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| author |   Tony Luck <tony.luck@intel.com> | 2017-04-03 14:44:16 -0700 |
|---|---|---|
| committer |   Thomas Gleixner <tglx@linutronix.de> | 2017-04-05 17:22:31 +0200 |
| commit | c4026b7b95a4b852e404afa2cd7720866159d118 (patch) | |
| tree | 60089e1fd1ad26b24d915b9e1d82b06092e69ee4 /Documentation/x86/intel_rdt_ui.txt | |
| parent | x86/cpu: Drop wp_works_ok member of struct cpuinfo_x86 (diff) | |
| download | linux-dev-c4026b7b95a4b852e404afa2cd7720866159d118.tar.xz linux-dev-c4026b7b95a4b852e404afa2cd7720866159d118.zip | |
x86/intel_rdt: Implement "update" mode when writing schemata file
The schemata file can have multiple lines and it is cumbersome to update
all lines.
Remove code that requires that the user provides values for every resource
(in the right order). If the user provides values for just a few
resources, update them and leave the rest unchanged.
Side benefit: we now check which values were updated and only send IPIs to
cpus that actually have updates.
Signed-off-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Vikas Shivappa <vikas.shivappa@linux.intel.com>
Tested-by: Sai Praneeth Prakhya <sai.praneeth.prakhya@intel.com>
Cc: ravi.v.shankar@intel.com
Cc: fenghua.yu@intel.com
Cc: peterz@infradead.org
Cc: vikas.shivappa@intel.com
Cc: h.peter.anvin@intel.com
Link: http://lkml.kernel.org/r/1491255857-17213-3-git-send-email-vikas.shivappa@linux.intel.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'Documentation/x86/intel_rdt_ui.txt')
| -rw-r--r-- | Documentation/x86/intel_rdt_ui.txt | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/Documentation/x86/intel_rdt_ui.txt b/Documentation/x86/intel_rdt_ui.txt index 51cf6fa5591f..3ea198460469 100644 --- a/Documentation/x86/intel_rdt_ui.txt +++ b/Documentation/x86/intel_rdt_ui.txt @@ -129,6 +129,20 @@ schemata format is always: L2:<cache_id0>=<cbm>;<cache_id1>=<cbm>;... +Reading/writing the schemata file +--------------------------------- +Reading the schemata file will show the state of all resources +on all domains. When writing you only need to specify those values +which you wish to change. E.g. + +# cat schemata +L3DATA:0=fffff;1=fffff;2=fffff;3=fffff +L3CODE:0=fffff;1=fffff;2=fffff;3=fffff +# echo "L3DATA:2=3c0;" > schemata +# cat schemata +L3DATA:0=fffff;1=fffff;2=3c0;3=fffff +L3CODE:0=fffff;1=fffff;2=fffff;3=fffff + Example 1 --------- On a two socket machine (one L3 cache per socket) with just four bits |