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author | Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com> | 2015-04-24 14:24:44 +0530 |
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committer | Michael Ellerman <mpe@ellerman.id.au> | 2015-08-06 16:36:23 +1000 |
commit | 197165d44925bd0fa892990851dee4d312a44b39 (patch) | |
tree | 5a3c35443e155b69a87456624ce458ee08a4ba08 /arch/powerpc/include/asm/trace_clock.h | |
parent | 35a7f41cc6bb7013e344502b03c5583d04228bd3 (diff) | |
download | op-kernel-dev-197165d44925bd0fa892990851dee4d312a44b39.zip op-kernel-dev-197165d44925bd0fa892990851dee4d312a44b39.tar.gz |
powerpc/ftrace: add powerpc timebase as a trace clock source
Add a new powerpc-specific trace clock using the timebase register,
similar to x86-tsc. This gives us
- a fast, monotonic, hardware clock source for trace entries, and
- a clock that can be used to correlate events across cpus as well as across
hypervisor and guests.
Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Acked-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/include/asm/trace_clock.h')
-rw-r--r-- | arch/powerpc/include/asm/trace_clock.h | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/trace_clock.h b/arch/powerpc/include/asm/trace_clock.h new file mode 100644 index 0000000..cf1ee75 --- /dev/null +++ b/arch/powerpc/include/asm/trace_clock.h @@ -0,0 +1,19 @@ +/* + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License, version 2, as + * published by the Free Software Foundation. + * + * Copyright (C) 2015 Naveen N. Rao, IBM Corporation + */ + +#ifndef _ASM_PPC_TRACE_CLOCK_H +#define _ASM_PPC_TRACE_CLOCK_H + +#include <linux/compiler.h> +#include <linux/types.h> + +extern u64 notrace trace_clock_ppc_tb(void); + +#define ARCH_TRACE_CLOCKS { trace_clock_ppc_tb, "ppc-tb", 0 }, + +#endif /* _ASM_PPC_TRACE_CLOCK_H */ |