xen: drop xen_sched_clock in favour of using plain wallclock time

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xen_sched_clock only counts unstolen time.  In principle this should
be useful to the Linux scheduler so that it knows how much time a process
actually consumed.  But in practice this doesn't work very well as the
scheduler expects the sched_clock time to be synchronized between
cpus.  It also uses sched_clock to measure the time a task spends
sleeping, in which case "unstolen time" isn't meaningful.

So just use plain xen_clocksource_read to return wallclock nanoseconds
for sched_clock.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>

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Jeremy Fitzhardinge 2010-07-12 11:49:59 -07:00

parent 31de189f7d

commit 8a22b9996b

2 changed files with 1 additions and 40 deletions

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arch/x86/xen/enlighten.c

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39

arch/x86/xen/time.c

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