From 9bba87244d6bbf46e776834d0917b2dd1143f31d Mon Sep 17 00:00:00 2001
From: Bart Van Assche <bvanassche@google.com>
Date: Thu, 28 Sep 2023 15:18:56 -0700
Subject: [PATCH] task_profiles.json: Set io.prio.class

Provide an additional way to request the block layer to prioritize
foreground I/O over background I/O. This patch prepares for tests with
the mq-deadline I/O scheduler. While CFQ and BFQ support a "weight"
cgroup attribute, the mq-deadline scheduler does not. The mq-deadline
I/O scheduler only supports the I/O priority class for differentiating
I/O priorities.

The io.prio.class attribute is declared optional since this attribute
only exists if CONFIG_BLK_CGROUP_IOPRIO != n in the kernel
configuration.

Bug: 186902601
Change-Id: Iee1004cd0996e32245aff2b51772ef40178e024f
Signed-off-by: Bart Van Assche <bvanassche@google.com>
---
 libprocessgroup/profiles/task_profiles.json | 41 +++++++++++++++++++++
 1 file changed, 41 insertions(+)

diff --git a/libprocessgroup/profiles/task_profiles.json b/libprocessgroup/profiles/task_profiles.json
index 2c08b0b31..f2ef316e2 100644
--- a/libprocessgroup/profiles/task_profiles.json
+++ b/libprocessgroup/profiles/task_profiles.json
@@ -91,6 +91,11 @@
       "Name": "CfqWeight",
       "Controller": "io",
       "File": "io.weight"
+    },
+    {
+      "Name": "IoPrioClass",
+      "Controller": "io",
+      "File": "io.prio.class"
     }
   ],
 
@@ -479,6 +484,15 @@
             "Value": "200",
             "Optional": "true"
           }
+        },
+        {
+          "Name": "SetAttribute",
+          "Params":
+          {
+            "Name": "IoPrioClass",
+            "Value": "restrict-to-be",
+            "Optional": "true"
+          }
         }
       ]
     },
@@ -511,6 +525,15 @@
             "Value": "1000",
             "Optional": "true"
           }
+        },
+        {
+          "Name": "SetAttribute",
+          "Params":
+          {
+            "Name": "IoPrioClass",
+            "Value": "restrict-to-be",
+            "Optional": "true"
+          }
         }
       ]
     },
@@ -543,6 +566,15 @@
             "Value": "1000",
             "Optional": "true"
           }
+        },
+        {
+          "Name": "SetAttribute",
+          "Params":
+          {
+            "Name": "IoPrioClass",
+            "Value": "promote-to-rt",
+            "Optional": "true"
+          }
         }
       ]
     },
@@ -575,6 +607,15 @@
             "Value": "1000",
             "Optional": "true"
           }
+        },
+        {
+          "Name": "SetAttribute",
+          "Params":
+          {
+            "Name": "IoPrioClass",
+            "Value": "promote-to-rt",
+            "Optional": "true"
+          }
         }
       ]
     },