linux-kernel - Re: [PATCH 1/4] tracing, page-allocator: Add trace events for page allocation and page freeing

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Date:	Fri,  7 Aug 2009 10:17:57 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Mel Gorman <mel@....ul.ie>
Cc:	kosaki.motohiro@...fujitsu.com,
	Larry Woodman <lwoodman@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>, riel@...hat.com,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <peterz@...radead.org>,
	LKML <linux-kernel@...r.kernel.org>, linux-mm@...ck.org
Subject: Re: [PATCH 1/4] tracing, page-allocator: Add trace events for page allocation and page freeing


> > > diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> > > index d052abb..843bdec 100644
> > > --- a/mm/page_alloc.c
> > > +++ b/mm/page_alloc.c
> > > @@ -1905,6 +1905,7 @@ __alloc_pages_nodemask(gfp_t gfp_mask, unsigned int order,
> > >  				zonelist, high_zoneidx, nodemask,
> > >  				preferred_zone, migratetype);
> > >  
> > > +	trace_mm_page_alloc(_RET_IP_, page, order, gfp_mask, migratetype);
> > >  	return page;
> > >  }
> > 
> > In almost case, __alloc_pages_nodemask() is called from alloc_pages_current().
> > Can you add call_site argument? (likes slab_alloc)
> > 
> 
> In the NUMA case, this will be true but addressing it involves passing down
> an additional argument in the non-tracing case which I wanted to avoid.
> As the stacktrace option is available to ftrace, I think I'll drop call_site
> altogether as anyone who really needs that information has options.

Insted, can we move this tracepoint to alloc_pages_current(), alloc_pages_node() et al ?
On page tracking case, call_site information is one of most frequently used one.
if we need multiple trace combination, it become hard to use and reduce usefulness a bit.



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