linux-kernel - Re: 答复: Re: [PATCH v2] scsi: Introduce sdev_printk

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <20180402052920.GF3795@jagdpanzerIV>
Date:   Mon, 2 Apr 2018 14:29:20 +0900
From:   Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
To:     wen.yang99@....com.cn
Cc:     yanaijie@...wei.com, jejb@...ux.vnet.ibm.com,
        martin.petersen@...cle.com, linux-scsi@...r.kernel.org,
        linux-kernel@...r.kernel.org, Bart.VanAssche@....com,
        pmladek@...e.com, sergey.senozhatsky.work@...il.com, tj@...nel.org,
        jiang.biao2@....com.cn, zhong.weidong@....com.cn, tan.hu@....com.cn
Subject: Re: 答复: Re: [PATCH v2] scsi: Introduce sdev_printk_ratelimited to
 throttlefrequent printk

On (04/02/18 13:14), wen.yang99@....com.cn wrote:
> 
>    > It's true that this print for the same device is useless. But it's
>    > useful for different devices. Is it possible to limit the print only
>    > for the same device?
> 
>    In our scene, it's  just for the same device (q->queuedata), Thanks.

Yes, what Jason meant was that rate limit struct is shared by different call
sites - including scsi_request_fn() from different devices.

If device1->scsi_request_fn()->sdev_printk_ratelimited() causes printk rate
limit, then messages from device2->scsi_request_fn()->sdev_printk_ratelimited()
may be lost entirely, unless you have enough of them.

	-ss