Re: [Patch] mm tracepoints

[KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>]

> 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.