On Fri, Oct 02, 2020 at 03:42:52PM +0200, Andrzej Pietrasiewicz wrote: > Hi, > > W dniu 02.10.2020 o 14:54, Greg Kroah-Hartman pisze: > > On Tue, Aug 18, 2020 at 01:28:25PM +0200, Andrzej Pietrasiewicz wrote: > > > Userland might want to execute e.g. 'w' (show blocked tasks), followed > > > by 's' (sync), followed by 1000 ms delay and then followed by 'c' (crash) > > > upon a single magic SysRq. Or one might want to execute the famous "Raising > > > Elephants Is So Utterly Boring" action. This patch adds a configurable > > > handler, triggered with 'C', for this exact purpose. The user specifies the > > > composition of the compound action using syntax similar to getopt, where > > > each letter corresponds to an individual action and a colon followed by a > > > number corresponds to a delay of that many milliseconds, e.g.: > > > > > > ws:1000c > > > > > > or > > > > > > r:100eis:1000ub > > > > A macro language for sysrq commands, who would have thought... > > > > Anyway, _why_ would userland want to do something so crazy as this? > > What is the use-case here? > > > > A use-case is Chromebooks which do want to execute 'w', 's', > wait 1000ms and then 'c' under one key combination. Having that supported > upstream brings us one little step closer to those machines running > upstream kernel. Who is causing that to "execute"? Some daemon/program? > Another argument for such a "macro language" is when a machine's system > keeps degrading over time, possibly degrading (relatively) fast. > "Raising Elephants Is So Utterly Boring" consists of 6 actions, each > of which requires pressing several keys. The user might be unable > to complete all the 6 steps, while a "macro" requires user's involvement > for carrying out just one step. So you want to "preload" some commands ahead of time, for when you get in trouble? These should just be debugging / last resort types of things, how regular are they being used in your systems? thanks, greg k-h _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
