Messages in this thread | | | Date | Wed, 16 Jul 2008 11:03:47 -0400 | From | Mathieu Desnoyers <> | Subject | Re: [patch 12/17] LTTng instrumentation - page |
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* Peter Zijlstra (peterz@infradead.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@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 >
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 > > >
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