Re: [Bug 12832] New: kernel leaks a lot of memory

[Wu Fengguang <fengguang.wu@intel.com>]

On Mon, Mar 09, 2009 at 05:02:16PM +0200, Pierre Ossman wrote:
> On Mon, 9 Mar 2009 22:22:41 +0800
> Wu Fengguang <fengguang.wu@intel.com> wrote:
>
> >
> > Thanks for the data! Now it seems that some pages are totally missing
> > from bootmem or slabs or page cache or any application consumptions...
> >
>
> So it isn't just me that's blind. That's something I guess. :)
>
> > Will searching through /proc/kpageflags for reserved pages help
> > identify the problem?
> >
> > Oh kpageflags_read() does not include support for PG_reserved:
> >
>
> I can probably hack together something that outputs the served pages.
> Anything else that is of interest?

Sure, Matt Mackall provides some example scripts for interpreting the
kpageflags file:

        http://selenic.com/repo/pagemap/

> > > DirectMap2M:  18446744073709551613
> >
> > This field looks weird.
> >
>
> Sorry, red herring. I'm in the middle of a bisect and that particular
> old bug happened to surface. It was not present with the releases
> 2.6.27.

That's OK.

        pgfault 25624481
        pgmajfault 2490
        pgrefill_dma 8144
        pgrefill_dma32 103508
        pgsteal_dma 4503
        pgsteal_dma32 179395
        pgscan_kswapd_dma 4999
        pgscan_kswapd_dma32 180546
        pgscan_direct_dma32 384
        slabs_scanned 153856

The above vmstat numbers are a bit large, maybe it's not a fresh booted system?

Thanks,
Fengguang

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