Commit 40565b5a authored by Stanislaw Gruszka's avatar Stanislaw Gruszka Committed by Ingo Molnar
Browse files

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: default avatarStanislaw Gruszka <sgruszka@redhat.com>
Signed-off-by: default avatarFrederic 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: default avatarIngo Molnar <mingo@kernel.org>
parent 981ee2d4

arch/Kconfig

+3 −0
Original line number Diff line number Diff line
@@ -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

arch/ia64/kernel/time.c

+2 −2
Original line number Diff line number Diff line
@@ -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);

arch/powerpc/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -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

arch/powerpc/kernel/time.c

+4 −2
Original line number Diff line number Diff line
@@ -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

arch/s390/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -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

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