xmodmap really slow

[Alan Hourihane]

On 30/07/2018 23:25, Alan Hourihane wrote:
> On 30/07/18 22:00, Adam Jackson wrote:
>> On Thu, 2018-07-26 at 12:25 +0100, Alan Hourihane wrote:
>>> Anyone tried just doing this recently....
>>>
>>> xmodmap -pke > /tmp/keydump
>>> xmodmap /tmp/keydump
>>>
>>> And watch the Xserver hang for quite some time.
>> Seems to be nearly instantaneous against an Xvfb, but did cause a
>> noticable hiccup with Xorg. Haven't investigated more closely, so I'd
>> suspect (in rough order of likelihood):
>>
>> a) something super-linear in the number of input devices
>> b) some weird slow ioctl syncing the X state to the kernel
>> c) somehow you end up on the "lets spawn xkbcomp" path and the
>> fork/exec overhead kills you
>>
> Definitely not the last, moving "xkbcomp" from /usr/bin results in the
> same issue.

Just checking.....

Has anyone looked into this issue ?

Alan.