linux-kernel - Re: [tip:core/debugobjects] debugobjects: Track number of kmem_cache_alloc/kmem_cache

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Date:   Sun, 5 Feb 2017 11:08:37 +0100
From:   Ingo Molnar <mingo@...nel.org>
To:     borntraeger@...ibm.com, tglx@...utronix.de, hpa@...or.com,
        linux-kernel@...r.kernel.org, longman@...hat.com,
        changbin.du@...el.com, jstancek@...hat.com,
        akpm@...ux-foundation.org
Cc:     linux-tip-commits@...r.kernel.org
Subject: Re: [tip:core/debugobjects] debugobjects: Track number of
 kmem_cache_alloc/kmem_cache_free done


* tip-bot for Waiman Long <tipbot@...or.com> wrote:

> Commit-ID:  c4b73aabd0989d93b82894417ae501690bd1db5e
> Gitweb:     http://git.kernel.org/tip/c4b73aabd0989d93b82894417ae501690bd1db5e
> Author:     Waiman Long <longman@...hat.com>
> AuthorDate: Thu, 5 Jan 2017 15:17:03 -0500
> Committer:  Thomas Gleixner <tglx@...utronix.de>
> CommitDate: Sat, 4 Feb 2017 09:01:54 +0100
> 
> debugobjects: Track number of kmem_cache_alloc/kmem_cache_free done
> 
> New debugfs stat counters are added to track the numbers of
> kmem_cache_alloc() and kmem_cache_free() function calls to get a
> sense of how the internal debug objects cache management is performing.
> 
> Signed-off-by: Waiman Long <longman@...hat.com>
> Cc: Christian Borntraeger <borntraeger@...ibm.com>
> Cc: "Du Changbin" <changbin.du@...el.com>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: Jan Stancek <jstancek@...hat.com>
> Link: http://lkml.kernel.org/r/1483647425-4135-2-git-send-email-longman@redhat.com
> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
> 
> ---
>  lib/debugobjects.c | 10 ++++++++++
>  1 file changed, 10 insertions(+)
> 
> diff --git a/lib/debugobjects.c b/lib/debugobjects.c
> index 04c1ef7..d78673e 100644
> --- a/lib/debugobjects.c
> +++ b/lib/debugobjects.c
> @@ -55,6 +55,12 @@ static int			debug_objects_enabled __read_mostly
>  
>  static struct debug_obj_descr	*descr_test  __read_mostly;
>  
> +/*
> + * Track numbers of kmem_cache_alloc and kmem_cache_free done.

Nit:

   /*
    * Track the number of kmem_cache_alloc()/free() calls done.
    */

Another nit:

> + */
> +static int			debug_objects_alloc;
> +static int			debug_objects_freed;

Yeah, so we want to either use past tense consistently:

   static int			debug_objects_allocated;
   static int			debug_objects_freed;

Or we want to use present tense consistently:

   static int			debug_objects_alloc;
   static int			debug_objects_free;

... but we don't want to mix the two when naming related counters!

( Btw., I'm for the _allocated/_freed pattern, that's what the usual nomenclature 
  for statistics counters. )

> +	seq_printf(m, "objects_alloc :%d\n", debug_objects_alloc);
> +	seq_printf(m, "objects_freed :%d\n", debug_objects_freed);

Ditto.

Thanks,

	Ingo