the
> patch review for changing to raw lock.
>
> Please check this thread out
>  http://lists.openwall.net/netdev/2015/10/31/7

OK, looks I was wrong about the lockdep benifit, :-(

But for this lock, I think lockdep isn't such important, because it is the
intermost lock, and it can be used just for protecting the bucket list
and nothing else need to be covered.


Thanks,
Ming Lei
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