diff options
author | Nathan Scott <nathans@redhat.com> | 2021-06-23 17:44:56 +1000 |
---|---|---|
committer | Nathan Scott <nathans@redhat.com> | 2021-07-07 10:59:36 +1000 |
commit | f0ed0fdafb9ecefc9d103ffb8f5d91bf723518f6 (patch) | |
tree | 8f82bf54c96a07d8efa5c9a8bd2c50865bd6757a /Header.c | |
parent | 865b85eb2d31321e9c37334838fa514ac348d61a (diff) |
Add a new DynamicMeter class for runtime Meter extension
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.
Diffstat (limited to 'Header.c')
-rw-r--r-- | Header.c | 17 |
1 files changed, 13 insertions, 4 deletions
@@ -13,6 +13,8 @@ in the source distribution for its full text. #include <string.h> #include "CRT.h" +#include "CPUMeter.h" +#include "DynamicMeter.h" #include "Macros.h" #include "Object.h" #include "Platform.h" @@ -70,7 +72,10 @@ void Header_writeBackToSettings(const Header* this) { for (int i = 0; i < len; i++) { const Meter* meter = (Meter*) Vector_get(vec, i); char* name; - if (meter->param) { + if (meter->param && As_Meter(meter) == &DynamicMeter_class) { + const char* dynamic = DynamicMeter_lookup(this->pl, meter->param); + xAsprintf(&name, "%s(%s)", As_Meter(meter)->name, dynamic); + } else if (meter->param && As_Meter(meter) == &CPUMeter_class) { xAsprintf(&name, "%s(%u)", As_Meter(meter)->name, meter->param); } else { xAsprintf(&name, "%s", As_Meter(meter)->name); @@ -87,9 +92,13 @@ MeterModeId Header_addMeterByName(Header* this, const char* name, int column) { char* paren = strchr(name, '('); unsigned int param = 0; if (paren) { - int ok = sscanf(paren, "(%10u)", ¶m); - if (!ok) - param = 0; + char* end, dynamic[32] = {0}; + int ok = sscanf(paren, "(%10u)", ¶m); // CPUMeter + if (!ok) { + ok = sscanf(paren, "(%30s)", dynamic); // DynamicMeter + if (ok && (end = strrchr(dynamic, ')'))) *end = '\0'; + param = ok ? DynamicMeter_search(this->pl, dynamic) : 0; + } *paren = '\0'; } MeterModeId mode = TEXT_METERMODE; |