On 30/11/2018 09:38, Alan Hourihane wrote: > 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 ?
Running perf top while it's happening shows this.... 26.77% Xorg [.] ResourceClientBits 15.09% Xorg [.] GrabMatchesSecond 12.62% Xorg [.] DetailSupersedesSecond.isra.1 12.55% Xorg [.] DeletePassiveGrabFromList 8.83% Xorg [.] GrabSupersedesSecond 5.55% Xorg [.] AddPassiveGrabToList 3.09% Xorg [.] DeletePassiveGrab 2.00% Xorg [.] xi2mask_merge 1.16% libc-2.27.so [.] _int_malloc 0.92% libc-2.27.so [.] _int_free 0.59% Xorg [.] XkbSendMap Xorg is totally frozen while this is happening. No rendering occurs at all. Alan. _______________________________________________ xorg-devel@lists.x.org: X.Org development Archives: http://lists.x.org/archives/xorg-devel Info: https://lists.x.org/mailman/listinfo/xorg-devel