Anton Ivanov 2eb5f31bc4 um: Switch clocksource to hrtimers ... UML is using an obsolete itimer call for all timers and "polls" for kernel space timer firing in its userspace portion resulting in a long list of bugs and incorrect behaviour(s). It also uses ITIMER_VIRTUAL for its timer which results in the timer being dependent on it running and the cpu load. This patch fixes this by moving to posix high resolution timers firing off CLOCK_MONOTONIC and relaying the timer correctly to the UML userspace. Fixes: - crashes when hosts suspends/resumes - broken userspace timers - effecive ~40Hz instead of what they should be. Note - this modifies skas behavior by no longer setting an itimer per clone(). Timer events are relayed instead. - kernel network packet scheduling disciplines - tcp behaviour especially under load - various timer related corner cases Finally, overall responsiveness of userspace is better. Signed-off-by: Thomas Meyer <thomas@m3y3r.de> Signed-off-by: Anton Ivanov <aivanov@brocade.com> [rw: massaged commit message] Signed-off-by: Richard Weinberger <richard@nod.at>		2015-11-06 22:54:49 +01:00
..
configs
drivers	um: net: replace GFP_KERNEL with GFP_ATOMIC when spinlock is held	2015-11-06 22:51:00 +01:00
include	um: Switch clocksource to hrtimers	2015-11-06 22:54:49 +01:00
kernel	um: Switch clocksource to hrtimers	2015-11-06 22:54:49 +01:00
os-Linux	um: Switch clocksource to hrtimers	2015-11-06 22:54:49 +01:00
scripts
.gitignore
Kconfig.char
Kconfig.common	um: Skip futex_atomic_cmpxchg_inatomic() test	2015-01-04 14:20:26 +01:00
Kconfig.debug
Kconfig.net
Kconfig.rest
Kconfig.um	um: Fix mconsole dependency	2015-05-31 23:27:26 +02:00
Makefile	um: Switch clocksource to hrtimers	2015-11-06 22:54:49 +01:00
Makefile-os-Linux
Makefile-skas