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

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Date:	Wed, 26 May 2010 17:54:03 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Eduard - Gabriel Munteanu <eduard.munteanu@...ux360.ro>
Cc:	Li Zefan <lizf@...fujitsu.com>, Ingo Molnar <mingo@...e.hu>,
	Steven Rostedt <rostedt@...dmis.org>,
	Pekka Enberg <penberg@...helsinki.fi>,
	LKML <linux-kernel@...r.kernel.org>, linux-mm@...ck.org
Subject: Re: [PATCH] tracing: Remove kmemtrace ftrace plugin

On Wed, May 26, 2010 at 06:38:43PM +0300, Eduard - Gabriel Munteanu wrote:
> 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 ones, and kmemtrace has been superseded by kmem trace events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>


Thanks, I'm queuing this patch, will add the forgotten Makefile change as
well.

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