lkml.org 
[lkml]   [2007]   [Apr]   [25]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH] i386: For debugging, make the initial page table setup less forgiving.
Andrew Morton wrote:

>
> This patch causes oopses after a minute or so running LTP's
>
> ./testcases/bin/growfiles -W gf16 -b -e 1 -i 0 -L 120 -u -g 4090 -T 100 -t 408990 -l -C 10 -c 1000 -S 10 -f Lgf02_
>
> on everyone's favoutite Vaio, configured with
> http://userweb.kernel.org/~akpm/config-sony.txt
>

*BLINK*

This patch only affects the initial page tables, which should have been
thrown out *way* long ago at this point.

Yet they seem to have stuck around. This is a very bad thing on many
levels, especially since we should have switched the kernel 1:1 area
over to PSE pages a long time ago.

> BUG: unable to handle kernel paging request at virtual address c084fa8c
> printing eip:
> c0174c46
> *pde = 0042a027
> *pte = 00000000

Touching a non-PSE page which is zero, and quite consistent with being a
remnant from the original page tables.

Methinks this has smoked out a bug in the initial page table setup which
probably has been a performance roadblock for quite some time.

-hpa
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2007-04-25 17:31    [from the cache]
©2003-2011 Jasper Spaans. Advertise on this site