netdev - Re: [PATCH net-next] net: sched: don't release block->lock when dumping chains

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Message-Id: <20190225.102528.889340642063227833.davem@davemloft.net>
Date:   Mon, 25 Feb 2019 10:25:28 -0800 (PST)
From:   David Miller <davem@...emloft.net>
To:     vladbu@...lanox.com
Cc:     netdev@...r.kernel.org, jhs@...atatu.com, xiyou.wangcong@...il.com,
        jiri@...nulli.us
Subject: Re: [PATCH net-next] net: sched: don't release block->lock when
 dumping chains

From: Vlad Buslov <vladbu@...lanox.com>
Date: Mon, 25 Feb 2019 17:45:44 +0200

> Function tc_dump_chain() obtains and releases block->lock on each iteration
> of its inner loop that dumps all chains on block. Outputting chain template
> info is fast operation so locking/unlocking mutex multiple times is an
> overhead when lock is highly contested. Modify tc_dump_chain() to only
> obtain block->lock once and dump all chains without releasing it.
> 
> Signed-off-by: Vlad Buslov <vladbu@...lanox.com>
> Suggested-by: Cong Wang <xiyou.wangcong@...il.com>

Applied, thanks Vlad.