linux-kernel - Re: [PATCH v3] trace:Add "gfp_t" support in synthetic

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Date:   Tue, 3 Sep 2019 16:15:23 +0800
From:   Xing Zhengjun <zhengjun.xing@...ux.intel.com>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     Tom Zanussi <zanussi@...nel.org>, mingo@...hat.com,
        tom.zanussi@...ux.intel.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] trace:Add "gfp_t" support in synthetic_events

  Hi Steve,

On 8/13/2019 11:04 AM, Steven Rostedt wrote:
> On Tue, 13 Aug 2019 09:04:28 +0800
> Xing Zhengjun <zhengjun.xing@...ux.intel.com> wrote:
> 
>> Hi Steve,
>>
>>      Could you help to review? Thanks.
> 
> Thanks for the ping. Yes, I'll take a look at it. I'll be pulling in a
> lot of patches that have queued up.
> 
> -- Steve

Could you help to review? Thanks.

> 
> 
>>
>> On 7/13/2019 12:05 AM, Tom Zanussi wrote:
>>> Hi Zhengjun,
>>>
>>> On Fri, 2019-07-12 at 09:53 +0800, Zhengjun Xing wrote:
>>>> Add "gfp_t" support in synthetic_events, then the "gfp_t" type
>>>> parameter in some functions can be traced.
>>>>
>>>> Prints the gfp flags as hex in addition to the human-readable flag
>>>> string.  Example output:
>>>>
>>>>     whoopsie-630 [000] ...1 78.969452: testevent: bar=b20
>>>> (GFP_ATOMIC|__GFP_ZERO)
>>>>       rcuc/0-11  [000] ...1 81.097555: testevent: bar=a20 (GFP_ATOMIC)
>>>>       rcuc/0-11  [000] ...1 81.583123: testevent: bar=a20 (GFP_ATOMIC)
>>>>
>>>> Signed-off-by: Tom Zanussi <zanussi@...nel.org>
>>>> Signed-off-by: Zhengjun Xing <zhengjun.xing@...ux.intel.com>
>>>
>>> Looks good to me, thanks!
>>>
>>> Tom
>>>    
>>>> ---
>>>>    kernel/trace/trace_events_hist.c | 19 +++++++++++++++++++
>>>>    1 file changed, 19 insertions(+)
>>>>
>>>> diff --git a/kernel/trace/trace_events_hist.c
>>>> b/kernel/trace/trace_events_hist.c
>>>> index ca6b0dff60c5..30f0f32aca62 100644
>>>> --- a/kernel/trace/trace_events_hist.c
>>>> +++ b/kernel/trace/trace_events_hist.c
>>>> @@ -13,6 +13,10 @@
>>>>    #include <linux/rculist.h>
>>>>    #include <linux/tracefs.h>
>>>>    
>>>> +/* for gfp flag names */
>>>> +#include <linux/trace_events.h>
>>>> +#include <trace/events/mmflags.h>
>>>> +
>>>>    #include "tracing_map.h"
>>>>    #include "trace.h"
>>>>    #include "trace_dynevent.h"
>>>> @@ -752,6 +756,8 @@ static int synth_field_size(char *type)
>>>>    		size = sizeof(unsigned long);
>>>>    	else if (strcmp(type, "pid_t") == 0)
>>>>    		size = sizeof(pid_t);
>>>> +	else if (strcmp(type, "gfp_t") == 0)
>>>> +		size = sizeof(gfp_t);
>>>>    	else if (synth_field_is_string(type))
>>>>    		size = synth_field_string_size(type);
>>>>    
>>>> @@ -792,6 +798,8 @@ static const char *synth_field_fmt(char *type)
>>>>    		fmt = "%lu";
>>>>    	else if (strcmp(type, "pid_t") == 0)
>>>>    		fmt = "%d";
>>>> +	else if (strcmp(type, "gfp_t") == 0)
>>>> +		fmt = "%x";
>>>>    	else if (synth_field_is_string(type))
>>>>    		fmt = "%s";
>>>>    
>>>> @@ -834,9 +842,20 @@ static enum print_line_t
>>>> print_synth_event(struct trace_iterator *iter,
>>>>    					 i == se->n_fields - 1 ? ""
>>>> : " ");
>>>>    			n_u64 += STR_VAR_LEN_MAX / sizeof(u64);
>>>>    		} else {
>>>> +			struct trace_print_flags __flags[] = {
>>>> +			    __def_gfpflag_names, {-1, NULL} };
>>>> +
>>>>    			trace_seq_printf(s, print_fmt, se-
>>>>> fields[i]->name,
>>>>    					 entry->fields[n_u64],
>>>>    					 i == se->n_fields - 1 ? ""
>>>> : " ");
>>>> +
>>>> +			if (strcmp(se->fields[i]->type, "gfp_t") ==
>>>> 0) {
>>>> +				trace_seq_puts(s, " (");
>>>> +				trace_print_flags_seq(s, "|",
>>>> +						      entry-
>>>>> fields[n_u64],
>>>> +						      __flags);
>>>> +				trace_seq_putc(s, ')');
>>>> +			}
>>>>    			n_u64++;
>>>>    		}
>>>>    	}
>>
> 

-- 
Zhengjun Xing