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Subject[PATCH 1/8] Documentation, x86: Intel Memory bandwidth allocation
Date
Update the 'intel_rdt_ui' documentation to have Memory bandwidth(b/w)
allocation interface usage.

Signed-off-by: Vikas Shivappa <vikas.shivappa@linux.intel.com>
---
Documentation/x86/intel_rdt_ui.txt | 107 ++++++++++++++++++++++++++++++-------
1 file changed, 87 insertions(+), 20 deletions(-)

diff --git a/Documentation/x86/intel_rdt_ui.txt b/Documentation/x86/intel_rdt_ui.txt
index 3ea1984..f223a3b 100644
--- a/Documentation/x86/intel_rdt_ui.txt
+++ b/Documentation/x86/intel_rdt_ui.txt
@@ -4,6 +4,7 @@ Copyright (C) 2016 Intel Corporation

Fenghua Yu <fenghua.yu@intel.com>
Tony Luck <tony.luck@intel.com>
+Vikas Shivappa <vikas.shivappa@intel.com>

This feature is enabled by the CONFIG_INTEL_RDT_A Kconfig and the
X86 /proc/cpuinfo flag bits "rdt", "cat_l3" and "cdp_l3".
@@ -22,19 +23,34 @@ Info directory

The 'info' directory contains information about the enabled
resources. Each resource has its own subdirectory. The subdirectory
-names reflect the resource names. Each subdirectory contains the
-following files:
+names reflect the resource names.
+Cache resource(L3/L2) subdirectory contains the following files:

-"num_closids": The number of CLOSIDs which are valid for this
- resource. The kernel uses the smallest number of
- CLOSIDs of all enabled resources as limit.
+"num_closids": The number of CLOSIDs which are valid for this
+ resource. The kernel uses the smallest number of
+ CLOSIDs of all enabled resources as limit.

-"cbm_mask": The bitmask which is valid for this resource. This
- mask is equivalent to 100%.
+"cbm_mask": The bitmask which is valid for this resource.
+ This mask is equivalent to 100%.

-"min_cbm_bits": The minimum number of consecutive bits which must be
- set when writing a mask.
+"min_cbm_bits": The minimum number of consecutive bits which
+ must be set when writing a mask.

+Memory bandwitdh(MB) subdirectory contains the following files:
+
+"min_bandwidth": The minimum memory bandwidth percentage which
+ user can request.
+
+"bandwidth_gran": The granularity in which the memory bandwidth
+ percentage is allocated. The allocated
+ b/w percentage is rounded off to the next
+ control step available on the hardware. The
+ available bandwidth control steps are:
+ min_bandwidth + N * bandwidth_gran.
+
+"delay_linear": Indicates if the delay scale is linear or
+ non-linear. This field is purely informational
+ only.

Resource groups
---------------
@@ -107,6 +123,22 @@ and 0xA are not. On a system with a 20-bit mask each bit represents 5%
of the capacity of the cache. You could partition the cache into four
equal parts with masks: 0x1f, 0x3e0, 0x7c00, 0xf8000.

+Memory bandwidth(b/w) percentage
+--------------------------------
+For Memory b/w resource, user controls the resource by indicating the
+percentage of total memory b/w.
+
+The minimum bandwidth percentage value for each cpu model is predefined
+and can be looked up through "info/MB/min_bandwidth". The bandwidth
+granularity that is allocated is also dependent on the cpu model and can
+be looked up at "info/MB/bandwidth_gran". The available bandwidth
+control steps are: min_bw + N * bw_gran. Intermediate values are rounded
+to the next control step available on the hardware.
+
+The bandwidth throttling is a core specific mechanism on some of Intel
+SKUs. Using a high bandwidth and a low bandwidth setting on two threads
+sharing a core will result in both threads being throttled to use the
+low bandwidth.

L3 details (code and data prioritization disabled)
--------------------------------------------------
@@ -129,6 +161,13 @@ schemata format is always:

L2:<cache_id0>=<cbm>;<cache_id1>=<cbm>;...

+Memory b/w Allocation details
+-----------------------------
+
+Memory b/w domain is L3 cache.
+
+ MB:<cache_id0>=bandwidth0;<cache_id1>=bandwidth1;...
+
Reading/writing the schemata file
---------------------------------
Reading the schemata file will show the state of all resources
@@ -146,13 +185,14 @@ 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
-for cache bit masks
+for cache bit masks, minimum b/w of 10% with a memory bandwidth
+granularity of 10%

# mount -t resctrl resctrl /sys/fs/resctrl
# cd /sys/fs/resctrl
# mkdir p0 p1
-# echo "L3:0=3;1=c" > /sys/fs/resctrl/p0/schemata
-# echo "L3:0=3;1=3" > /sys/fs/resctrl/p1/schemata
+# echo "L3:0=3;1=c\nMB:0=50;1=50" > /sys/fs/resctrl/p0/schemata
+# echo "L3:0=3;1=3\nMB:0=50;1=50" > /sys/fs/resctrl/p1/schemata

The default resource group is unmodified, so we have access to all parts
of all caches (its schemata file reads "L3:0=f;1=f").
@@ -161,6 +201,14 @@ Tasks that are under the control of group "p0" may only allocate from the
"lower" 50% on cache ID 0, and the "upper" 50% of cache ID 1.
Tasks in group "p1" use the "lower" 50% of cache on both sockets.

+Similarly, tasks that are under the control of group "p0" may use a
+maximum memory b/w of 50% on socket0 and 50% on socket 1.
+Tasks in group "p1" may also use 50% memory b/w on both sockets.
+Note that unlike cache masks, memory b/w cannot specify whether these
+allocations can overlap or not. The allocations specifies the maximum
+b/w that the group may be able to use and the system admin can configure
+the b/w accordingly.
+
Example 2
---------
Again two sockets, but this time with a more realistic 20-bit mask.
@@ -174,9 +222,10 @@ of L3 cache on socket 0.
# cd /sys/fs/resctrl

First we reset the schemata for the default group so that the "upper"
-50% of the L3 cache on socket 0 cannot be used by ordinary tasks:
+50% of the L3 cache on socket 0 and 50% of memory b/w cannot be used by
+ordinary tasks:

-# echo "L3:0=3ff;1=fffff" > schemata
+# echo "L3:0=3ff;1=fffff\nMB:0=50;1=100" > schemata

Next we make a resource group for our first real time task and give
it access to the "top" 25% of the cache on socket 0.
@@ -199,6 +248,20 @@ Ditto for the second real time task (with the remaining 25% of cache):
# echo 5678 > p1/tasks
# taskset -cp 2 5678

+For the same 2 socket system with memory b/w resource and CAT L3 the
+schemata would look like(Assume min_bandwidth 10 and bandwidth_gran is
+10):
+
+For our first real time task this would request 20% memory b/w on socket
+0.
+
+# echo -e "L3:0=f8000;1=fffff\nMB:0=20;1=100" > p0/schemata
+
+For our second real time task this would request an other 20% memory b/w
+on socket 0.
+
+# echo -e "L3:0=f8000;1=fffff\nMB:0=20;1=100" > p0/schemata
+
Example 3
---------

@@ -212,18 +275,22 @@ the tasks.
# cd /sys/fs/resctrl

First we reset the schemata for the default group so that the "upper"
-50% of the L3 cache on socket 0 cannot be used by ordinary tasks:
+50% of the L3 cache on socket 0, and 50% of memory bandwidth on socket 0
+cannot be used by ordinary tasks:

-# echo "L3:0=3ff" > schemata
+# echo "L3:0=3ff\nMB:0=50" > schemata

-Next we make a resource group for our real time cores and give
-it access to the "top" 50% of the cache on socket 0.
+Next we make a resource group for our real time cores and give it access
+to the "top" 50% of the cache on socket 0 and 50% of memory bandwidth on
+socket 0.

# mkdir p0
-# echo "L3:0=ffc00;" > p0/schemata
+# echo "L3:0=ffc00\nMB:0=50" > p0/schemata

Finally we move core 4-7 over to the new group and make sure that the
-kernel and the tasks running there get 50% of the cache.
+kernel and the tasks running there get 50% of the cache. They should
+also get 50% of memory bandwidth assuming that the cores 4-7 are SMT
+siblings and only the real time threads are scheduled on the cores 4-7.

# echo C0 > p0/cpus

--
1.9.1
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