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[ Upstream commit 9c3bafaa1fd88e4dd2dba3735a1f1abb0f2c7bb7 ] On modern CPUs it is quite normal that the temperature limits are reached and the CPU is throttled. In fact, often the thermal design is not sufficient to cool the CPU at full load and limits can quickly be reached when a burst in load happens. This will even happen with technologies like RAPL limitting the long term power consumption of the package. Also, these limits are "softer", as Srinivas explains: "CPU temperature doesn't have to hit max(TjMax) to get these warnings. OEMs ha[ve] an ability to program a threshold where a thermal interrupt can be generated. In some systems the offset is 20C+ (Read only value). In recent systems, there is another offset on top of it which can be programmed by OS, once some agent can adjust power limits dynamically. By default this is set to low by the firmware, which I guess the prime motivation of Benjamin to submit the patch." So these messages do not usually indicate a hardware issue (e.g. insufficient cooling). Log them as warnings to avoid confusion about their severity. [ bp: Massage commit mesage. ] Signed-off-by: Benjamin Berg <bberg@redhat.com> Signed-off-by: Borislav Petkov <bp@suse.de> Reviewed-by: Hans de Goede <hdegoede@redhat.com> Tested-by: Christian Kellner <ckellner@redhat.com> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: linux-edac <linux-edac@vger.kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Tony Luck <tony.luck@intel.com> Cc: x86-ml <x86@kernel.org> Link: https://lkml.kernel.org/r/20191009155424.249277-1-bberg@redhat.com Signed-off-by: Sasha Levin <sashal@kernel.org> |
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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.