Re: [PATCH 1/2] mac80211: Show pending txqlen in debugfs.

[Ben Greear <greearb@candelatech.com>]

On 12/05/2016 06:54 AM, Johannes Berg wrote:
> On Mon, 2016-12-05 at 06:47 -0800, Ben Greear wrote:
>>
>> On 12/05/2016 05:59 AM, Johannes Berg wrote:
>>>
>>> +static ssize_t misc_read(struct file *file, char __user *user_buf,
>>>>
>>>> +			 size_t count, loff_t *ppos)
>>>> +{
>>>> +	struct ieee80211_local *local = file->private_data;
>>>> +	size_t bufsz = 1000;
>>>> +	char *buf = kzalloc(bufsz, GFP_KERNEL);
>>>
>>> You need at most IEEE80211_MAX_QUEUES * 16 (==256) which I think
>>> you
>>> can put on the stack?
>>
>> I actually run with 64 queues in my tree,
>
> Heh, well, in that case the 1000 is actually potentially too small for
> you :) (it'll work because there never are many packets on the queues
> though)
>
>> and either way, I thought large-ish things on the stack were frowned
>> upon for systems that want to run smaller stacks?
>
> Yeah but the limit is more like 1KB :)
>
> Maybe allocate, but actually do 16*NUM_QUEUES? The 1000 is just
> arbitrarily magic in there.

Sounds good, I'll respin it.

Thanks,
Ben

>
> johannes
>

-- 
Ben Greear <greearb@candelatech.com>
Candela Technologies Inc  http://www.candelatech.com