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Date: Wed, 9 Mar 2016 09:56:56 +0900 From: Taeung Song <treeze.taeung@...il.com> To: Steven Rostedt <rostedt@...dmis.org>, Arnaldo Carvalho de Melo <arnaldo.melo@...il.com> Cc: Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org, Jiri Olsa <jolsa@...nel.org>, Namhyung Kim <namhyung@...nel.org>, Thomas Gleixner <tglx@...utronix.de>, Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>, Lai Jiangshan <jiangshanlai@...il.com> Subject: Re: [RFC][PATCH v4 1/2] tracing/syscalls: Rename a field 'nr' to '__syscall_nr' in format Hi, Steven and Arnaldo Oh.. Arnaldo already replied :-) Thank you, Taeung On 03/09/2016 04:32 AM, Arnaldo Carvalho de Melo wrote: > Em Tue, Mar 08, 2016 at 04:32:12PM -0300, Arnaldo Carvalho de Melo escreveu: >> Em Tue, Mar 08, 2016 at 02:24:34PM -0500, Steven Rostedt escreveu: >>> On Sun, 28 Feb 2016 01:41:51 +0900 >>> Taeung Song <treeze.taeung@...il.com> wrote: >>> >>> >>> Have we decided what we are going to do with this patch? Pull it as is >>> and see what the fall out is? >> >> That was my understanding, you said somewhere that I could add your >> signed-off-by, lemme dig that message... > > And this is even already in tip/perf/core > >>> Was there a perf patch with this too? >> >> Yes: >> >> commit c42de706dad3f39c1f65e473a1d165ea33f8b6e8 >> Author: Taeung Song <treeze.taeung@...il.com> >> Date: Fri Feb 26 22:14:25 2016 +0900 >> >> perf trace: Check and discard not only 'nr' but also '__syscall_nr' >> >>> -- Steve >>> >>>> Some syscalls tracepoint duplicated fields with the same name 'nr' i.e. >>>> >>>> # cat /sys/kernel/debug/tracing/events/syscalls/sys_enter_io_getevents/format >>>> name: sys_enter_io_getevents >>>> ID: 739 >>>> format: >>>> field:unsigned short common_type; offset:0; size:2; signed:0; >>>> field:unsigned char common_flags; offset:2; size:1; signed:0; >>>> field:unsigned char common_preempt_count; offset:3; size:1; signed:0; >>>> field:int common_pid;offset:4;size:4;signed:1; >>>> field:int nr; offset:8; size:4; signed:1; >>>> field:aio_context_t ctx_id; offset:16; size:8; signed:0; >>>> field:long min_nr; offset:24; size:8; signed:0; >>>> field:long nr; offset:32; size:8; signed:0; >>>> field:struct io_event * events; offset:40; size:8; signed:0; >>>> field:struct timespec * timeout; offset:48; size:8; signed:0; >>>> >>>> print fmt: "ctx_id: 0x%08lx, min_nr: 0x%08lx, nr: 0x%08lx, >>>> events: 0x%08lx, timeout: 0x%08lx", ((unsigned long)(REC->ctx_id)), >>>> ((unsigned long)(REC->min_nr)), ((unsigned long)(REC->nr)), >>>> ((unsigned long)(REC->events)), ((unsigned long)(REC->timeout)) >>>> >>>> As above 'int nr;' and 'long nr;' fields have >>>> duplicated name so problems are occurred in perf-script i.e. >>>> >>>> # perf record -e syscalls:* >>>> # perf script -g python >>>> # perf script -s perf-script.py >>>> File "perf-script.py", line 8694 >>>> def syscalls__sys_enter_io_getevents(event_name, context, common_cpu, >>>> SyntaxError: duplicate argument 'nr' in function definition >>>> Error running python script perf-script.py >>>> >>>> As above, problems about duplicated argument occurred. >>>> Not only sys_enter_io_getevent() but also sys_enter_io_submit() >>>> have relevevance to this problem. >>>> >>>> So rename a field 'nr' to '__syscall_nr' for system call number >>>> without renaming a member 'nr' of two structures 'syscall_trace_enter' >>>> and 'syscall_trace_exit'. >>>> >>>> Cc: Thomas Gleixner <tglx@...utronix.de> >>>> Cc: Peter Zijlstra <peterz@...radead.org> >>>> Cc: Ingo Molnar <mingo@...hat.com> >>>> Cc: Arnaldo Carvalho de Melo <acme@...nel.org> >>>> Cc: Lai Jiangshan <jiangshanlai@...il.com> >>>> Signed-off-by: Taeung Song <treeze.taeung@...il.com> >>>> Signed-off-by: Steven Rostedt <rostedt@...dmis.org> >>>> --- >>>> kernel/trace/trace_syscalls.c | 16 +++++++++------- >>>> 1 file changed, 9 insertions(+), 7 deletions(-) >>>> >>>> diff --git a/kernel/trace/trace_syscalls.c b/kernel/trace/trace_syscalls.c >>>> index 0655afb..d166308 100644 >>>> --- a/kernel/trace/trace_syscalls.c >>>> +++ b/kernel/trace/trace_syscalls.c >>>> @@ -186,11 +186,11 @@ print_syscall_exit(struct trace_iterator *iter, int flags, >>>> >>>> extern char *__bad_type_size(void); >>>> >>>> -#define SYSCALL_FIELD(type, name) \ >>>> - sizeof(type) != sizeof(trace.name) ? \ >>>> +#define SYSCALL_FIELD(type, field, name) \ >>>> + sizeof(type) != sizeof(trace.field) ? \ >>>> __bad_type_size() : \ >>>> - #type, #name, offsetof(typeof(trace), name), \ >>>> - sizeof(trace.name), is_signed_type(type) >>>> + #type, #name, offsetof(typeof(trace), field), \ >>>> + sizeof(trace.field), is_signed_type(type) >>>> >>>> static int __init >>>> __set_enter_print_fmt(struct syscall_metadata *entry, char *buf, int len) >>>> @@ -261,7 +261,8 @@ static int __init syscall_enter_define_fields(struct trace_event_call *call) >>>> int i; >>>> int offset = offsetof(typeof(trace), args); >>>> >>>> - ret = trace_define_field(call, SYSCALL_FIELD(int, nr), FILTER_OTHER); >>>> + ret = trace_define_field(call, SYSCALL_FIELD(int, nr, __syscall_nr), >>>> + FILTER_OTHER); >>>> if (ret) >>>> return ret; >>>> >>>> @@ -281,11 +282,12 @@ static int __init syscall_exit_define_fields(struct trace_event_call *call) >>>> struct syscall_trace_exit trace; >>>> int ret; >>>> >>>> - ret = trace_define_field(call, SYSCALL_FIELD(int, nr), FILTER_OTHER); >>>> + ret = trace_define_field(call, SYSCALL_FIELD(int, nr, __syscall_nr), >>>> + FILTER_OTHER); >>>> if (ret) >>>> return ret; >>>> >>>> - ret = trace_define_field(call, SYSCALL_FIELD(long, ret), >>>> + ret = trace_define_field(call, SYSCALL_FIELD(long, ret, ret), >>>> FILTER_OTHER); >>>> >>>> return ret;
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