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6fbd67b0f0
In linux-next tree the many test cases fail on s390x when running the
perf test suite, sometime the perf tool dumps core.
Output before:
6.1: Test event parsing : FAILED!
10.3: Parsing of PMU event table metrics : FAILED!
10.4: Parsing of PMU event table metrics with fake PMUs: FAILED!
17: Setup struct perf_event_attr : FAILED!
24: Number of exit events of a simple workload : FAILED!
26: Object code reading : FAILED!
28: Use a dummy software event to keep tracking : FAILED!
35: Track with sched_switch : FAILED!
42.3: BPF prologue generation : FAILED!
66: Parse and process metrics : FAILED!
68: Event expansion for cgroups : FAILED!
69.2: Perf time to TSC : FAILED!
74: build id cache operations : FAILED!
86: Zstd perf.data compression/decompression : FAILED!
87: perf record tests : FAILED!
106: Test java symbol : FAILED!
The reason for all these failure is a missing PMU. On s390x the PMU is
named cpum_cf which is not detected as core PMU. A similar patch was
added before, see commit
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.