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authorFrederic Weisbecker <fweisbec@gmail.com>2013-07-12 19:05:14 +0200
committerFrederic Weisbecker <fweisbec@gmail.com>2013-08-13 00:40:44 +0200
commit5b206d48e58204e84d249c4eb18651a1ff7a1274 (patch)
treec97a8158df0ff854d1d6389ddde5cc1fa53bae92 /include/linux
parent2d854e5738cded368a0759f85b1197f5c044513d (diff)
vtime: Update a few comments
Update a stale comment from the old vtime era and document some locking that might be non obvious. 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 'include/linux')
-rw-r--r--include/linux/context_tracking.h10
1 files changed, 4 insertions, 6 deletions
diff --git a/include/linux/context_tracking.h b/include/linux/context_tracking.h
index 5984f2556d13..d883ff0dd8fc 100644
--- a/include/linux/context_tracking.h
+++ b/include/linux/context_tracking.h
@@ -72,8 +72,9 @@ extern void guest_exit(void);
static inline void guest_enter(void)
{
/*
- * This is running in ioctl context so we can avoid
- * the call to vtime_account() with its unnecessary idle check.
+ * This is running in ioctl context so its safe
+ * to assume that it's the stime pending cputime
+ * to flush.
*/
vtime_account_system(current);
current->flags |= PF_VCPU;
@@ -81,10 +82,7 @@ static inline void guest_enter(void)
static inline void guest_exit(void)
{
- /*
- * This is running in ioctl context so we can avoid
- * the call to vtime_account() with its unnecessary idle check.
- */
+ /* Flush the guest cputime we spent on the guest */
vtime_account_system(current);
current->flags &= ~PF_VCPU;
}