mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2025-04-12 16:47:42 +00:00
Code Issues Packages Projects Releases Wiki Activity
linux/kernel/trace/trace_entries.h
Steven Rostedt 66611c0475 fgraph: Remove calltime and rettime from generic operations 
The function graph infrastructure is now generic so that kretprobes,
fprobes and BPF can use it. But there is still some leftover logic that
only the function graph tracer itself uses. This is the calculation of the
calltime and return time of the functions. The calculation of the calltime
has been moved into the function graph tracer and those users that need it
so that it doesn't cause overhead to the other users. But the return
function timestamp was still called.

Instead of just moving the taking of the timestamp into the function graph
trace remove the calltime and rettime completely from the ftrace_graph_ret
structure. Instead, move it into the function graph return entry event
structure and this also moves all the calltime and rettime logic out of
the generic fgraph.c code and into the tracing code that uses it.

This has been reported to decrease the overhead by ~27%.

Link: https://lore.kernel.org/all/Z3aSuql3fnXMVMoM@krava/
Link: https://lore.kernel.org/all/173665959558.1629214.16724136597211810729.stgit@devnote2/

Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Link: https://lore.kernel.org/20250121194436.15bdf71a@gandalf.local.home
Reported-by: Jiri Olsa <olsajiri@gmail.com>
Reviewed-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
2025-01-21 21:55:49 -05:00

457 lines
11 KiB
C
Raw Blame History

// SPDX-License-Identifier: GPL-2.0
/*
* This file defines the trace event structures that go into the ring
* buffer directly. They are created via macros so that changes for them
* appear in the format file. Using macros will automate this process.
*
* The macro used to create a ftrace data structure is:
*
* FTRACE_ENTRY( name, struct_name, id, structure, print )
*
* @name: the name used the event name, as well as the name of
* the directory that holds the format file.
*
* @struct_name: the name of the structure that is created.
*
* @id: The event identifier that is used to detect what event
* this is from the ring buffer.
*
* @structure: the structure layout
*
* - __field( type, item )
* This is equivalent to declaring
* type item;
* in the structure.
* - __array( type, item, size )
* This is equivalent to declaring
* type item[size];
* in the structure.
*
* * for structures within structures, the format of the internal
* structure is laid out. This allows the internal structure
* to be deciphered for the format file. Although these macros
* may become out of sync with the internal structure, they
* will create a compile error if it happens. Since the
* internal structures are just tracing helpers, this is not
* an issue.
*
* When an internal structure is used, it should use:
*
* __field_struct( type, item )
*
* instead of __field. This will prevent it from being shown in
* the output file. The fields in the structure should use.
*
* __field_desc( type, container, item )
* __array_desc( type, container, item, len )
*
* type, item and len are the same as __field and __array, but
* container is added. This is the name of the item in
* __field_struct that this is describing.
*
*
* @print: the print format shown to users in the format file.
*/
/*
* Function trace entry - function address and parent function address:
*/
FTRACE_ENTRY_REG(function, ftrace_entry,
TRACE_FN,
F_STRUCT(
__field_fn( unsigned long, ip )
__field_fn( unsigned long, parent_ip )
),
F_printk(" %ps <-- %ps",
(void *)__entry->ip, (void *)__entry->parent_ip),
perf_ftrace_event_register
);
/* Function call entry */
FTRACE_ENTRY_PACKED(funcgraph_entry, ftrace_graph_ent_entry,
TRACE_GRAPH_ENT,
F_STRUCT(
__field_struct( struct ftrace_graph_ent, graph_ent )
__field_packed( unsigned long, graph_ent, func )
__field_packed( int, graph_ent, depth )
),
F_printk("--> %ps (%d)", (void *)__entry->func, __entry->depth)
);
#ifdef CONFIG_FUNCTION_GRAPH_RETADDR
/* Function call entry with a return address */
FTRACE_ENTRY_PACKED(fgraph_retaddr_entry, fgraph_retaddr_ent_entry,
TRACE_GRAPH_RETADDR_ENT,
F_STRUCT(
__field_struct( struct fgraph_retaddr_ent, graph_ent )
__field_packed( unsigned long, graph_ent, func )
__field_packed( int, graph_ent, depth )
__field_packed( unsigned long, graph_ent, retaddr )
),
F_printk("--> %ps (%d) <- %ps", (void *)__entry->func, __entry->depth,
(void *)__entry->retaddr)
);
#else
#ifndef fgraph_retaddr_ent_entry
#define fgraph_retaddr_ent_entry ftrace_graph_ent_entry
#endif
#endif
#ifdef CONFIG_FUNCTION_GRAPH_RETVAL
/* Function return entry */
FTRACE_ENTRY_PACKED(funcgraph_exit, ftrace_graph_ret_entry,
TRACE_GRAPH_RET,
F_STRUCT(
__field_struct( struct ftrace_graph_ret, ret )
__field_packed( unsigned long, ret, func )
__field_packed( unsigned long, ret, retval )
__field_packed( int, ret, depth )
__field_packed( unsigned int, ret, overrun )
__field(unsigned long long, calltime )
__field(unsigned long long, rettime )
),
F_printk("<-- %ps (%d) (start: %llx end: %llx) over: %d retval: %lx",
(void *)__entry->func, __entry->depth,
__entry->calltime, __entry->rettime,
__entry->depth, __entry->retval)
);
#else
/* Function return entry */
FTRACE_ENTRY_PACKED(funcgraph_exit, ftrace_graph_ret_entry,
TRACE_GRAPH_RET,
F_STRUCT(
__field_struct( struct ftrace_graph_ret, ret )
__field_packed( unsigned long, ret, func )
__field_packed( int, ret, depth )
__field_packed( unsigned int, ret, overrun )
__field(unsigned long long, calltime )
__field(unsigned long long, rettime )
),
F_printk("<-- %ps (%d) (start: %llx end: %llx) over: %d",
(void *)__entry->func, __entry->depth,
__entry->calltime, __entry->rettime,
__entry->depth)
);
#endif
/*
* Context switch trace entry - which task (and prio) we switched from/to:
*
* This is used for both wakeup and context switches. We only want
* to create one structure, but we need two outputs for it.
*/
#define FTRACE_CTX_FIELDS \
__field( unsigned int, prev_pid ) \
__field( unsigned int, next_pid ) \
__field( unsigned int, next_cpu ) \
__field( unsigned char, prev_prio ) \
__field( unsigned char, prev_state ) \
__field( unsigned char, next_prio ) \
__field( unsigned char, next_state )
FTRACE_ENTRY(context_switch, ctx_switch_entry,
TRACE_CTX,
F_STRUCT(
FTRACE_CTX_FIELDS
),
F_printk("%u:%u:%u ==> %u:%u:%u [%03u]",
__entry->prev_pid, __entry->prev_prio, __entry->prev_state,
__entry->next_pid, __entry->next_prio, __entry->next_state,
__entry->next_cpu)
);
/*
* FTRACE_ENTRY_DUP only creates the format file, it will not
* create another structure.
*/
FTRACE_ENTRY_DUP(wakeup, ctx_switch_entry,
TRACE_WAKE,
F_STRUCT(
FTRACE_CTX_FIELDS
),
F_printk("%u:%u:%u ==+ %u:%u:%u [%03u]",
__entry->prev_pid, __entry->prev_prio, __entry->prev_state,
__entry->next_pid, __entry->next_prio, __entry->next_state,
__entry->next_cpu)
);
/*
* Stack-trace entry:
*/
#define FTRACE_STACK_ENTRIES 8
FTRACE_ENTRY(kernel_stack, stack_entry,
TRACE_STACK,
F_STRUCT(
__field( int, size )
__stack_array( unsigned long, caller, FTRACE_STACK_ENTRIES, size)
),
F_printk("\t=> %ps\n\t=> %ps\n\t=> %ps\n"
"\t=> %ps\n\t=> %ps\n\t=> %ps\n"
"\t=> %ps\n\t=> %ps\n",
(void *)__entry->caller[0], (void *)__entry->caller[1],
(void *)__entry->caller[2], (void *)__entry->caller[3],
(void *)__entry->caller[4], (void *)__entry->caller[5],
(void *)__entry->caller[6], (void *)__entry->caller[7])
);
FTRACE_ENTRY(user_stack, userstack_entry,
TRACE_USER_STACK,
F_STRUCT(
__field( unsigned int, tgid )
__array( unsigned long, caller, FTRACE_STACK_ENTRIES )
),
F_printk("\t=> %ps\n\t=> %ps\n\t=> %ps\n"
"\t=> %ps\n\t=> %ps\n\t=> %ps\n"
"\t=> %ps\n\t=> %ps\n",
(void *)__entry->caller[0], (void *)__entry->caller[1],
(void *)__entry->caller[2], (void *)__entry->caller[3],
(void *)__entry->caller[4], (void *)__entry->caller[5],
(void *)__entry->caller[6], (void *)__entry->caller[7])
);
/*
* trace_printk entry:
*/
FTRACE_ENTRY(bprint, bprint_entry,
TRACE_BPRINT,
F_STRUCT(
__field( unsigned long, ip )
__field( const char *, fmt )
__dynamic_array( u32, buf )
),
F_printk("%ps: %s",
(void *)__entry->ip, __entry->fmt)
);
FTRACE_ENTRY_REG(print, print_entry,
TRACE_PRINT,
F_STRUCT(
__field( unsigned long, ip )
__dynamic_array( char, buf )
),
F_printk("%ps: %s",
(void *)__entry->ip, __entry->buf),
ftrace_event_register
);
FTRACE_ENTRY(raw_data, raw_data_entry,
TRACE_RAW_DATA,
F_STRUCT(
__field( unsigned int, id )
__dynamic_array( char, buf )
),
F_printk("id:%04x %08x",
__entry->id, (int)__entry->buf[0])
);
FTRACE_ENTRY(bputs, bputs_entry,
TRACE_BPUTS,
F_STRUCT(
__field( unsigned long, ip )
__field( const char *, str )
),
F_printk("%ps: %s",
(void *)__entry->ip, __entry->str)
);
FTRACE_ENTRY(mmiotrace_rw, trace_mmiotrace_rw,
TRACE_MMIO_RW,
F_STRUCT(
__field_struct( struct mmiotrace_rw, rw )
__field_desc( resource_size_t, rw, phys )
__field_desc( unsigned long, rw, value )
__field_desc( unsigned long, rw, pc )
__field_desc( int, rw, map_id )
__field_desc( unsigned char, rw, opcode )
__field_desc( unsigned char, rw, width )
),
F_printk("%lx %lx %lx %d %x %x",
(unsigned long)__entry->phys, __entry->value, __entry->pc,
__entry->map_id, __entry->opcode, __entry->width)
);
FTRACE_ENTRY(mmiotrace_map, trace_mmiotrace_map,
TRACE_MMIO_MAP,
F_STRUCT(
__field_struct( struct mmiotrace_map, map )
__field_desc( resource_size_t, map, phys )
__field_desc( unsigned long, map, virt )
__field_desc( unsigned long, map, len )
__field_desc( int, map, map_id )
__field_desc( unsigned char, map, opcode )
),
F_printk("%lx %lx %lx %d %x",
(unsigned long)__entry->phys, __entry->virt, __entry->len,
__entry->map_id, __entry->opcode)
);
#define TRACE_FUNC_SIZE 30
#define TRACE_FILE_SIZE 20
FTRACE_ENTRY(branch, trace_branch,
TRACE_BRANCH,
F_STRUCT(
__field( unsigned int, line )
__array( char, func, TRACE_FUNC_SIZE+1 )
__array( char, file, TRACE_FILE_SIZE+1 )
__field( char, correct )
__field( char, constant )
),
F_printk("%u:%s:%s (%u)%s",
__entry->line,
__entry->func, __entry->file, __entry->correct,
__entry->constant ? " CONSTANT" : "")
);
FTRACE_ENTRY(hwlat, hwlat_entry,
TRACE_HWLAT,
F_STRUCT(
__field( u64, duration )
__field( u64, outer_duration )
__field( u64, nmi_total_ts )
__field_struct( struct timespec64, timestamp )
__field_desc( s64, timestamp, tv_sec )
__field_desc( long, timestamp, tv_nsec )
__field( unsigned int, nmi_count )
__field( unsigned int, seqnum )
__field( unsigned int, count )
),
F_printk("cnt:%u\tts:%010llu.%010lu\tinner:%llu\touter:%llu\tcount:%d\tnmi-ts:%llu\tnmi-count:%u\n",
__entry->seqnum,
__entry->tv_sec,
__entry->tv_nsec,
__entry->duration,
__entry->outer_duration,
__entry->count,
__entry->nmi_total_ts,
__entry->nmi_count)
);
#define FUNC_REPEATS_GET_DELTA_TS(entry) \
(((u64)(entry)->top_delta_ts << 32) | (entry)->bottom_delta_ts) \
FTRACE_ENTRY(func_repeats, func_repeats_entry,
TRACE_FUNC_REPEATS,
F_STRUCT(
__field( unsigned long, ip )
__field( unsigned long, parent_ip )
__field( u16 , count )
__field( u16 , top_delta_ts )
__field( u32 , bottom_delta_ts )
),
F_printk(" %ps <-%ps\t(repeats:%u delta: -%llu)",
(void *)__entry->ip,
(void *)__entry->parent_ip,
__entry->count,
FUNC_REPEATS_GET_DELTA_TS(__entry))
);
FTRACE_ENTRY(osnoise, osnoise_entry,
TRACE_OSNOISE,
F_STRUCT(
__field( u64, noise )
__field( u64, runtime )
__field( u64, max_sample )
__field( unsigned int, hw_count )
__field( unsigned int, nmi_count )
__field( unsigned int, irq_count )
__field( unsigned int, softirq_count )
__field( unsigned int, thread_count )
),
F_printk("noise:%llu\tmax_sample:%llu\thw:%u\tnmi:%u\tirq:%u\tsoftirq:%u\tthread:%u\n",
__entry->noise,
__entry->max_sample,
__entry->hw_count,
__entry->nmi_count,
__entry->irq_count,
__entry->softirq_count,
__entry->thread_count)
);
FTRACE_ENTRY(timerlat, timerlat_entry,
TRACE_TIMERLAT,
F_STRUCT(
__field( unsigned int, seqnum )
__field( int, context )
__field( u64, timer_latency )
),
F_printk("seq:%u\tcontext:%d\ttimer_latency:%llu\n",
__entry->seqnum,
__entry->context,
__entry->timer_latency)
);
Reference in New Issue View Git Blame Copy Permalink