[laptop-mode] Enabling Laptop Mode Activate Pdflush Every 3-4 Seconds

[Ritesh Raj Sarraf]

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Hi Casey,

On Wednesday 27 May 2009 13:01:21 Ritesh Raj Sarraf wrote:
> On Wednesday 27 May 2009 11:39:28 Casey McGinty wrote:
> > 4. Open dmesg_before.txt and dmesg_after.txt. Remove the lines from
> >  dmesg_after.txt that are also in dmesg.before.txt.
> >
> >  5. Send us the contents of dmesg_after.txt.
> >
> >
> > The file is attached...
>
> The log shows a lot of pdflush calls. I'm wondering what might be
> triggering it. I also noticed a vmware_hostd call being made. Do you have
> any VMWare product running ? With a guest in it ?
>
> Probably, Bart can give us more insight into this behavior.
>
> Just to be clear, you don't see the writes happening when there is no
> laptop- mode enabled ?
>

The other thing I noticed in your logs is:

[109411.067377] lgdt330x: i2c_read_demod_bytes: addr 0x0e select 0x58 error=
=20
(ret =3D=3D -19)
[109411.068000] lgdt330x: i2c_read_demod_bytes: addr 0x0e select 0x1c error=
=20
(ret =3D=3D -19)


I looked into the kernel source and it is related to a dvb driver.

This is what is getting triggered as part of your driver.

    if (ret !=3D 2) {
        printk(KERN_WARNING "lgdt330x: %s: addr 0x%02x select 0x%02x error=
=20
(ret =3D=3D %i)\n", __func__, state->config->demod_address, reg, ret);

With syslogd running, this message will be logged to syslog, which would th=
en=20
trigger an write.

The only question is, how much of this message is being written and how=20
frequently.

With laptop-mode enabled, when a daemon/driver logs to syslog, when is a=20
pdflush triggered and after how much of dirty pages?

Ritesh
=2D-=20
Ritesh Raj Sarraf
RESEARCHUT - http://www.researchut.com
"Necessity is the mother of invention."


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