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List:       olpc-linux-mm-cc
Subject:    Re: [linux-mm-cc] Testing ccache swap on N810
From:       "Nitin Gupta" <nitingupta910 () gmail ! com>
Date:       2008-01-07 10:43:45
Message-ID: 4cefeab80801070231k69df3366x102340554ed55b4c () mail ! gmail ! com
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Hi Anderson,

On Jan 7, 2008 12:41 AM, Anderson Briglia <anderson@briglia.net> wrote:

> I backported the actual code from [1] to 2.6.21 kernel version, used on
> Nokia N810 device. This is an embedded Linux device using an ARM-OMAP
> processor. Well, after some compilation problems due to bio interface
> changes, I got ccache modules compiled.


Now ccache compiles with kernels >= 2.6.21 too (I didn't try with even older
kernels). Also, sys_swapon() does not hang now (this never happened with
2.6.24-rcX).


>
> The problem now is happening when I try to "swapon" /dev/ccache.
> sys_swapon() never finishes and seems that we have a deadlock there. I'm
> investigating what's going on with sys_swapon() but I really appreciate if
> you point something that could cause this.


Looks like you were doing same mistake as I was doing initially.
bio_io_error() should be called as bio_io_error(bio, bio->bi_size) and not
as bio_io_error(bio, 0). This was causing read() on /dev/ccache to hang.



>
> Good work Nitin, I intend to contribute to your project. :)
>

Thanks :)



> [1] http://code.google.com/p/ccache/source



Cheers,
Nitin

[Attachment #5 (text/html)]

Hi Anderson,<br><br><div class="gmail_quote">On Jan 7, 2008 12:41 AM, Anderson \
Briglia &lt;<a href="mailto:anderson@briglia.net">anderson@briglia.net</a>&gt; \
wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, \
204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"> I backported the actual code \
from [1] to 2.6.21 kernel version, used on Nokia N810 device. This is an embedded \
Linux device using an ARM-OMAP processor. Well, after some compilation problems due \
to bio interface changes, I got ccache modules compiled. </blockquote><div><br>Now \
ccache compiles with kernels &gt;= 2.6.21 too (I didn&#39;t try with even older \
kernels). Also, sys_swapon() does not hang now (this never happened with \
2.6.24-rcX).<br><br></div><blockquote class="gmail_quote" style="border-left: 1px \
solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"> <br><br>The \
problem now is happening when I try to &quot;swapon&quot; /dev/ccache. sys_swapon() \
never finishes and seems that we have a deadlock there. I&#39;m investigating \
what&#39;s going on with sys_swapon() but I really appreciate if you point something \
that could cause this. </blockquote><div><br>Looks like you were doing same mistake \
as I was doing initially. bio_io_error() should be called as bio_io_error(bio, \
bio-&gt;bi_size) and not as bio_io_error(bio, 0). This was causing read() on \
/dev/ccache to hang. <br>&nbsp;<br>&nbsp;</div><blockquote class="gmail_quote" \
style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; \
padding-left: 1ex;"><br>Good work Nitin, I intend to contribute to your project. \
:)<br></blockquote> <div><br>Thanks :) <br><br><br></div><blockquote \
class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt \
0pt 0.8ex; padding-left: 1ex;"><br>[1] <a \
href="http://code.google.com/p/ccache/source" target="_blank"> \
http://code.google.com/p/ccache/source</a></blockquote><div><br><br>Cheers,<br>Nitin<br>&nbsp;<br></div></div><br>




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