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SubjectRe: [patch 12/17] LTTng instrumentation - page
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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@polymtl.ca>
> CC: Martin Bligh <mbligh@google.com>
> CC: Masami Hiramatsu <mhiramat@redhat.com>
> CC: 'Peter Zijlstra' <peterz@infradead.org>
> CC: "Frank Ch. Eigler" <fche@redhat.com>
> CC: 'Ingo Molnar' <mingo@elte.hu>
> CC: 'Hideo AOKI' <haoki@redhat.com>
> CC: Takashi Nishiie <t-nishiie@np.css.fujitsu.com>
> CC: 'Steven Rostedt' <rostedt@goodmis.org>
> CC: Eduard - Gabriel Munteanu <eduard.munteanu@linux360.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

> @@ -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
>



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