lkml.org 
[lkml]   [2012]   [Aug]   [14]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
SubjectRe: [PATCH 02/19] Input: Improve the events-per-packet estimate
From
On Tue, Aug 14, 2012 at 1:01 PM, Henrik Rydberg <rydberg@euromail.se> wrote:
> Hi Ping,
>
> Long time no see. :-)
>
>> > + /* Make room for KEY and MSC events */
>> > + events += 7;
>>
>> It is nice to get rid of the redundant pieces and to incorporate
>> common functions. Thank you.
>>
>> I have a question about the code above though. Why do we use 7
>> instead of going through the keys like:
>>
>> for (i = 0; i < KEY_MAX; i++)
>> if (test_bit(i, dev->keybit))
>> events++;
>
> Keyboards register a large amount of different keys, but seldom send
> more than one or two at a time. The value 7 is ad hoc, admittedly, but
> it makes the default buffer 8 bytes, which happens to precisely match
> the default buffer in evdev.

That can be a valid reason until we need to report more keys
simultaneously. Please update the comments so we know why we end up
with 7.

Thank you.

Ping


\
 
 \ /
  Last update: 2012-08-14 23:42    [W:0.136 / U:0.452 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site