linux-kernel - Re: [PATCH] mm/thp: Drop unused trace events hugepage

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Date:   Wed, 12 Jan 2022 10:17:48 +0100
From:   David Hildenbrand <david@...hat.com>
To:     Anshuman Khandual <anshuman.khandual@....com>, linux-mm@...ck.org
Cc:     Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com>,
        "Kirill A . Shutemov" <kirill@...temov.name>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm/thp: Drop unused trace events
 hugepage_[invalidate|splitting]

On 07.01.22 10:05, Anshuman Khandual wrote:
> The trace events hugepage_[invalidate|splitting], were added via the commit
> 9e813308a5c1 ("powerpc/thp: Add tracepoints to track hugepage invalidate").
> Afterwards their call sites i.e trace_hugepage_[invalidate|splitting] were
> just dropped off, leaving these trace points unused.
> 
> Cc: Steven Rostedt <rostedt@...dmis.org>
> Cc: Ingo Molnar <mingo@...hat.com>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: "Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com>
> Cc: Kirill A. Shutemov <kirill@...temov.name>
> Cc: linux-mm@...ck.org
> Cc: linux-kernel@...r.kernel.org
> Signed-off-by: Anshuman Khandual <anshuman.khandual@....com>
> ---
> This applies on v5.16-rc8
> 
> trace_hugepage_splitting() dropped via the commit 7aa9a23c69ea
> trace_hugepage_invalidate() dropped via the commit 7900757ce1b4
> 
>  include/trace/events/thp.h | 36 ------------------------------------
>  1 file changed, 36 deletions(-)
> 
> diff --git a/include/trace/events/thp.h b/include/trace/events/thp.h
> index d7fbbe551841..ffa4b37d02a9 100644
> --- a/include/trace/events/thp.h
> +++ b/include/trace/events/thp.h
> @@ -8,24 +8,6 @@
>  #include <linux/types.h>
>  #include <linux/tracepoint.h>
>  
> -TRACE_EVENT(hugepage_invalidate,
> -
> -	    TP_PROTO(unsigned long addr, unsigned long pte),
> -	    TP_ARGS(addr, pte),
> -	    TP_STRUCT__entry(
> -		    __field(unsigned long, addr)
> -		    __field(unsigned long, pte)
> -		    ),
> -
> -	    TP_fast_assign(
> -		    __entry->addr = addr;
> -		    __entry->pte = pte;
> -		    ),
> -
> -	    TP_printk("hugepage invalidate at addr 0x%lx and pte = 0x%lx",
> -		      __entry->addr, __entry->pte)
> -);
> -
>  TRACE_EVENT(hugepage_set_pmd,
>  
>  	    TP_PROTO(unsigned long addr, unsigned long pmd),
> @@ -65,24 +47,6 @@ TRACE_EVENT(hugepage_update,
>  
>  	    TP_printk("hugepage update at addr 0x%lx and pte = 0x%lx clr = 0x%lx, set = 0x%lx", __entry->addr, __entry->pte, __entry->clr, __entry->set)
>  );
> -TRACE_EVENT(hugepage_splitting,
> -
> -	    TP_PROTO(unsigned long addr, unsigned long pte),
> -	    TP_ARGS(addr, pte),
> -	    TP_STRUCT__entry(
> -		    __field(unsigned long, addr)
> -		    __field(unsigned long, pte)
> -		    ),
> -
> -	    TP_fast_assign(
> -		    __entry->addr = addr;
> -		    __entry->pte = pte;
> -		    ),
> -
> -	    TP_printk("hugepage splitting at addr 0x%lx and pte = 0x%lx",
> -		      __entry->addr, __entry->pte)
> -);
> -
>  #endif /* _TRACE_THP_H */
>  
>  /* This part must be outside protection */

Reviewed-by: David Hildenbrand <david@...hat.com>

-- 
Thanks,

David / dhildenb