cpu hog reading battery info

DISCUSSION Pippo Caloggero 2 participants 2 messages Jun 17, 2005 1 message not in the archive ACPI

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Pippo Caloggero

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2005-06-17 13:01 UTC #0 lore raw

Hi after upgrading to 2.6.11 doing a
cat /proc/acpi/battery/BAT0/info
hogs my cpu to the point that X and the mouse block for 1 second.
This is especially annoyng as for example kde battery monitor do that every 20 secs to read battery capacity.

Is it a known bug? Is there some way to dig into it?

Thank you very much
Matteo

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Oisín Mac Fhearaí

2005-06-17 13:36 UTC #2 lore raw

Quoted 7 lines · Pippo Caloggero

Hi after upgrading to 2.6.11 doing a
cat /proc/acpi/battery/BAT0/info
hogs my cpu to the point that X and the mouse block for 1 second. This is especially annoyng as for example kde battery monitor do that every 20 secs to read battery capacity.
Is it a known bug? Is there some way to dig into it?

There's the EC burst mode patch out there which replaces the busy-wait spinlocks in drivers/acpi/ec.c with semaphores:
http://ftp.kernel.org/pub/linux/kernel/people/lenb/acpi/patches/to-akpm/acpi-20050601041442-dtor-KwM2v4JqSEzeGshsqgM8IUPJkLQgvAqAJm6DLlPSJJU@public.gmane.org

Maybe that'll apply for you.

Oisín