sched/cputime, powerpc, s390: Make scaled cputime arch specific

Only s390 and powerpc have hardware facilities allowing to measure
cputimes scaled by frequency. On all other architectures
utimescaled/stimescaled are equal to utime/stime (however they are
accounted separately).

Remove {u,s}timescaled accounting on all architectures except
powerpc and s390, where those values are explicitly accounted
in the proper places.

Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Michael Neuling <mikey@neuling.org>
Cc: Paul Mackerras <paulus@ozlabs.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20161031162143.GB12646@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

6 files changed, 17 insertions, 7 deletions

diff --git a/arch/Kconfig b/arch/Kconfig
index 659bdd079277..abab6590f08f 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -512,6 +512,9 @@ config HAVE_CONTEXT_TRACKING
 config HAVE_VIRT_CPU_ACCOUNTING
 	bool
 
+config ARCH_HAS_SCALED_CPUTIME
+	bool
+
 config HAVE_VIRT_CPU_ACCOUNTING_GEN
 	bool
 	default y if 64BIT
diff --git a/arch/ia64/kernel/time.c b/arch/ia64/kernel/time.c
index 6f892b94e906..021f44ab4bfb 100644
--- a/arch/ia64/kernel/time.c
+++ b/arch/ia64/kernel/time.c
@@ -68,7 +68,7 @@ void vtime_account_user(struct task_struct *tsk)
 
 	if (ti->ac_utime) {
 		delta_utime = cycle_to_cputime(ti->ac_utime);
-		account_user_time(tsk, delta_utime, delta_utime);
+		account_user_time(tsk, delta_utime);
 		ti->ac_utime = 0;
 	}
 }
@@ -112,7 +112,7 @@ void vtime_account_system(struct task_struct *tsk)
 {
 	cputime_t delta = vtime_delta(tsk);
 
-	account_system_time(tsk, 0, delta, delta);
+	account_system_time(tsk, 0, delta);
 }
 EXPORT_SYMBOL_GPL(vtime_account_system);
 
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 65fba4c34cd7..c7f120aaa98f 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -160,6 +160,7 @@ config PPC
 	select HAVE_LIVEPATCH if HAVE_DYNAMIC_FTRACE_WITH_REGS
 	select GENERIC_CPU_AUTOPROBE
 	select HAVE_VIRT_CPU_ACCOUNTING
+	select ARCH_HAS_SCALED_CPUTIME if VIRT_CPU_ACCOUNTING_NATIVE
 	select HAVE_ARCH_HARDENED_USERCOPY
 	select HAVE_KERNEL_GZIP
 
diff --git a/arch/powerpc/kernel/time.c b/arch/powerpc/kernel/time.c
index 81051986739c..be9751f1cb2a 100644
--- a/arch/powerpc/kernel/time.c
+++ b/arch/powerpc/kernel/time.c
@@ -358,7 +358,8 @@ void vtime_account_system(struct task_struct *tsk)
 	unsigned long delta, sys_scaled, stolen;
 
 	delta = vtime_delta(tsk, &sys_scaled, &stolen);
-	account_system_time(tsk, 0, delta, sys_scaled);
+	account_system_time(tsk, 0, delta);
+	tsk->stimescaled += sys_scaled;
 	if (stolen)
 		account_steal_time(stolen);
 }
@@ -391,7 +392,8 @@ void vtime_account_user(struct task_struct *tsk)
 	acct->user_time = 0;
 	acct->user_time_scaled = 0;
 	acct->utime_sspurr = 0;
-	account_user_time(tsk, utime, utimescaled);
+	account_user_time(tsk, utime);
+	tsk->utimescaled += utimescaled;
 }
 
 #ifdef CONFIG_PPC32
diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
index 426481d4cc86..028f97be5bae 100644
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -171,6 +171,7 @@ config S390
 	select SYSCTL_EXCEPTION_TRACE
 	select TTY
 	select VIRT_CPU_ACCOUNTING
+	select ARCH_HAS_SCALED_CPUTIME
 	select VIRT_TO_BUS
 	select HAVE_NMI
 
diff --git a/arch/s390/kernel/vtime.c b/arch/s390/kernel/vtime.c
index 856e30d8463f..1bd5dde2d5a9 100644
--- a/arch/s390/kernel/vtime.c
+++ b/arch/s390/kernel/vtime.c
@@ -137,8 +137,10 @@ static int do_account_vtime(struct task_struct *tsk, int hardirq_offset)
 		user_scaled = (user_scaled * mult) / div;
 		system_scaled = (system_scaled * mult) / div;
 	}
-	account_user_time(tsk, user, user_scaled);
-	account_system_time(tsk, hardirq_offset, system, system_scaled);
+	account_user_time(tsk, user);
+	tsk->utimescaled += user_scaled;
+	account_system_time(tsk, hardirq_offset, system);
+	tsk->stimescaled += system_scaled;
 
 	steal = S390_lowcore.steal_timer;
 	if ((s64) steal > 0) {
@@ -202,7 +204,8 @@ void vtime_account_irq_enter(struct task_struct *tsk)
 
 		system_scaled = (system_scaled * mult) / div;
 	}
-	account_system_time(tsk, 0, system, system_scaled);
+	account_system_time(tsk, 0, system);
+	tsk->stimescaled += system_scaled;
 
 	virt_timer_forward(system);
 }