forked from Minki/linux
c8cd093a6e
Add hcall_entry and hcall_exit tracepoints. This replaces the inline assembly HCALL_STATS code and converts it to use the new tracepoints. To keep the disabled case as quick as possible, we embed a status word in the TOC so we can get at it with a single load. By doing so we keep the overhead at a minimum. Time taken for a null hcall: No tracepoint code: 135.79 cycles Disabled tracepoints: 137.95 cycles For reference, before this patch enabling HCALL_STATS resulted in a null hcall of 201.44 cycles! Signed-off-by: Anton Blanchard <anton@samba.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
133 lines
2.1 KiB
C
133 lines
2.1 KiB
C
#undef TRACE_SYSTEM
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#define TRACE_SYSTEM powerpc
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#if !defined(_TRACE_POWERPC_H) || defined(TRACE_HEADER_MULTI_READ)
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#define _TRACE_POWERPC_H
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#include <linux/tracepoint.h>
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struct pt_regs;
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TRACE_EVENT(irq_entry,
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TP_PROTO(struct pt_regs *regs),
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TP_ARGS(regs),
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TP_STRUCT__entry(
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__field(struct pt_regs *, regs)
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),
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TP_fast_assign(
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__entry->regs = regs;
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),
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TP_printk("pt_regs=%p", __entry->regs)
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);
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TRACE_EVENT(irq_exit,
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TP_PROTO(struct pt_regs *regs),
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TP_ARGS(regs),
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TP_STRUCT__entry(
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__field(struct pt_regs *, regs)
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),
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TP_fast_assign(
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__entry->regs = regs;
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),
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TP_printk("pt_regs=%p", __entry->regs)
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);
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TRACE_EVENT(timer_interrupt_entry,
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TP_PROTO(struct pt_regs *regs),
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TP_ARGS(regs),
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TP_STRUCT__entry(
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__field(struct pt_regs *, regs)
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),
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TP_fast_assign(
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__entry->regs = regs;
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),
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TP_printk("pt_regs=%p", __entry->regs)
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);
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TRACE_EVENT(timer_interrupt_exit,
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TP_PROTO(struct pt_regs *regs),
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TP_ARGS(regs),
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TP_STRUCT__entry(
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__field(struct pt_regs *, regs)
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),
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TP_fast_assign(
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__entry->regs = regs;
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),
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TP_printk("pt_regs=%p", __entry->regs)
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);
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#ifdef CONFIG_PPC_PSERIES
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extern void hcall_tracepoint_regfunc(void);
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extern void hcall_tracepoint_unregfunc(void);
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TRACE_EVENT_FN(hcall_entry,
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TP_PROTO(unsigned long opcode),
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TP_ARGS(opcode),
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TP_STRUCT__entry(
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__field(unsigned long, opcode)
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),
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TP_fast_assign(
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__entry->opcode = opcode;
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),
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TP_printk("opcode=%lu", __entry->opcode),
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hcall_tracepoint_regfunc, hcall_tracepoint_unregfunc
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);
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TRACE_EVENT_FN(hcall_exit,
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TP_PROTO(unsigned long opcode, unsigned long retval),
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TP_ARGS(opcode, retval),
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TP_STRUCT__entry(
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__field(unsigned long, opcode)
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__field(unsigned long, retval)
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),
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TP_fast_assign(
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__entry->opcode = opcode;
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__entry->retval = retval;
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),
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TP_printk("opcode=%lu retval=%lu", __entry->opcode, __entry->retval),
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hcall_tracepoint_regfunc, hcall_tracepoint_unregfunc
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);
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#endif
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#endif /* _TRACE_POWERPC_H */
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#undef TRACE_INCLUDE_PATH
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#undef TRACE_INCLUDE_FILE
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#define TRACE_INCLUDE_PATH asm
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#define TRACE_INCLUDE_FILE trace
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#include <trace/define_trace.h>
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