Messages in this thread | | | Date | Wed, 21 Aug 2002 11:45:06 -0700 (PDT) | From | Mukesh Rajan <> | Subject | Re: detecting hard disk idleness |
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this again would mean that i would have to poll the /proc/interrupt file. i want to avoid polling because of very small poll interval causing overhead. i am still wondering if this could be implemented with some sort of interrupt mechanism in linux (kernel interrupting user program or user program waiting on some signal)
- mukesh
On Wed, 21 Aug 2002, Richard Zidlicky wrote:
> On Tue, Aug 20, 2002 at 11:25:11PM -0700, Mukesh Rajan wrote: > > hi, > > > > i'm trying to implement an alogrithm that requires as input the idleness > > period of a hard disk (i.e. time between satisfying a request and arrival > > of new request). > > > > so far implementation polls "proc/stat" periodically to detect idleness > > over the poll period. this implementation is not accurate and also i have > > very small poll interval (milli secs). with some measurements, conclusion > > is that implementation is consuming quite some power. this millisecond > > polling overhead could be avoided if i can come up with an interrupt > > driven implementation. in DOS, i would have manipulated the interrupt > > table and inserted my code for 13h (disk interrupt right?). this would > > help me do some preprocessing before the actual call to the hard disk > > (13h). > > > > is this possible in any way in Linux? i.e. have the kernel inform a > > program when a hard disk interrupt occurs? either through interrupt > > manipulation or otherwise? > > cat /proc/interrupts > > Richard >
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