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arm: introduce CONFIG_PARAVIRT, PARAVIRT_TIME_ACCOUNTING and pv_time_ops

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Introduce CONFIG_PARAVIRT and PARAVIRT_TIME_ACCOUNTING on ARM.

The only paravirt interface supported is pv_time_ops.steal_clock, so no
runtime pvops patching needed.

This allows us to make use of steal_account_process_tick for stolen
ticks accounting.

Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Acked-by: Christopher Covington <cov@codeaurora.org>
Acked-by: Ian Campbell <ian.campbell@citrix.com>
Acked-by: Russell King <linux@arm.linux.org.uk>
This commit is contained in:
Stefano Stabellini 2015-11-23 10:32:57 +00:00 • committed by David Vrabel
parent 1fe7c4ef88
commit 02c2433b3a
4 changed files with 66 additions and 0 deletions
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20
arch/arm/include/asm/paravirt.h Normal file
View file

@ -0,0 +1,20 @@
#ifndef _ASM_ARM_PARAVIRT_H
#define _ASM_ARM_PARAVIRT_H
#ifdef CONFIG_PARAVIRT
struct static_key;
extern struct static_key paravirt_steal_enabled;
extern struct static_key paravirt_steal_rq_enabled;
struct pv_time_ops {
unsigned long long (*steal_clock)(int cpu);
};
extern struct pv_time_ops pv_time_ops;
static inline u64 paravirt_steal_clock(int cpu)
{
return pv_time_ops.steal_clock(cpu);
}
#endif
#endif