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Add a new DynamicMeter class for runtime Meter extension

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This commit is based on exploratory work by Sohaib Mohamed.
The end goal is two-fold - to support addition of Meters we
build via configuration files for both the PCP platform and
for scripts ( https://github.com/htop-dev/htop/issues/526 )

Here, we focus on generic code and the PCP support.  A new
class DynamicMeter is introduced - it uses the special case
'param' field handling that previously was used only by the
CPUMeter, such that every runtime-configured Meter is given
a unique identifier.  Unlike with the CPUMeter this is used
internally only.  When reading/writing to htoprc instead of
CPU(N) - where N is an integer param (CPU number) - we use
the string name for each meter.  For example, if we have a
configuration for a DynamicMeter for some Redis metrics, we
might read and write "Dynamic(redis)".  This identifier is
subsequently matched (back) up to the configuration file so
we're able to re-create arbitrary user configurations.

The PCP platform configuration file format is fairly simple.
We expand configs from several directories, including the
users homedir alongside htoprc (below htop/meters/) and also
/etc/pcp/htop/meters.  The format will be described via a
new pcp-htop(5) man page, but its basically ini-style and
each Meter has one or more metric expressions associated, as
well as specifications for labels, color and so on via a dot
separated notation for individual metrics within the Meter.

A few initial sample configuration files are provided below
./pcp/meters that give the general idea.  The PCP "derived"
metric specification - see pmRegisterDerived(3) - is used
as the syntax for specifying metrics in PCP DynamicMeters.
This commit is contained in:
Nathan Scott
2021-06-23 17:44:56 +10:00
parent 865b85eb2d
commit f0ed0fdafb
48 changed files with 1044 additions and 68 deletions
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15
pcp/Platform.h
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@ -24,6 +24,7 @@ in the source distribution for its full text.
#include "Action.h"
#include "BatteryMeter.h"
#include "DiskIOMeter.h"
#include "Hashtable.h"
#include "Meter.h"
#include "NetworkIOMeter.h"
#include "Process.h"
@ -247,14 +248,26 @@ bool Metric_iterate(Metric metric, int* instp, int* offsetp);
pmAtomValue* Metric_values(Metric metric, pmAtomValue *atom, int count, int type);
const pmDesc* Metric_desc(Metric metric);
int Metric_instanceCount(Metric metric);
int Metric_instanceOffset(Metric metric, int inst);
pmAtomValue *Metric_instance(Metric metric, int inst, int offset, pmAtomValue *atom, int type);
pmAtomValue* Metric_instance(Metric metric, int inst, int offset, pmAtomValue *atom, int type);
int Platform_addMetric(Metric id, const char *name);
void Platform_gettime_realtime(struct timeval* tv, uint64_t* msec);
void Platform_gettime_monotonic(uint64_t* msec);
Hashtable* Platform_dynamicMeters(void);
void Platform_dynamicMeterInit(Meter* meter);
void Platform_dynamicMeterUpdateValues(Meter* meter);
void Platform_dynamicMeterDisplay(const Meter* meter, RichString* out);
#endif