SFP modules measure the transmit power of the lazer. The sensor has
expected minimum values, and alarms when these minimams are reached.
Add support to sensors to print these.
Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Add support for sysfs attributes temp[1-*]_min_hyst (already
implemented by drivers adt7x10, lm77 and lm92) and
temp[1-*]_lcrit_hyst (no known users yet.)
When gathering the attributes of each hwmon chip, libsensors uses a
temporary structure in memory to order and group all the attributes
into features. This temporary structure used to be a single array with
room for every possible attribute/subfeature. While simple, this
approach required to predefine a maximum number of per-type sensor
that could be handled.
In order to get rid of this arbitrary limit, which we hit and had to
raise three times already, I changed the temporary structure to an
array of dynamically allocated per-type subattribute arrays. This lets
us not allocate any memory for types which aren't implemented by a
given chip, and more importantly, this lets us reallocate room for
more attributes of a given type as needed.
I decided to allocate chunks of 8 attributes at a time, as this seemed
a good compromise between two frequent reallocations and
over-provisioning. It could be tweaked if needed.
Icing on the cake, I benchmarked this change on two different systems
and it results in performance gains. The total heap usage as reported
by valgrind is down by 50% on average, with peak memory consumption
(as reported by valgrind's massif) also down by 43% on average. The
total instructions count (as reported by valgrind's callgrind) is down
by 11% on average, with measured execution time also down by a few
percents. Valgrind rocks, BTW.
I have some ideas to optimize the memory allocations further, but I do
not expect such a huge gain from them. They may not even improve peak
memory consumption as massif shows the peak is somewhere else now at
least in some cases.
attributes. These are defined in the standard sysfs interface for quite
some time, and at least three drivers (max6650, lm63 and applesmc)
implement them so we should support them.
git-svn-id: http://lm-sensors.org/svn/lm-sensors/trunk@6029 7894878c-1315-0410-8ee3-d5d059ff63e0
representation of chip names.
sensord, sensors: Fix a memory leak when one or more chip names are
provided on the command line.
git-svn-id: http://lm-sensors.org/svn/lm-sensors/trunk@5740 7894878c-1315-0410-8ee3-d5d059ff63e0
Ondřej Lysoněk