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.
Add process columns showing the elapsed time since the process was
started.
Similar to STARTTIME, but shows the time passed since the process start
instead of the fixed start time of the process.
Closes https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=782636
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.
Refactor the sample time code to make one call to gettimeofday
(aka the realtime clock in clock_gettime, when available) and
one to the monotonic clock. Stores each in more appropriately
named ProcessList fields for ready access when needed. Every
platform gets the opportunity to provide their own clock code,
and the existing Mac OS X specific code is moved below darwin
instead of in Compat.
A couple of leftover time(2) calls are converted to use these
ProcessList fields as well, instead of yet again sampling the
system clock.
Related to https://github.com/htop-dev/htop/pull/574
Follow up on the two items of feedback from cgzones review,
and resolve a build failure picked up by CI on Mac OS X.
Related to https://github.com/htop-dev/htop/pull/564
The libcap code is Linux-specific so move it all below
the linux/ platform subdirectory. As this feature has
custom command-line long options I provide a mechanism
whereby each platform can add custom long options that
augment the main htop options. We'll make use this of
this with the pcp/ platform in due course to implement
the --host and --archive options there.
Related to https://github.com/htop-dev/htop/pull/536
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
Several of our newer meters have merged coding concerns in terms
of extracting values and displaying those values. This commit
rectifies that for the SysArch and Hostname meters, allowing use
of this code with alternative front/back ends. The SysArch code
is also refined to detect whether the platform has an os-release
file at all and/or the sys/utsname.h header via configure.ac.
On Linux kernels the size of the values exported for block
device bytes has used a 64 bit integer for quite some time
(2.6+ IIRC). Make the procfs value extraction use correct
types and change internal types used to rate convert these
counters (within the DiskIO Meter) 64 bit integers, where
appropriate.
On Linux kernels the size of the values exported for network
device bytes and packets has used a 64 bit integer for quite
some time (2.6+ IIRC). Make the procfs value extraction use
correct types and change internal types used to rate convert
these counters (within the NetworkIO Meter) 64 bit integers,
where appropriate.
At start, SysArchMeter calls the uname function to obtain the kernel
version and architecture. If available, the distro version is obtained
by calling lsb_release. The obtained values are stored in static
variables and used when updating the meter.
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;
| ^~
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;
| ^~
According to the Linux kernel documentation, "SwapCached" tracks "memory
that once was swapped out, is swapped back in but still also is
in the swapfile (if memory is needed it doesn't need to be swapped out
AGAIN because it is already in the swapfile. This saves I/O)."
