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author | Frederic Weisbecker <fweisbec@gmail.com> | 2013-07-12 19:02:30 +0200 |
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committer | Frederic Weisbecker <fweisbec@gmail.com> | 2013-08-13 00:40:44 +0200 |
commit | 2d854e5738cded368a0759f85b1197f5c044513d (patch) | |
tree | 14d2353e1dd594e9b695c250e3955c1da1eaf102 /kernel/kthread.c | |
parent | fbb00b568bc93073452d2a0f9f06e7c33d16eece (diff) | |
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context_tracing: Fix guest accounting with native vtime
1) If context tracking is enabled with native vtime accounting (which
combo is useless except for dev testing), we call vtime_guest_enter()
and vtime_guest_exit() on host <-> guest switches. But those are stubs
in this configurations. As a result, cputime is not correctly flushed
on kvm context switches.
2) If context tracking runs but is disabled on some CPUs, those
CPUs end up calling __guest_enter/__guest_exit which in turn
call vtime_account_system(). We don't want to call this because we
run in tick based accounting for these CPUs.
Refactor the guest_enter/guest_exit code such that all combinations
finally work.
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Li Zhong <zhong@linux.vnet.ibm.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Kevin Hilman <khilman@linaro.org>
Diffstat (limited to 'kernel/kthread.c')
0 files changed, 0 insertions, 0 deletions