[Bug 16265] Why is kslowd accumulating so much CPU time?

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=16265


alfonso.pola@gmail.com changed:

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                 CC|                            |alfonso.pola@gmail.com

Chris Wilson <chris@chris-wilson.co.uk> changed:

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                 CC|                            |chris@chris-wilson.co.uk




--- Comment #3 from alfonso.pola@gmail.com  2010-08-12 00:15:51 ---
I'm having this problem with kernel 2.6.35.1 in archlinux. I'm willing to
provide debugging information, I just don't know what should I post. I have a
lenovo sl300 laptop with intel integrated graphics (HD4500 I believe).

--- Comment #4 from Chris Wilson <chris@chris-wilson.co.uk>  2010-08-13 08:13:45 ---
Ok, we understand what's going on here now. Every 10s the non-hotplug capable
outputs are polled for connection/disconnection events. For a certain class of
analog device on some hardware this is very slow and CPU intensive.

See also https://bugs.freedesktop.org/show_bug?id=29536

The first workaround proposed is just to disable polling via a module
parameter. The eventual solution will likely be a mix of finer grained locking
and cheaper, non-destructive polling.

--- Comment #5 from alfonso.pola@gmail.com  2010-08-13 19:51:15 ---
ok, cool.

PS: The link is http://bugs.freedesktop.org/show_bug.cgi?id=29536

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