linux-kernel - Re: [PATCH] powerpc/thp: tracing: Hide hugepage events under CONFIG_PPC_BOOK3S

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Message-ID: <8306ebfd-0836-4ed6-bd2d-0a8039f6a8c6@linux.ibm.com>
Date: Fri, 25 Jul 2025 08:45:02 +0530
From: Madhavan Srinivasan <maddy@...ux.ibm.com>
To: Steven Rostedt <rostedt@...dmis.org>, LKML
 <linux-kernel@...r.kernel.org>,
        Linux trace kernel <linux-trace-kernel@...r.kernel.org>,
        linux-mm@...ck.org
Cc: Masami Hiramatsu <mhiramat@...nel.org>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        David Hildenbrand <david@...hat.com>,
        Michael Ellerman <mpe@...erman.id.au>
Subject: Re: [PATCH] powerpc/thp: tracing: Hide hugepage events under
 CONFIG_PPC_BOOK3S_64



On 7/24/25 6:58 PM, Steven Rostedt wrote:
> 
> Anyone have any issues with this patch? Should I take it in my tree?
> 
> -- Steve
> 
> 

Acked-by: Madhavan Srinivasan <maddy@...ux.ibm.com>

Yes, kindly take it via your tree 

Thanks
Maddy

> On Thu, 12 Jun 2025 10:12:59 -0400
> Steven Rostedt <rostedt@...dmis.org> wrote:
> 
>> From: Steven Rostedt <rostedt@...dmis.org>
>>
>> The events hugepage_set_pmd, hugepage_set_pud, hugepage_update_pmd and
>> hugepage_update_pud are only called when CONFIG_PPC_BOOK3S_64 is defined.
>> As each event can take up to 5K regardless if they are used or not, it's
>> best not to define them when they are not used. Add #ifdef around these
>> events when they are not used.
>>
>> Signed-off-by: Steven Rostedt (Google) <rostedt@...dmis.org>
>> ---
>> Note, I will be adding code soon that will make unused events cause a warning.
>>
>>  include/trace/events/thp.h | 2 ++
>>  1 file changed, 2 insertions(+)
>>
>> diff --git a/include/trace/events/thp.h b/include/trace/events/thp.h
>> index f50048af5fcc..c8fe879d5828 100644
>> --- a/include/trace/events/thp.h
>> +++ b/include/trace/events/thp.h
>> @@ -8,6 +8,7 @@
>>  #include <linux/types.h>
>>  #include <linux/tracepoint.h>
>>  
>> +#ifdef CONFIG_PPC_BOOK3S_64
>>  DECLARE_EVENT_CLASS(hugepage_set,
>>  
>>  	    TP_PROTO(unsigned long addr, unsigned long pte),
>> @@ -66,6 +67,7 @@ DEFINE_EVENT(hugepage_update, hugepage_update_pud,
>>  	    TP_PROTO(unsigned long addr, unsigned long pud, unsigned long clr, unsigned long set),
>>  	    TP_ARGS(addr, pud, clr, set)
> 
>>  );
>> +#endif /* CONFIG_PPC_BOOK3S_64 */
>>  
>>  DECLARE_EVENT_CLASS(migration_pmd,
>>  
>