Hallo, * Samuel Thibault [Tue, Aug 25 2015, 09:56:39PM]: > Eduard Bloch, le Tue 25 Aug 2015 21:35:36 +0200, a écrit : > > * Samuel Thibault [Tue, Aug 25 2015, 08:54:35PM]: > > > Just so that people reading the log don't take it too exagerated: > > > > > Eduard Bloch, le Tue 25 Aug 2015 20:24:22 +0200, a écrit : > > > > I checked again... about 20% of the time is spent in two calls of pidof > > > > > > We're here talking about ~15ms each. > > > > I don't. It's ~270ms each (I added another log with timestamps). > > How long is the readlink /proc/*/exe | grep?
~70ms (strace -f -tt -o logfile sh -c 'readlink /proc/*/exe | fgrep slash') > > > > And about 70% is spent by loadkeys executing the mentioned storm of > > > > ioctls. > > > > > > And about 70ms. > > > > Or ~1.8s on the mentioned device. > > Ouch. The optimization I mentioned could perhaps reduce that, in a not > too complex setup (shift, alt, control, altgr, capslock modifiers) by a > 4x factor. To go further a kernel patch is really needed, there is no > way around it. Ok, thanks for investigation. Regards, Eduard.
