Messages in this thread | | | Date | Fri, 6 Mar 2009 12:04:23 +0100 | From | Ingo Molnar <> | Subject | Re: [Patch] mm tracepoints |
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* Steven Rostedt <rostedt@goodmis.org> wrote:
> > 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.
yeah, would be nice to have a patch against:
http://people.redhat.com/mingo/tip.git/README
> > 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?
Correct - so the mm ID looks useful.
> But the pfn is helpful since it is a unique identifier for > what physical page was mapped.
Yeah. Nevertheless some sort of filename:offset indicator would be nice too. (as an add-on)
Ingo
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