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| author | Reinette Chatre <reinette.chatre@intel.com> | 2018-06-22 15:42:30 -0700 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2018-06-24 15:35:48 +0200 |
| commit | 6fc0de37f663278af160e8e1f0c38b27e6c06206 (patch) | |
| tree | 2001f39bf5a067d0c43d2576f24ba6a2191999d7 /arch/x86/kernel/cpu/intel_rdt.h | |
| parent | f3be1e7b2cf8bc096386a3588fc640b0db6b28d7 (diff) | |
| download | linux-6fc0de37f663278af160e8e1f0c38b27e6c06206.tar.gz linux-6fc0de37f663278af160e8e1f0c38b27e6c06206.tar.bz2 linux-6fc0de37f663278af160e8e1f0c38b27e6c06206.zip | |
x86/intel_rdt: Limit C-states dynamically when pseudo-locking active
Deeper C-states impact cache content through shrinking of the cache or
flushing entire cache to memory before reducing power to the cache.
Deeper C-states will thus negatively impact the pseudo-locked regions.
To avoid impacting pseudo-locked regions C-states are limited on
pseudo-locked region creation so that cores associated with the
pseudo-locked region are prevented from entering deeper C-states.
This is accomplished by requesting a CPU latency target which will
prevent the core from entering C6 across all supported platforms.
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/1ef4f99dd6ba12fa6fb44c5a1141e75f952b9cd9.1529706536.git.reinette.chatre@intel.com
Diffstat (limited to 'arch/x86/kernel/cpu/intel_rdt.h')
| -rw-r--r-- | arch/x86/kernel/cpu/intel_rdt.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/x86/kernel/cpu/intel_rdt.h b/arch/x86/kernel/cpu/intel_rdt.h index b8e490a43290..2d9cbb9d7a58 100644 --- a/arch/x86/kernel/cpu/intel_rdt.h +++ b/arch/x86/kernel/cpu/intel_rdt.h @@ -142,6 +142,7 @@ struct mongroup { * region * @debugfs_dir: pointer to this region's directory in the debugfs * filesystem + * @pm_reqs: Power management QoS requests related to this region */ struct pseudo_lock_region { struct rdt_resource *r; @@ -155,6 +156,7 @@ struct pseudo_lock_region { void *kmem; unsigned int minor; struct dentry *debugfs_dir; + struct list_head pm_reqs; }; /** |