linux-kernel - Re: [patch 12/17] LTTng instrumentation

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Message-ID: <20080716150347.GJ24546@Krystal>
Date:	Wed, 16 Jul 2008 11:03:47 -0400
From:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	akpm@...ux-foundation.org, Ingo Molnar <mingo@...e.hu>,
	linux-kernel@...r.kernel.org,
	Masami Hiramatsu <mhiramat@...hat.com>,
	Martin Bligh <mbligh@...gle.com>,
	"Frank Ch. Eigler" <fche@...hat.com>,
	Hideo AOKI <haoki@...hat.com>,
	Takashi Nishiie <t-nishiie@...css.fujitsu.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Eduard - Gabriel Munteanu <eduard.munteanu@...ux360.ro>
Subject: Re: [patch 12/17] LTTng instrumentation - page

* Peter Zijlstra (peterz@...radead.org) wrote:
> On Tue, 2008-07-15 at 18:26 -0400, Mathieu Desnoyers wrote:
> > plain text document attachment (lttng-instrumentation-page.patch)
> > Paging activity instrumentation. Instruments page allocation/free to keep track
> > of page allocation. This does not cover hugetlb activity, which is covered by a
> > separate patch.
> > 
> > Those tracepoints are used by LTTng.
> > 
> > About the performance impact of tracepoints (which is comparable to markers),
> > even without immediate values optimizations, tests done by Hideo Aoki on ia64
> > show no regression. His test case was using hackbench on a kernel where
> > scheduler instrumentation (about 5 events in code scheduler code) was added.
> > See the "Tracepoints" patch header for performance result detail.
> > 
> > Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
> > CC: Martin Bligh <mbligh@...gle.com>
> > CC: Masami Hiramatsu <mhiramat@...hat.com>
> > CC: 'Peter Zijlstra' <peterz@...radead.org>
> > CC: "Frank Ch. Eigler" <fche@...hat.com>
> > CC: 'Ingo Molnar' <mingo@...e.hu>
> > CC: 'Hideo AOKI' <haoki@...hat.com>
> > CC: Takashi Nishiie <t-nishiie@...css.fujitsu.com>
> > CC: 'Steven Rostedt' <rostedt@...dmis.org>
> > CC: Eduard - Gabriel Munteanu <eduard.munteanu@...ux360.ro>
> > ---
> >  include/trace/page.h |   16 ++++++++++++++++
> >  mm/page_alloc.c      |    6 ++++++
> >  2 files changed, 22 insertions(+)
> > 
> > Index: linux-2.6-lttng/mm/page_alloc.c
> > ===================================================================
> > --- linux-2.6-lttng.orig/mm/page_alloc.c	2008-07-15 13:54:46.000000000 -0400
> > +++ linux-2.6-lttng/mm/page_alloc.c	2008-07-15 14:04:38.000000000 -0400
> > @@ -46,6 +46,7 @@
> >  #include <linux/page-isolation.h>
> >  #include <linux/memcontrol.h>
> >  #include <linux/debugobjects.h>
> > +#include <trace/page.h>
> >  
> >  #include <asm/tlbflush.h>
> >  #include <asm/div64.h>
> > @@ -510,6 +511,8 @@ static void __free_pages_ok(struct page 
> >  	int i;
> >  	int reserved = 0;
> >  
> > +	trace_page_free(page, order);
> > +
> >  	for (i = 0 ; i < (1 << order) ; ++i)
> >  		reserved += free_pages_check(page + i);
> >  	if (reserved)
> > @@ -966,6 +969,8 @@ static void free_hot_cold_page(struct pa
> >  	struct per_cpu_pages *pcp;
> >  	unsigned long flags;
> >  
> > +	trace_page_free(page, 0);
> > +
> >  	if (PageAnon(page))
> >  		page->mapping = NULL;
> >  	if (free_pages_check(page))
> > @@ -1630,6 +1635,7 @@ nopage:
> >  		show_mem();
> >  	}
> >  got_pg:
> > +	trace_page_alloc(page, order);
> >  	return page;
> >  }
> >  
> > Index: linux-2.6-lttng/include/trace/page.h
> > ===================================================================
> > --- /dev/null	1970-01-01 00:00:00.000000000 +0000
> > +++ linux-2.6-lttng/include/trace/page.h	2008-07-15 14:04:38.000000000 -0400
> 
> This name seems inconsitent with your other choices.
> 
> include/traec/page_alloc.h comes to mind
> 

Yes, good idea, will fix.

Mathieu

> > @@ -0,0 +1,16 @@
> > +#ifndef _TRACE_PAGE_H
> > +#define _TRACE_PAGE_H
> > +
> > +#include <linux/tracepoint.h>
> > +
> > +/*
> > + * mm_page_alloc : page can be NULL.
> > + */
> > +DEFINE_TRACE(page_alloc,
> > +	TPPROTO(struct page *page, unsigned int order),
> > +	TPARGS(page, order));
> > +DEFINE_TRACE(page_free,
> > +	TPPROTO(struct page *page, unsigned int order),
> > +	TPARGS(page, order));
> > +
> > +#endif
> > 
> 

-- 
Mathieu Desnoyers
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68
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