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cpacfstats: Handle CPU hotplug

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cpacfstatsd now correctly handles offline cpus and dynamically attaches to
cpus once they get online.  If events are enabled when a hotplug event
occurs, cpacfstatsd uses a pseudo-counter to notify user applications about
the occurence of this event and a potential data inaccuracy.

cpacfstats shows if a hotplug event has been detected since at least one
counter was activated.  As soon as all counters are deactivated, the
hotplug detection state is reset.

Signed-off-by: Juergen Christ <jchrist@linux.ibm.com>
Reviewed-By: Harald Freudenberger <freude@linux.ibm.com>
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
This commit is contained in:
Juergen Christ
2022-04-12 18:08:17 +02:00
committed by Jan Höppner
parent 225964875c
commit 72b5e8b313
7 changed files with 425 additions and 181 deletions
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17
README.md
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@@ -306,7 +306,6 @@ build options:
| | | hsavmcore |
| zlib | `HAVE_ZLIB` | zgetdump, dump2tar |
| ncurses | `HAVE_NCURSES` | hyptop |
| pfm | `HAVE_PFM` | cpacfstats |
| net-snmp | `HAVE_SNMP` | osasnmpd |
| glibc-static | `HAVE_LIBC_STATIC` | zfcpdump |
| openssl | `HAVE_OPENSSL` | genprotimg, zkey, libekmfweb, |
@@ -320,6 +319,7 @@ build options:
| libxml2 | `HAVE_LIBXML2` | libkmipclient |
| systemd | `HAVE_SYSTEMD` | hsavmcore |
| liblockfile | `HAVE_LOCKFILE` | ap-check |
| libudev | `HAVE_LIBUDEV` | cpacfstatsd |
This table lists additional build or install options:
@@ -403,14 +403,13 @@ the different tools are provided:
As of s390-tools-1.13.0, the minimum required kernel level is 2.6.38.
* cpacfstats:
For building the cpacfstats tools you need libpfm version 4 or
newer installed (libpfm-devel.rpm). Tip: you may skip the cpacfstats
build by adding `HAVE_PFN=0` to the make invocation. To run the
cpacfstats daemon the kernel needs to have performance
events enabled (check for `CONFIG_PERF_EVENTS=y`) and you need libpfm
version 4 or newer installed. A new group 'cpacfstats' needs to be
created and all users intending to use the tool should be added to
this group.
For building the cpacfstats tools you need libudev installed
(systemd-devel.rpm). Tip: you may skip the cpacfstats build by
adding `HAVE_LIBUDEV=0` to the make invocation. To run the
cpacfstats daemon the kernel needs to have performance events
enabled (check for `CONFIG_PERF_EVENTS=y`). A new group 'cpacfstats'
needs to be created and all users intending to use the tool should
be added to this group.
* zdev:
Depending on the boot loader and initial RAM-disk mechanism used by a