use it to retrieve a specific subfeature by type. While it is slighly
less efficient than looping over sensors_get_all_subfeatures(), it
often makes the application code much more elegant.
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chip in the detected chip list. It is more efficient to do it once
and for all than to do it over and over again in
sensors_lookup_feature_nr() and sensors_lookup_subfeature_nr() as
was done before.
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for faster main features lookup. One side effect of this change is
that subfeatures can no longer have labels nor be ignored. I do not
think that this is a problem in practice, and actually this makes a
lot of sense.
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get the list of all main features, and one to get the list of all the
subfeatures of a given main feature. This is a more logical interface for
applications to use. The current implementation is admittedly less than
optimal, because the storage structures weren't meant for it, but this
issue can (and will) be addressed later.
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standard sysfs interface. I don't think it makes much sense to
display the offset values as part of the output of "sensors" (it
would even probably confuse people) but having support for these
in libsensors makes it possible to adjust the offsets in
sensors.conf, which is convenient.
This closes ticket #2248.
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to add more "standard" feature types such as current or power,
we want to give them numbers that immediately follow the fan, voltage
and temperature features, so that the code is as simple as possible.
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* We don't need to compute the mapping during the first pass: this
field is overwritten when renumbering the features anyway.
* Only main features have features mapping to them.
* Only subfeatures have mappings, so we can stop the scan at the next
main feature.
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from its type, there's no need to store this scaling factor. We can
instead compute it at runtime. This saves some memory (about 10 kB
in my real-world test), and the runtime overhead is totally
negligible.
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idea is to have separate indexing for subfeatures with a compute
mapping and for subfeatures without it. They still follow each
other in the big table but this avoids wasting memory due to the
numbering gap between them.
This cuts the amount of memory (temporarily) allocated by
sensors_read_dynamic_chip() almost by half, and also speeds it up
a little as it now takes less iterations to walk the sparse array.
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position N in the array. This allows for O(1) look-ups, as opposed
to O(N) before. This makes sensors_lookup_feature_nr() 2.4 times
faster in my real-world tests, resulting in a 6% performance boost
on average in the runtime part of "sensors".
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feature number as the logical mapping. This means that the compute
mapping can be turned into a simple boolean flag. Doing so makes
struct sensors_feature_data smaller, which saves some memory (about
17 kB in my tests.)
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we need to add "_input" to get the correct sysfs file name. This is
much faster. This is still a ugly hack I'd like to get rid of, but at
least now the slowdown is acceptable.
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sensors_bus_id. This prevents wasting space with padding on 64-bit
systems, saving some memory (128 bytes for sensors_bus_id, nothing
yet for sensors_feature_data but it will come later).
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Jean Delvare