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Date: Tue, 8 Mar 2016 16:32:12 -0300
From: Arnaldo Carvalho de Melo <acme@...nel.org>
To: Steven Rostedt <rostedt@...dmis.org>
Cc: Taeung Song <treeze.taeung@...il.com>,
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
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...
> 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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