From mboxrd@z Thu Jan  1 00:00:00 1970
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Date: Tue, 05 Dec 2006 15:31:54 +0100
From: Jan Kiszka <jan.kiszka@domain.hid>
MIME-Version: 1.0
Subject: Re: [Adeos-main] [PATCH] I-pipe tracer for ARM
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To: Sebastian Smolorz <ssm@domain.hid>
Cc: adeos-main@gna.org

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Sebastian Smolorz wrote:
> Jan Kiszka wrote:
>> Sebastian Smolorz wrote:
>>>>> <    +freeze  0xffffffff     0   97.444N __ipipe_frozen_ctrl+0x108
>>>>> (vfs_write+0xc4)
>>>> Hmm, takes quite a long time to complete the freeze though you only =
have
>>>> 10 post-trace points (which defines its complexity). Unusual, also w=
hen
>>>> comparing with other traced functions.
>>> It seems that it doesn't depend on post-trace-points. When I reduce t=
hem
>>> to 2 the value for the freeze does not get smaller. Maybe it has
>>> something to do with the following lines?
>> Are you tracing into vmalloc'ed memory?
>=20
> Yes, without CONFIG_IPIPE_TRACE_VMALLOC the system does not boot.

Hmm, makes me wonder of some laziness of the page mapping or a missing
lock-against-swapping causes this. Could you have a closer look at the
tracer code if we are lacking some magic for the vmalloc trace buffer
(compare to the xnheap code, e.g.)?

>=20
>> And what results do you get with=20
>> latency -f?
>=20
> These seem to be better (see attachment).

This might shadow earlier page faults, i.e. during the first triggerings.=


Jan


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