Currently htop does not support offline CPUs and hot-swapping, e.g. via
echo 0 > /sys/devices/system/cpu/cpu2/online
Split the current single cpuCount variable into activeCPUs and
existingCPUs.
Supersedes: #650
Related: #580
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.
freebsd/FreeBSDProcessList.c:252:47: runtime error: unsigned integer overflow: 0 - 1 cannot be represented in type 'unsigned int'
#0 0x397c32 in FreeBSDProcessList_scanCPU /root/workspace/htop/htop/freebsd/FreeBSDProcessList.c:252:47
#1 0x38fe76 in ProcessList_goThroughEntries /root/workspace/htop/htop/freebsd/FreeBSDProcessList.c:438:4
#2 0x35ef9a in ProcessList_scan /root/workspace/htop/htop/ProcessList.c:618:4
#3 0x31ee9e in main /root/workspace/htop/htop/htop.c:468:4
#4 0x26bbcf in _start /usr/src/lib/csu/amd64/crt1.c:76:7
* Rename internal identifier from TTY_NR to just TTY
* Unify column header on platforms
* Use devname(3) on BSD derivate to show the actual terminal,
simplifies current FreeBSD implementation.
* Use 'unsigned long int' as id type, to fit dev_t on Linux.
Only on Solaris the terminal path is not yet resolved.
Code that is shared across some (but not all) platforms
is moved into a 'generic' home. Makefile.am cleanups to
match plus some minor alphabetic reordering/formatting.
As discussed in https://github.com/htop-dev/htop/pull/553
strcasestr(3) is a GNU extension and when compiling freebsd/Platform.c
on kfreebsd for Debian <string.h> is included before we define
_GNU_SOURCE, so the function is not available.
In file included from ./Object.h:16,
from ./ListItem.h:12,
from ./Meter.h:16,
from ./Header.h:10,
from ./Action.h:15,
from freebsd/Platform.h:13,
from freebsd/Platform.c:8:
./XUtils.h: In function ‘String_contains_i’:
./XUtils.h:43:11: warning: implicit declaration of function ‘strcasestr’; did you mean ‘strcasecmp’? [-Wimplicit-function-declaration]
43 | return strcasestr(s1, s2) != NULL;
| ^~~~~~~~~~
| strcasecmp
./XUtils.h:43:30: warning: comparison between pointer and integer
43 | return strcasestr(s1, s2) != NULL;
| ^~
In file included from ./Object.h:16,
from ./ProcessList.h:16,
from freebsd/FreeBSDProcessList.h:15,
from freebsd/FreeBSDProcessList.c:8:
./XUtils.h: In function ‘String_contains_i’:
./XUtils.h:43:11: warning: implicit declaration of function ‘strcasestr’; did you mean ‘strcasecmp’? [-Wimplicit-function-declaration]
43 | return strcasestr(s1, s2) != NULL;
| ^~~~~~~~~~
| strcasecmp
./XUtils.h:43:30: warning: comparison between pointer and integer
43 | return strcasestr(s1, s2) != NULL;
| ^~
By storing the per-process m_resident and m_virt values in the form
htop wants to display them in (KB, not pages), we no longer need to
have definitions of pageSize and pageSizeKB in the common CRT code.
These variables were never really CRT (i.e. display) related in the
first place. It turns out the darwin platform code doesn't need to
use these at all (the process values are extracted from the kernel
in bytes not pages) and the other platforms can each use their own
local pagesize variables, in more appropriate locations.
Some platforms were actually already doing this, so this change is
removing duplication of logic and variables there.
The global ProcessList structure contains a couple of unused
fields. 'sharedMem' has never been used by any Meter, since
its not been anything other than zero in Linux /proc/meminfo
for many, many years. The freeMem field is only used in the
usedMem calculation, so it can reside on the stack like some
other memory variables used within-calculations-only and not
exposed to the user via a Meter.
Christian Göttsche