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

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Message-ID: <15206a8d-81f5-f63a-6d0b-178112bf6380@broadcom.com>
Date:   Fri, 2 Oct 2020 09:54:02 -0700
From:   Scott Branden <scott.branden@...adcom.com>
To:     Florian Fainelli <f.fainelli@...il.com>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Olof Johansson <olof@...om.net>
Cc:     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 3:13 p.m., Florian Fainelli wrote:
>
>
> On 10/1/2020 3:12 PM, 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.
>
> But what kind of interface is that? Cannot you at least expose those through sysfs if nothing else?
A sysfs interface would not be as useful as we want the dmesg timestamp information.
QSTATS are purely for development/debug issues and enabled via a CONFIG option that won't be turned on by normal users.
 Will change to dev_dbg.


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