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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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4ee7c60de8
Being able to trace the start and stop of initcalls is useful to see where the timings are an issue. There is already an "initcall_debug" parameter, but that can cause a large overhead itself, as the printing of the information may take longer than the initcall functions. Adding in a start and finish trace event around the initcall functions, as well as a trace event that records the level of the initcalls, one can get a much finer measurement of the times and interactions of the initcalls themselves, as trace events are much lighter than printk()s. Suggested-by: Abderrahmane Benbachir <abderrahmane.benbachir@polymtl.ca> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
67 lines
1.1 KiB
C
67 lines
1.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#undef TRACE_SYSTEM
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#define TRACE_SYSTEM initcall
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#if !defined(_TRACE_INITCALL_H) || defined(TRACE_HEADER_MULTI_READ)
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#define _TRACE_INITCALL_H
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#include <linux/tracepoint.h>
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TRACE_EVENT(initcall_level,
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TP_PROTO(const char *level),
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TP_ARGS(level),
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TP_STRUCT__entry(
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__string(level, level)
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),
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TP_fast_assign(
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__assign_str(level, level);
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),
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TP_printk("level=%s", __get_str(level))
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);
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TRACE_EVENT(initcall_start,
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TP_PROTO(initcall_t func),
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TP_ARGS(func),
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TP_STRUCT__entry(
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__field(initcall_t, func)
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),
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TP_fast_assign(
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__entry->func = func;
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),
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TP_printk("func=%pS", __entry->func)
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);
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TRACE_EVENT(initcall_finish,
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TP_PROTO(initcall_t func, int ret),
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TP_ARGS(func, ret),
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TP_STRUCT__entry(
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__field(initcall_t, func)
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__field(int, ret)
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),
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TP_fast_assign(
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__entry->func = func;
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__entry->ret = ret;
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),
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TP_printk("func=%pS ret=%d", __entry->func, __entry->ret)
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);
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#endif /* if !defined(_TRACE_GPIO_H) || defined(TRACE_HEADER_MULTI_READ) */
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/* This part must be outside protection */
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#include <trace/define_trace.h>
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