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Re: SGI XFS on ppc

To: linux-xfs@xxxxxxxxxxx
Subject: Re: SGI XFS on ppc
From: Thomas Graichen <news-innominate.list.sgi.xfs@xxxxxxxxxxxxx>
Date: 2 Aug 2000 06:17:51 GMT
Distribution: local
Organization: innominate AG, Berlin, Germany
References: <news-innominate.list.sgi.xfs@xxxxxxxxxxxxx> <200008011414.JAA12528@xxxxxxxxxxxxxxxxxxxx>
Reply-to: Thomas Graichen <graichen@xxxxxxxxxxxxx>
Reply-to: thomas.graichen@xxxxxxxxxxxxx
Sender: owner-linux-xfs-announce@xxxxxxxxxxx
User-agent: tin/1.4.2-20000205 ("Possession") (UNIX) (Linux/2.2.16-local (i586))
Steve Lord <lord@xxxxxxx> wrote:

> The place you probably need to scatter printk all over is 
> fs/pagebuf/page_buf.c
> the easiest way to do this is to edit include/linux/page_buf.h and ensure
> that PAGEBUF_TRACE is defined (it is dependent on CONFIG_KDB at the moment).
> Make sure that debug_pagebuf is set to 1.

> Then edit pb_trace_func in page_buf.c and instead of putting data into a
> trace buffer, take something based on the code in kdb/modules/kdbm_pg.c
> which does this:

>                 if ((trace->event < EV_SIZE) && event_names[trace->event]) {
>                         event = event_names[trace->event];
>                 } else if (trace->event == 1000) {
>                         event = (char *)trace->misc;
>                 } else {
>                         event = value;
>                         sprintf(value, "%8d", trace->event);

>                 kdb_printf("pb 0x%lx [%s] (hold %u lock %d) misc 0x%p",
>                            trace->pb, event,
>                            trace->hold, trace->lock_value,
>                            trace->misc);
>                 kdb_symbol_print((unsigned int)trace->ra, NULL,
>                         KDB_SP_SPACEB|KDB_SP_PAREN|KDB_SP_NEWLINE);
>                 kdb_printf("    offset 0x%Lx size 0x%x task 0x%p\n",
>                            trace->offset, trace->size, trace->task);
>                 kdb_printf("    flags: %s\n",
>                            pb_flags(trace->flags));

> (clearly those need to become printk messages).

ok - basicaly got the idea - what of the above info is mostly needed
to debug this ? (i at a first view see no way to get the
kdb_symbol_print thing because it looks like it uses kdb structures
for finding and printing the symbol) - everything else should be
no problem ... ok - will try to get this going


technical director                                       innominate AG
clustering & security                                networking people
tel: +49.30.308806-13 fax: -77 web: http://innominate.de pgp: /pgp/tgr

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