linux-kernel - Re: [PATCH V2 4/4] scsi: ufs-debugfs: Add user-defined exception event rate limiting

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Message-ID: <d00dacbd2a1b57dfdecd184303ab2bee47f3d7f9.camel@gmail.com>
Date:   Mon, 15 Feb 2021 18:10:39 +0100
From:   Bean Huo <huobean@...il.com>
To:     Adrian Hunter <adrian.hunter@...el.com>,
        "Martin K . Petersen" <martin.petersen@...cle.com>,
        "James E . J . Bottomley" <jejb@...ux.ibm.com>
Cc:     linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
        Alim Akhtar <alim.akhtar@...sung.com>,
        Avri Altman <avri.altman@....com>,
        Can Guo <cang@...eaurora.org>,
        Stanley Chu <stanley.chu@...iatek.com>
Subject: Re: [PATCH V2 4/4] scsi: ufs-debugfs: Add user-defined exception
 event rate limiting

On Tue, 2021-02-09 at 08:24 +0200, Adrian Hunter wrote:
> An enabled user-specified exception event that does not clear quickly
> will
> repeatedly cause the handler to run. That could unduly disturb the
> driver
> behaviour being tested or debugged. To prevent that add debugfs file
> exception_event_rate_limit_ms. When a exception event happens, it is
> disabled, and then after a period of time (default 20ms) the
> exception
> event is enabled again.
> 
> Note that if the driver also has that exception event enabled, it
> will not
> be disabled.
> 
> Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
Acked-by: Bean Huo <beanhuo@...ron.com>