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Subject[PATCH 3/5] rcu,nohz: run vtime_user_enter/exit only when state == IN_USER
Date
From: Rik van Riel <riel@redhat.com>

Only run vtime_user_enter, vtime_user_exit, and the user enter & exit
trace points when we are entering or exiting user state, respectively.

The KVM code in guest_enter and guest_exit already take care of calling
vtime_guest_enter and vtime_guest_exit, respectively.

The RCU code only distinguishes between "idle" and "not idle or kernel".
There should be no need to add an additional (unused) state there.

Signed-off-by: Rik van Riel <riel@redhat.com>
---
kernel/context_tracking.c | 12 ++++++++----
1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/kernel/context_tracking.c b/kernel/context_tracking.c
index 38e38aeac8b9..0e4e318d5ea4 100644
--- a/kernel/context_tracking.c
+++ b/kernel/context_tracking.c
@@ -77,7 +77,6 @@ void context_tracking_enter(enum ctx_state state)
local_irq_save(flags);
if ( __this_cpu_read(context_tracking.state) != state) {
if (__this_cpu_read(context_tracking.active)) {
- trace_user_enter(0);
/*
* At this stage, only low level arch entry code remains and
* then we'll run in userspace. We can assume there won't be
@@ -85,7 +84,10 @@ void context_tracking_enter(enum ctx_state state)
* user_exit() or rcu_irq_enter(). Let's remove RCU's dependency
* on the tick.
*/
- vtime_user_enter(current);
+ if (state == IN_USER) {
+ trace_user_enter(0);
+ vtime_user_enter(current);
+ }
rcu_user_enter();
}
/*
@@ -143,8 +145,10 @@ void context_tracking_exit(enum ctx_state state)
* RCU core about that (ie: we may need the tick again).
*/
rcu_user_exit();
- vtime_user_exit(current);
- trace_user_exit(0);
+ if (state == IN_USER) {
+ vtime_user_exit(current);
+ trace_user_exit(0);
+ }
}
__this_cpu_write(context_tracking.state, IN_KERNEL);
}
--
1.9.3


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