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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-24 02:35:16 +07:00
a4a551b8f1
Currently ftrace_graph_ent{,_entry} and ftrace_graph_ret{,_entry} struct
can have padding bytes at the end due to alignment in 64-bit data type.
As these data are recorded so frequently, those paddings waste
non-negligible space. As the ring buffer maintains alignment properly
for each architecture, just to remove the extra padding using 'packed'
attribute.
ftrace_graph_ent_entry: 24 -> 20
ftrace_graph_ret_entry: 48 -> 44
Also I moved the 'overrun' field in struct ftrace_graph_ret to minimize
the padding in the middle.
Tested on x86_64 only.
Link: http://lkml.kernel.org/r/1467197808-13578-1-git-send-email-namhyung@kernel.org
Cc: Ingo Molnar <mingo@kernel.org>
Cc: linux-arch@vger.kernel.org
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
325 lines
7.4 KiB
C
325 lines
7.4 KiB
C
/*
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* This file defines the trace event structures that go into the ring
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* buffer directly. They are created via macros so that changes for them
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* appear in the format file. Using macros will automate this process.
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*
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* The macro used to create a ftrace data structure is:
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*
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* FTRACE_ENTRY( name, struct_name, id, structure, print )
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*
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* @name: the name used the event name, as well as the name of
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* the directory that holds the format file.
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*
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* @struct_name: the name of the structure that is created.
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*
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* @id: The event identifier that is used to detect what event
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* this is from the ring buffer.
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*
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* @structure: the structure layout
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*
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* - __field( type, item )
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* This is equivalent to declaring
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* type item;
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* in the structure.
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* - __array( type, item, size )
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* This is equivalent to declaring
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* type item[size];
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* in the structure.
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*
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* * for structures within structures, the format of the internal
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* structure is laid out. This allows the internal structure
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* to be deciphered for the format file. Although these macros
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* may become out of sync with the internal structure, they
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* will create a compile error if it happens. Since the
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* internel structures are just tracing helpers, this is not
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* an issue.
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*
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* When an internal structure is used, it should use:
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*
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* __field_struct( type, item )
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*
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* instead of __field. This will prevent it from being shown in
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* the output file. The fields in the structure should use.
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*
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* __field_desc( type, container, item )
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* __array_desc( type, container, item, len )
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*
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* type, item and len are the same as __field and __array, but
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* container is added. This is the name of the item in
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* __field_struct that this is describing.
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*
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*
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* @print: the print format shown to users in the format file.
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*/
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/*
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* Function trace entry - function address and parent function address:
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*/
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FTRACE_ENTRY_REG(function, ftrace_entry,
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TRACE_FN,
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F_STRUCT(
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__field( unsigned long, ip )
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__field( unsigned long, parent_ip )
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),
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F_printk(" %lx <-- %lx", __entry->ip, __entry->parent_ip),
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FILTER_TRACE_FN,
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perf_ftrace_event_register
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);
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/* Function call entry */
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FTRACE_ENTRY_PACKED(funcgraph_entry, ftrace_graph_ent_entry,
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TRACE_GRAPH_ENT,
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F_STRUCT(
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__field_struct( struct ftrace_graph_ent, graph_ent )
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__field_desc( unsigned long, graph_ent, func )
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__field_desc( int, graph_ent, depth )
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),
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F_printk("--> %lx (%d)", __entry->func, __entry->depth),
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FILTER_OTHER
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);
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/* Function return entry */
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FTRACE_ENTRY_PACKED(funcgraph_exit, ftrace_graph_ret_entry,
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TRACE_GRAPH_RET,
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F_STRUCT(
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__field_struct( struct ftrace_graph_ret, ret )
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__field_desc( unsigned long, ret, func )
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__field_desc( unsigned long long, ret, calltime)
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__field_desc( unsigned long long, ret, rettime )
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__field_desc( unsigned long, ret, overrun )
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__field_desc( int, ret, depth )
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),
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F_printk("<-- %lx (%d) (start: %llx end: %llx) over: %d",
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__entry->func, __entry->depth,
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__entry->calltime, __entry->rettime,
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__entry->depth),
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FILTER_OTHER
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);
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/*
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* Context switch trace entry - which task (and prio) we switched from/to:
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*
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* This is used for both wakeup and context switches. We only want
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* to create one structure, but we need two outputs for it.
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*/
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#define FTRACE_CTX_FIELDS \
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__field( unsigned int, prev_pid ) \
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__field( unsigned int, next_pid ) \
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__field( unsigned int, next_cpu ) \
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__field( unsigned char, prev_prio ) \
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__field( unsigned char, prev_state ) \
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__field( unsigned char, next_prio ) \
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__field( unsigned char, next_state )
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FTRACE_ENTRY(context_switch, ctx_switch_entry,
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TRACE_CTX,
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F_STRUCT(
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FTRACE_CTX_FIELDS
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),
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F_printk("%u:%u:%u ==> %u:%u:%u [%03u]",
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__entry->prev_pid, __entry->prev_prio, __entry->prev_state,
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__entry->next_pid, __entry->next_prio, __entry->next_state,
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__entry->next_cpu),
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FILTER_OTHER
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);
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/*
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* FTRACE_ENTRY_DUP only creates the format file, it will not
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* create another structure.
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*/
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FTRACE_ENTRY_DUP(wakeup, ctx_switch_entry,
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TRACE_WAKE,
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F_STRUCT(
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FTRACE_CTX_FIELDS
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),
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F_printk("%u:%u:%u ==+ %u:%u:%u [%03u]",
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__entry->prev_pid, __entry->prev_prio, __entry->prev_state,
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__entry->next_pid, __entry->next_prio, __entry->next_state,
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__entry->next_cpu),
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FILTER_OTHER
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);
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/*
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* Stack-trace entry:
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*/
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#define FTRACE_STACK_ENTRIES 8
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#ifndef CONFIG_64BIT
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# define IP_FMT "%08lx"
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#else
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# define IP_FMT "%016lx"
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#endif
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FTRACE_ENTRY(kernel_stack, stack_entry,
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TRACE_STACK,
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F_STRUCT(
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__field( int, size )
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__dynamic_array(unsigned long, caller )
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),
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F_printk("\t=> (" IP_FMT ")\n\t=> (" IP_FMT ")\n\t=> (" IP_FMT ")\n"
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"\t=> (" IP_FMT ")\n\t=> (" IP_FMT ")\n\t=> (" IP_FMT ")\n"
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"\t=> (" IP_FMT ")\n\t=> (" IP_FMT ")\n",
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__entry->caller[0], __entry->caller[1], __entry->caller[2],
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__entry->caller[3], __entry->caller[4], __entry->caller[5],
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__entry->caller[6], __entry->caller[7]),
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FILTER_OTHER
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);
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FTRACE_ENTRY(user_stack, userstack_entry,
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TRACE_USER_STACK,
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F_STRUCT(
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__field( unsigned int, tgid )
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__array( unsigned long, caller, FTRACE_STACK_ENTRIES )
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),
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F_printk("\t=> (" IP_FMT ")\n\t=> (" IP_FMT ")\n\t=> (" IP_FMT ")\n"
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"\t=> (" IP_FMT ")\n\t=> (" IP_FMT ")\n\t=> (" IP_FMT ")\n"
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"\t=> (" IP_FMT ")\n\t=> (" IP_FMT ")\n",
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__entry->caller[0], __entry->caller[1], __entry->caller[2],
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__entry->caller[3], __entry->caller[4], __entry->caller[5],
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__entry->caller[6], __entry->caller[7]),
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FILTER_OTHER
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);
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/*
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* trace_printk entry:
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*/
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FTRACE_ENTRY(bprint, bprint_entry,
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TRACE_BPRINT,
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F_STRUCT(
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__field( unsigned long, ip )
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__field( const char *, fmt )
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__dynamic_array( u32, buf )
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),
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F_printk("%ps: %s",
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(void *)__entry->ip, __entry->fmt),
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FILTER_OTHER
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);
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FTRACE_ENTRY(print, print_entry,
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TRACE_PRINT,
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F_STRUCT(
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__field( unsigned long, ip )
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__dynamic_array( char, buf )
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),
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F_printk("%ps: %s",
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(void *)__entry->ip, __entry->buf),
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FILTER_OTHER
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);
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FTRACE_ENTRY(bputs, bputs_entry,
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TRACE_BPUTS,
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F_STRUCT(
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__field( unsigned long, ip )
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__field( const char *, str )
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),
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F_printk("%ps: %s",
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(void *)__entry->ip, __entry->str),
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FILTER_OTHER
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);
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FTRACE_ENTRY(mmiotrace_rw, trace_mmiotrace_rw,
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TRACE_MMIO_RW,
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F_STRUCT(
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__field_struct( struct mmiotrace_rw, rw )
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__field_desc( resource_size_t, rw, phys )
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__field_desc( unsigned long, rw, value )
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__field_desc( unsigned long, rw, pc )
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__field_desc( int, rw, map_id )
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__field_desc( unsigned char, rw, opcode )
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__field_desc( unsigned char, rw, width )
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),
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F_printk("%lx %lx %lx %d %x %x",
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(unsigned long)__entry->phys, __entry->value, __entry->pc,
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__entry->map_id, __entry->opcode, __entry->width),
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FILTER_OTHER
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);
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FTRACE_ENTRY(mmiotrace_map, trace_mmiotrace_map,
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TRACE_MMIO_MAP,
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F_STRUCT(
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__field_struct( struct mmiotrace_map, map )
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__field_desc( resource_size_t, map, phys )
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__field_desc( unsigned long, map, virt )
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__field_desc( unsigned long, map, len )
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__field_desc( int, map, map_id )
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__field_desc( unsigned char, map, opcode )
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),
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F_printk("%lx %lx %lx %d %x",
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(unsigned long)__entry->phys, __entry->virt, __entry->len,
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__entry->map_id, __entry->opcode),
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FILTER_OTHER
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);
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#define TRACE_FUNC_SIZE 30
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#define TRACE_FILE_SIZE 20
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FTRACE_ENTRY(branch, trace_branch,
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TRACE_BRANCH,
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F_STRUCT(
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__field( unsigned int, line )
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__array( char, func, TRACE_FUNC_SIZE+1 )
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__array( char, file, TRACE_FILE_SIZE+1 )
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__field( char, correct )
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),
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F_printk("%u:%s:%s (%u)",
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__entry->line,
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__entry->func, __entry->file, __entry->correct),
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FILTER_OTHER
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);
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