linux-kernel - Re: [PATCH v5 11/15] misc: bcm-vk: add BCM_VK

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Date:   Fri, 2 Oct 2020 09:52:11 -0700
From:   Scott Branden <scott.branden@...adcom.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Florian Fainelli <f.fainelli@...il.com>,
        Arnd Bergmann <arnd@...db.de>, Olof Johansson <olof@...om.net>,
        Kees Cook <keescook@...omium.org>,
        linux-kernel@...r.kernel.org,
        bcm-kernel-feedback-list@...adcom.com,
        Desmond Yan <desmond.yan@...adcom.com>
Subject: Re: [PATCH v5 11/15] misc: bcm-vk: add BCM_VK_QSTATS



On 2020-10-01 9:55 p.m., Greg Kroah-Hartman wrote:
> On Thu, Oct 01, 2020 at 03:12:11PM -0700, Scott Branden wrote:
>>
>> On 2020-09-30 7:33 p.m., Florian Fainelli wrote:
>>>
>>> On 9/30/2020 6:28 PM, Scott Branden wrote:
>>>> Add BCM_VK_QSTATS Kconfig option to allow for enabling debug VK
>>>> queue statistics.
>>>>
>>>> These statistics keep track of max, abs_max, and average for the
>>>> messages queues.
>>>>
>>>> Co-developed-by: Desmond Yan <desmond.yan@...adcom.com>
>>>> Signed-off-by: Desmond Yan <desmond.yan@...adcom.com>
>>>> Signed-off-by: Scott Branden <scott.branden@...adcom.com>
>>>> ---
>>> [snip]
>>>
>>>> +#if defined(CONFIG_BCM_VK_QSTATS)
>>>> +    /* clear qstats */
>>>> +    for (i = 0; i < VK_MSGQ_MAX_NR; i++) {
>>>> +        memset(&vk->to_v_msg_chan.qstats[i].qcnts, 0,
>>>> +               sizeof(vk->to_v_msg_chan.qstats[i].qcnts));
>>>> +        memset(&vk->to_h_msg_chan.qstats[i].qcnts, 0,
>>>> +               sizeof(vk->to_h_msg_chan.qstats[i].qcnts));
>>>> +    }
>>>> +#endif
>>>>       /* clear 4096 bits of bitmap */
>>>>       bitmap_clear(vk->bmap, 0, VK_MSG_ID_BITMAP_SIZE);
>>> It was not clear from looking at this patch how are the statistics exposed and how does one actually get them?
>> The QSTATS, since it is only for debug purpose, it will dump out periodically based on processed_num.
>> Nothing fancy as we only compile it in in extreme case for recreating a scenario.
>>
>> The following is the part:
>>
>> +       if (++qcnts->cnt >= BCM_VK_QSTATS_ACC_CNT) {
>> +               /* log average and clear counters */
>> +               dev_info(&vk->pdev->dev,
>> +                        "%s[%d]: Max: [%3d/%3d] Acc %d num %d, Aver %d\n",
>> +                        tag, qstats->q_num,
>> +                        qcnts->max_occ, qcnts->max_abs,
>> +                        qcnts->acc_sum,
>> +                        qcnts->cnt,
>> +                        qcnts->acc_sum / qcnts->cnt);
> Ah, that's not ok, don't flood the kernel log for non-error things
> please.  If you need to "report" stuff, when all is going well, use the
> other common interfaces for that.
>
> Again, drivers, when all is working, are quiet.
Will change to dev_dbg.
>
> thanks,
>
> greg k-h


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