Jan Hudec wrote:
On Fri, Aug 05, 2005 at 20:18:44 +0000, Vincenzo Mallozzi wrote:
In oder word, I've read in various Linux Kernel book (like Linux Kernel
Programming, Linux Kernel Development, etc) that the use of spin lock in
Interrupt Handler function must be very limited. Is it true?
Um, yes. And use of spin-lock should ALWAYS be very limited.
can you be more quantitative here ?
whats the average duration of a blocking spinlock in the various
PREMPT_* flavors ?
whats a good target 'minimum' locked time for an un-contended lock ?
what is the overhead (in whatever units) for each kind of lock
are these factors in the choice, or are they completely overwhelmed by
structural factors ?
like: thou shalt not sleep with this kind of lock taken,
these are probably poorly formulated questions,
but hopefully the idea/desire is clear enough
tia
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