linux-kernel - Re: [PATCH net v2] rds: Fix incorrect statistics counting

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Message-Id: <20170907.200733.1562967291105061977.davem@davemloft.net>
Date:   Thu, 07 Sep 2017 20:07:33 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     Haakon.Bugge@...cle.com
Cc:     santosh.shilimkar@...cle.com, netdev@...r.kernel.org,
        linux-rdma@...r.kernel.org, rds-devel@....oracle.com,
        linux-kernel@...r.kernel.org, knut.omang@...cle.com
Subject: Re: [PATCH net v2] rds: Fix incorrect statistics counting

From: Håkon Bugge <Haakon.Bugge@...cle.com>
Date: Wed,  6 Sep 2017 18:35:51 +0200

> In rds_send_xmit() there is logic to batch the sends. However, if
> another thread has acquired the lock and has incremented the send_gen,
> it is considered a race and we yield. The code incrementing the
> s_send_lock_queue_raced statistics counter did not count this event
> correctly.
> 
> This commit counts the race condition correctly.
> 
> Changes from v1:
> - Removed check for *someone_on_xmit()*
> - Fixed incorrect indentation
> 
> Signed-off-by: Håkon Bugge <haakon.bugge@...cle.com>
> Reviewed-by: Knut Omang <knut.omang@...cle.com>

Applied.