linux-kernel - Re: [PATCH] i386: convert mm_context

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Date:	Mon, 6 Aug 2007 14:15:23 -0300
From:	"Luiz Fernando N. Capitulino" <lcapitulino@...driva.com.br>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] i386: convert mm_context_t semaphore to a mutex

Em Mon, 6 Aug 2007 17:25:02 +0200
Ingo Molnar <mingo@...e.hu> escreveu:

| 
| * Luiz Fernando N. Capitulino <lcapitulino@...driva.com.br> wrote:
| 
| > | hm, looks good to me but i'm wondering why this was a holdout for 
| > | such a long time :-) Did you manage to test actual LDT functionality 
| > | with this patch applied?
| > 
| >  No, I didn't. The only test I did was to run the kernel with this 
| > patch applied.
| > 
| >  I'll manage to test it then. Do you have a test-case or has any 
| > suggestion?
| 
| i think try any pthread program with:
| 
|    export LD_ASSUME_KERNEL=2.4.0
| 
| should trigger the LDT code. Try stracing the code and modify_ldt calls 
| should show up.

 I couldn't run this because my libc requires 2.6 kernels.

 But I've managed to run wine with a game called 'Align-it!', and
I have the following result:

"""
~/tmp/ egrep -c 'modify_ldt' wine-strace.txt 
46
~/tmp/ 
"""

 I've checked the calls and none has failed. Not sure how good
this test is though.

 Maybe it could be more tested in -mm?

| >  Oh, btw, I forgot to 'quilt add arch/i386/mm/fault.c' [...]
| 
| heh. After a dozen of such incidents i scripted my editor command to 
| automatically do the quilt add :)

 Oh, that's a good tip.

 Thanks a lot,

-- 
Luiz Fernando N. Capitulino
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