x86/intel_rdt: Pseudo-lock region creation/removal core

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The user requests a pseudo-locked region by providing a schemata to a
resource group that is in the pseudo-locksetup mode. This is the
functionality that consumes the parsed user data and creates the
pseudo-locked region.

First, required information is deduced from user provided data.
This includes, how much memory does the requested bitmask represent,
which CPU the requested region is associated with, and what is the
cache line size of that cache (to learn the stride needed for locking).
Second, a contiguous block of memory matching the requested bitmask is
allocated.

Finally, pseudo-locking is performed. The resource group already has the
allocation that reflects the requested bitmask. With this class of service
active and interference minimized, the allocated memory is loaded into the
cache.

Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: fenghua.yu@intel.com
Cc: tony.luck@intel.com
Cc: vikas.shivappa@linux.intel.com
Cc: gavin.hindman@intel.com
Cc: jithu.joseph@intel.com
Cc: dave.hansen@intel.com
Cc: hpa@zytor.com
Link: https://lkml.kernel.org/r/67391160bbf06143bc62d856d3d234eb152008b7.1529706536.git.reinette.chatre@intel.com

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Reinette Chatre 2018-06-22 15:42:21 -07:00 • committed by Thomas Gleixner

parent f2a177292b

commit 018961ae55

2 changed files with 353 additions and 1 deletions

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17

arch/x86/kernel/cpu/intel_rdt.h

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337

arch/x86/kernel/cpu/intel_rdt_pseudo_lock.c

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