linux-kernel - Re: [PATCH] tracing: Remove kmemtrace ftrace plugin

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Date:	Wed, 26 May 2010 18:38:43 +0300
From:	Eduard - Gabriel Munteanu <eduard.munteanu@...ux360.ro>
To:	Li Zefan <lizf@...fujitsu.com>
Cc:	Ingo Molnar <mingo@...e.hu>, Steven Rostedt <rostedt@...dmis.org>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Frederic Weisbecker <fweisbec@...il.com>,
	LKML <linux-kernel@...r.kernel.org>, linux-mm@...ck.org
Subject: Re: [PATCH] tracing: Remove kmemtrace ftrace plugin

On Wed, May 26, 2010 at 05:22:17PM +0800, Li Zefan wrote:
> We have been resisting new ftrace plugins and removing existing
> ones, and kmemtrace has been superseded by kmem trace events
> and perf-kmem, so we remove it.
> 
> Signed-off-by: Li Zefan <lizf@...fujitsu.com>
> Acked-by: Pekka Enberg <penberg@...helsinki.fi>
> ---
>  Documentation/ABI/testing/debugfs-kmemtrace |   71 ----
>  Documentation/trace/kmemtrace.txt           |  126 -------
>  MAINTAINERS                                 |    7 -
>  include/linux/kmemtrace.h                   |   25 --
>  include/linux/slab_def.h                    |    3 +-
>  include/linux/slub_def.h                    |    3 +-
>  init/main.c                                 |    2 -
>  kernel/trace/Kconfig                        |   20 -
>  kernel/trace/kmemtrace.c                    |  529 ---------------------------
>  kernel/trace/trace.h                        |   13 -
>  kernel/trace/trace_entries.h                |   35 --
>  mm/slab.c                                   |    1 -
>  mm/slub.c                                   |    1 -
>  13 files changed, 4 insertions(+), 832 deletions(-)
>  delete mode 100644 Documentation/ABI/testing/debugfs-kmemtrace
>  delete mode 100644 Documentation/trace/kmemtrace.txt
>  delete mode 100644 include/linux/kmemtrace.h
>  delete mode 100644 kernel/trace/kmemtrace.c

Oh my, this one started quite a massacre judging by other replies! :-)

[snip]

> diff --git a/include/linux/slab_def.h b/include/linux/slab_def.h
> index 1812dac..1acfa73 100644
> --- a/include/linux/slab_def.h
> +++ b/include/linux/slab_def.h
> @@ -14,7 +14,8 @@
>  #include <asm/page.h>		/* kmalloc_sizes.h needs PAGE_SIZE */
>  #include <asm/cache.h>		/* kmalloc_sizes.h needs L1_CACHE_BYTES */
>  #include <linux/compiler.h>
> -#include <linux/kmemtrace.h>
> +
> +#include <trace/events/kmem.h>
>  
>  #ifndef ARCH_KMALLOC_MINALIGN
>  /*
> diff --git a/include/linux/slub_def.h b/include/linux/slub_def.h
> index 55695c8..2345d3a 100644
> --- a/include/linux/slub_def.h
> +++ b/include/linux/slub_def.h
> @@ -10,9 +10,10 @@
>  #include <linux/gfp.h>
>  #include <linux/workqueue.h>
>  #include <linux/kobject.h>
> -#include <linux/kmemtrace.h>
>  #include <linux/kmemleak.h>
>  
> +#include <trace/events/kmem.h>
> +
>  enum stat_item {
>  	ALLOC_FASTPATH,		/* Allocation from cpu slab */
>  	ALLOC_SLOWPATH,		/* Allocation by getting a new cpu slab */

[snip]

> diff --git a/mm/slab.c b/mm/slab.c
> index 02786e1..2dba2d4 100644
> --- a/mm/slab.c
> +++ b/mm/slab.c
> @@ -102,7 +102,6 @@
>  #include	<linux/cpu.h>
>  #include	<linux/sysctl.h>
>  #include	<linux/module.h>
> -#include	<linux/kmemtrace.h>
>  #include	<linux/rcupdate.h>
>  #include	<linux/string.h>
>  #include	<linux/uaccess.h>
> diff --git a/mm/slub.c b/mm/slub.c
> index 26f0cb9..a61f1aa 100644
> --- a/mm/slub.c
> +++ b/mm/slub.c
> @@ -17,7 +17,6 @@
>  #include <linux/slab.h>
>  #include <linux/proc_fs.h>
>  #include <linux/seq_file.h>
> -#include <linux/kmemtrace.h>
>  #include <linux/kmemcheck.h>
>  #include <linux/cpu.h>
>  #include <linux/cpuset.h>

I'd suggest including 'trace/events/kmem.h' here as well. Though it most
likely gets the trace_kmem_* stuff through 'linux/slab.h'.

Here's my ack if you need it:

Acked-by: Eduard - Gabriel Munteanu <eduard.munteanu@...ux360.ro>


	Eduard

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