linux-kernel - Re: [Patch] mm tracepoints

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Date:	Thu, 5 Mar 2009 21:26:12 -0500 (EST)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
cc:	Larry Woodman <lwoodman@...hat.com>, linux-kernel@...r.kernel.org,
	mingo@...e.hu, peterz@...radead.org, fweisbec@...il.com
Subject: Re: [Patch] mm tracepoints


On Fri, 6 Mar 2009, KOSAKI Motohiro wrote:

> > I've implemented several mm tracepoints to track page allocation and
> > freeing, various types of pagefaults and unmaps, and critical page
> > reclamation routines.  This is useful for debugging memory allocation
> > issues and system performance problems under heavy memory loads:
> > 
> > # tracer: mm
> > #
> > #           TASK-PID    CPU#    TIMESTAMP  FUNCTION
> > #              | |       |          |         |
> >          pdflush-624   [004]   184.293169: wb_kupdate:
> > (mm_pdflush_kupdate) count=3e48
> >          pdflush-624   [004]   184.293439: get_page_from_freelist:
> > (mm_page_allocation) pfn=447c27 zone_free=1940910
> >         events/6-33    [006]   184.962879: free_hot_cold_page:
> > (mm_page_free) pfn=44bba9
> >       irqbalance-8313  [001]   188.042951: unmap_vmas:
> > (mm_anon_userfree) mm=ffff88044a7300c0 address=7f9a2eb70000 pfn=24c29a
> >              cat-9122  [005]   191.141173: filemap_fault:
> > (mm_filemap_fault) primary fault: mm=ffff88024c9d8f40 address=3cea2dd000
> > pfn=44d68e
> >              cat-9122  [001]   191.143036: handle_mm_fault:
> > (mm_anon_fault) mm=ffff88024c8beb40 address=7fffbde99f94 pfn=24ce22
> > ...
> 
> Hi Larry,
> 
> I've started to evaluate your patch.
> 
> firstly, this patch can't apply tip/master.
> secondly, I don't think the address of mm_struct and pfn help to analysis.
> administrator don't know the page is which file's cache.

The mm_struct may not be helpful since there should be a 1 to 1 mapping 
between user tasks and the mm struct. Hmm, maybe not, due to threads?

But the pfn is helpful since it is a unique identifier for what physical 
page was mapped.

-- Steve

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