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Namhyung Kim b2abcb8986 perf tools: Fix missing feature check for inherit + SAMPLE_READ 
[ Upstream commit 367377f45c ]

It should also have PERF_SAMPLE_TID to enable inherit and PERF_SAMPLE_READ
on recent kernels.  Not having _TID makes the feature check wrongly detect
the inherit and _READ support.

It was reported that the following command failed due to the error in
the missing feature check on Intel SPR machines.

  $ perf record -e '{cpu/mem-loads-aux/S,cpu/mem-loads,ldlat=3/PS}' -- ls
  Error:
  Failure to open event 'cpu/mem-loads,ldlat=3/PS' on PMU 'cpu' which will be removed.
  Invalid event (cpu/mem-loads,ldlat=3/PS) in per-thread mode, enable system wide with '-a'.

Reviewed-by: Ian Rogers <irogers@google.com>
Fixes: 3b193a57ba ("perf tools: Detect missing kernel features properly")
Reported-and-tested-by: Chen, Zide <zide.chen@intel.com>
Closes: https://lore.kernel.org/lkml/20251022220802.1335131-1-zide.chen@intel.com/
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2025-12-18 14:02:57 +01:00
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README

README 

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 reStructuredText 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.