kernel: Enable support for block device writeback throttling (#14797)

rlmenge · web-flow · commit 696854a8b033 · 2025-10-28T17:41:18.000-07:00
Enables CONFIG_BLK_WBT (Writeback Throttling) and CONFIG_BLK_WBT_MQ (Writeback Throttling for Multi-Queue Block Layer) in the kernel configuration.

CONFIG_BLK_WBT introduces the Writeback Throttling mechanism for block devices. WBT helps prevent excessive IO latency spikes caused by uncontrolled writeback activity, especially on storage devices with limited bandwidth or high latency. By throttling background writeback, WBT ensures smoother and more predictable IO performance, particularly under heavy load or when multiple IO streams are competing for device bandwidth.

CONFIG_BLK_WBT_MQ extends WBT support to the multi-queue block subsystem (blk-mq), which is used by modern storage stacks and NVMe devices. Enabling this ensures that WBT's benefits are available for devices managed by blk-mq, providing improved latency control and fairness across all supported block devices.
diff --git a/SPECS-EXTENDED/kernel-ipe/config b/SPECS-EXTENDED/kernel-ipe/config
@@ -947,7 +947,8 @@ CONFIG_BLK_DEV_INTEGRITY_T10=y
 CONFIG_BLK_DEV_ZONED=y
 CONFIG_BLK_DEV_THROTTLING=y
 # CONFIG_BLK_DEV_THROTTLING_LOW is not set
-# CONFIG_BLK_WBT is not set
+CONFIG_BLK_WBT=y
+CONFIG_BLK_WBT_MQ=y
 CONFIG_BLK_CGROUP_IOLATENCY=y
 # CONFIG_BLK_CGROUP_FC_APPID is not set
 # CONFIG_BLK_CGROUP_IOCOST is not set
diff --git a/SPECS-EXTENDED/kernel-ipe/kernel-ipe.signatures.json b/SPECS-EXTENDED/kernel-ipe/kernel-ipe.signatures.json
@@ -1,7 +1,7 @@
 {
   "Signatures": {
     "azurelinux-ca-20230216.pem": "d545401163c75878319f01470455e6bc18a5968e39dd964323225e3fe308849b",
-    "config": "7167905328a60559a0174a83bf9cf901463627e99b213b67357a19d6ec82b5cd",
+    "config": "77447b428d270902d02c064ea477da4b6fe23856db005fe064b8ce40ee742f10",
     "config_aarch64": "e7876afb4c18e809d6d4c25e6dc9bb1ae546e5d9cc1d06e88444201fa70b7ee5",
     "cpupower": "d7518767bf2b1110d146a49c7d42e76b803f45eb8bd14d931aa6d0d346fae985",
     "cpupower.service": "b057fe9e5d0e8c36f485818286b80e3eba8ff66ff44797940e99b1fd5361bb98",
diff --git a/SPECS-EXTENDED/kernel-ipe/kernel-ipe.spec b/SPECS-EXTENDED/kernel-ipe/kernel-ipe.spec
@@ -33,7 +33,7 @@
 Summary:        Linux Kernel
 Name:           kernel-ipe
 Version:        6.6.112.1
-Release:        1%{?dist}
+Release:        2%{?dist}
 License:        GPLv2
 Vendor:         Microsoft Corporation
 Distribution:   Azure Linux
@@ -460,6 +460,9 @@ echo "initrd of kernel %{uname_r} removed" >&2
 %{_sysconfdir}/bash_completion.d/bpftool
 
 %changelog
+* Mon Oct 27 2025 Rachel Menge <rachelmenge@microsoft.com> - 6.6.112.1-2
+- Bump release to match kernel
+
 * Wed Oct 15 2025 CBL-Mariner Servicing Account <cblmargh@microsoft.com> - 6.6.112.1-1
 - Auto-upgrade to 6.6.112.1
 
diff --git a/SPECS-SIGNED/kernel-64k-signed/kernel-64k-signed.spec b/SPECS-SIGNED/kernel-64k-signed/kernel-64k-signed.spec
@@ -7,7 +7,7 @@
 Summary:        Signed Linux Kernel for %{buildarch} systems
 Name:           kernel-64k-signed-%{buildarch}
 Version:        6.6.112.1
-Release:        1%{?dist}
+Release:        2%{?dist}
 License:        GPLv2
 Vendor:         Microsoft Corporation
 Distribution:   Azure Linux
@@ -105,6 +105,9 @@ echo "initrd of kernel %{uname_r} removed" >&2
 %exclude /module_info.ld
 
 %changelog
+* Mon Oct 27 2025 Rachel Menge <rachelmenge@microsoft.com> - 6.6.112.1-2
+- Bump release to match kernel
+
 * Wed Oct 15 2025 CBL-Mariner Servicing Account <cblmargh@microsoft.com> - 6.6.112.1-1
 - Auto-upgrade to 6.6.112.1
 
diff --git a/SPECS-SIGNED/kernel-signed/kernel-signed.spec b/SPECS-SIGNED/kernel-signed/kernel-signed.spec
@@ -10,7 +10,7 @@
 Summary:        Signed Linux Kernel for %{buildarch} systems
 Name:           kernel-signed-%{buildarch}
 Version:        6.6.112.1
-Release:        1%{?dist}
+Release:        2%{?dist}
 License:        GPLv2
 Vendor:         Microsoft Corporation
 Distribution:   Azure Linux
@@ -145,6 +145,9 @@ echo "initrd of kernel %{uname_r} removed" >&2
 %exclude /module_info.ld
 
 %changelog
+* Mon Oct 27 2025 Rachel Menge <rachelmenge@microsoft.com> - 6.6.112.1-2
+- Bump release to match kernel
+
 * Wed Oct 15 2025 CBL-Mariner Servicing Account <cblmargh@microsoft.com> - 6.6.112.1-1
 - Auto-upgrade to 6.6.112.1
 
diff --git a/SPECS-SIGNED/kernel-uki-signed/kernel-uki-signed.spec b/SPECS-SIGNED/kernel-uki-signed/kernel-uki-signed.spec
@@ -6,7 +6,7 @@
 Summary:        Signed Unified Kernel Image for %{buildarch} systems
 Name:           kernel-uki-signed-%{buildarch}
 Version:        6.6.112.1
-Release:        1%{?dist}
+Release:        2%{?dist}
 License:        GPLv2
 Vendor:         Microsoft Corporation
 Distribution:   Azure Linux
@@ -68,6 +68,9 @@ popd
 /boot/efi/EFI/Linux/vmlinuz-uki-%{kernelver}.efi
 
 %changelog
+* Mon Oct 27 2025 Rachel Menge <rachelmenge@microsoft.com> - 6.6.112.1-2
+- Bump release to match kernel
+
 * Wed Oct 15 2025 CBL-Mariner Servicing Account <cblmargh@microsoft.com> - 6.6.112.1-1
 - Auto-upgrade to 6.6.112.1
 
diff --git a/SPECS/kernel-64k/kernel-64k.spec b/SPECS/kernel-64k/kernel-64k.spec
@@ -27,7 +27,7 @@
 Summary:        Linux Kernel
 Name:           kernel-64k
 Version:        6.6.112.1
-Release:        1%{?dist}
+Release:        2%{?dist}
 License:        GPLv2
 Vendor:         Microsoft Corporation
 Distribution:   Azure Linux
@@ -380,6 +380,9 @@ echo "initrd of kernel %{uname_r} removed" >&2
 %{_sysconfdir}/bash_completion.d/bpftool
 
 %changelog
+* Mon Oct 27 2025 Rachel Menge <rachelmenge@microsoft.com> - 6.6.112.1-2
+- Bump release to match kernel
+
 * Wed Oct 15 2025 CBL-Mariner Servicing Account <cblmargh@microsoft.com> - 6.6.112.1-1
 - Auto-upgrade to 6.6.112.1
 
diff --git a/SPECS/kernel-headers/kernel-headers.spec b/SPECS/kernel-headers/kernel-headers.spec
@@ -14,7 +14,7 @@
 Summary:        Linux API header files
 Name:           kernel-headers
 Version:        6.6.112.1
-Release:        1%{?dist}
+Release:        2%{?dist}
 License:        GPLv2
 Vendor:         Microsoft Corporation
 Distribution:   Azure Linux
@@ -75,6 +75,9 @@ done
 %endif
 
 %changelog
+* Mon Oct 27 2025 Rachel Menge <rachelmenge@microsoft.com> - 6.6.112.1-2
+- Bump release to match kernel
+
 * Wed Oct 15 2025 CBL-Mariner Servicing Account <cblmargh@microsoft.com> - 6.6.112.1-1
 - Auto-upgrade to 6.6.112.1
 
diff --git a/SPECS/kernel/config b/SPECS/kernel/config
@@ -947,7 +947,8 @@ CONFIG_BLK_DEV_INTEGRITY_T10=y
 CONFIG_BLK_DEV_ZONED=y
 CONFIG_BLK_DEV_THROTTLING=y
 # CONFIG_BLK_DEV_THROTTLING_LOW is not set
-# CONFIG_BLK_WBT is not set
+CONFIG_BLK_WBT=y
+CONFIG_BLK_WBT_MQ=y
 CONFIG_BLK_CGROUP_IOLATENCY=y
 # CONFIG_BLK_CGROUP_FC_APPID is not set
 # CONFIG_BLK_CGROUP_IOCOST is not set
diff --git a/SPECS/kernel/kernel-uki.spec b/SPECS/kernel/kernel-uki.spec
@@ -13,7 +13,7 @@
 Summary:        Unified Kernel Image
 Name:           kernel-uki
 Version:        6.6.112.1
-Release:        1%{?dist}
+Release:        2%{?dist}
 License:        GPLv2
 Vendor:         Microsoft Corporation
 Distribution:   Azure Linux
@@ -70,6 +70,9 @@ cp %{buildroot}/boot/vmlinuz-uki-%{kernelver}.efi %{buildroot}/boot/efi/EFI/Linu
 /boot/efi/EFI/Linux/vmlinuz-uki-%{kernelver}.efi
 
 %changelog
+* Mon Oct 27 2025 Rachel Menge <rachelmenge@microsoft.com> - 6.6.112.1-2
+- Bump release to match kernel
+
 * Wed Oct 15 2025 CBL-Mariner Servicing Account <cblmargh@microsoft.com> - 6.6.112.1-1
 - Auto-upgrade to 6.6.112.1
 
diff --git a/SPECS/kernel/kernel.signatures.json b/SPECS/kernel/kernel.signatures.json
@@ -1,7 +1,7 @@
 {
   "Signatures": {
     "azurelinux-ca-20230216.pem": "d545401163c75878319f01470455e6bc18a5968e39dd964323225e3fe308849b",
-    "config": "7167905328a60559a0174a83bf9cf901463627e99b213b67357a19d6ec82b5cd",
+    "config": "77447b428d270902d02c064ea477da4b6fe23856db005fe064b8ce40ee742f10",
     "config_aarch64": "e7876afb4c18e809d6d4c25e6dc9bb1ae546e5d9cc1d06e88444201fa70b7ee5",
     "cpupower": "d7518767bf2b1110d146a49c7d42e76b803f45eb8bd14d931aa6d0d346fae985",
     "cpupower.service": "b057fe9e5d0e8c36f485818286b80e3eba8ff66ff44797940e99b1fd5361bb98",
diff --git a/SPECS/kernel/kernel.spec b/SPECS/kernel/kernel.spec
@@ -32,7 +32,7 @@
 Summary:        Linux Kernel
 Name:           kernel
 Version:        6.6.112.1
-Release:        1%{?dist}
+Release:        2%{?dist}
 License:        GPLv2
 Vendor:         Microsoft Corporation
 Distribution:   Azure Linux
@@ -440,6 +440,9 @@ echo "initrd of kernel %{uname_r} removed" >&2
 %{_sysconfdir}/bash_completion.d/bpftool
 
 %changelog
+* Mon Oct 27 2025 Rachel Menge <rachelmenge@microsoft.com> - 6.6.112.1-2
+- Enable writeback throttling and MQ
+
 * Wed Oct 15 2025 CBL-Mariner Servicing Account <cblmargh@microsoft.com> - 6.6.112.1-1
 - Auto-upgrade to 6.6.112.1
 
diff --git a/toolkit/resources/manifests/package/pkggen_core_aarch64.txt b/toolkit/resources/manifests/package/pkggen_core_aarch64.txt
@@ -1,5 +1,5 @@
 filesystem-1.1-21.azl3.aarch64.rpm
-kernel-headers-6.6.112.1-1.azl3.noarch.rpm
+kernel-headers-6.6.112.1-2.azl3.noarch.rpm
 glibc-2.38-15.azl3.aarch64.rpm
 glibc-devel-2.38-15.azl3.aarch64.rpm
 glibc-i18n-2.38-15.azl3.aarch64.rpm
diff --git a/toolkit/resources/manifests/package/pkggen_core_x86_64.txt b/toolkit/resources/manifests/package/pkggen_core_x86_64.txt
@@ -1,5 +1,5 @@
 filesystem-1.1-21.azl3.x86_64.rpm
-kernel-headers-6.6.112.1-1.azl3.noarch.rpm
+kernel-headers-6.6.112.1-2.azl3.noarch.rpm
 glibc-2.38-15.azl3.x86_64.rpm
 glibc-devel-2.38-15.azl3.x86_64.rpm
 glibc-i18n-2.38-15.azl3.x86_64.rpm
diff --git a/toolkit/resources/manifests/package/toolchain_aarch64.txt b/toolkit/resources/manifests/package/toolchain_aarch64.txt
@@ -158,7 +158,7 @@ intltool-0.51.0-7.azl3.noarch.rpm
 itstool-2.0.7-1.azl3.noarch.rpm
 kbd-2.2.0-2.azl3.aarch64.rpm
 kbd-debuginfo-2.2.0-2.azl3.aarch64.rpm
-kernel-headers-6.6.112.1-1.azl3.noarch.rpm
+kernel-headers-6.6.112.1-2.azl3.noarch.rpm
 kmod-30-1.azl3.aarch64.rpm
 kmod-debuginfo-30-1.azl3.aarch64.rpm
 kmod-devel-30-1.azl3.aarch64.rpm
diff --git a/toolkit/resources/manifests/package/toolchain_x86_64.txt b/toolkit/resources/manifests/package/toolchain_x86_64.txt
@@ -165,8 +165,8 @@ intltool-0.51.0-7.azl3.noarch.rpm
 itstool-2.0.7-1.azl3.noarch.rpm
 kbd-2.2.0-2.azl3.x86_64.rpm
 kbd-debuginfo-2.2.0-2.azl3.x86_64.rpm
-kernel-cross-headers-6.6.112.1-1.azl3.noarch.rpm
-kernel-headers-6.6.112.1-1.azl3.noarch.rpm
+kernel-cross-headers-6.6.112.1-2.azl3.noarch.rpm
+kernel-headers-6.6.112.1-2.azl3.noarch.rpm
 kmod-30-1.azl3.x86_64.rpm
 kmod-debuginfo-30-1.azl3.x86_64.rpm
 kmod-devel-30-1.azl3.x86_64.rpm

Original file line number	Diff line number	Diff line change
`@@ -1,7 +1,7 @@`
`1`	`1`	`{`
`2`	`2`	`"Signatures": {`
`3`	`3`	`"azurelinux-ca-20230216.pem": "d545401163c75878319f01470455e6bc18a5968e39dd964323225e3fe308849b",`
`4`		`- "config": "7167905328a60559a0174a83bf9cf901463627e99b213b67357a19d6ec82b5cd",`
	`4`	`+ "config": "77447b428d270902d02c064ea477da4b6fe23856db005fe064b8ce40ee742f10",`
`5`	`5`	`"config_aarch64": "e7876afb4c18e809d6d4c25e6dc9bb1ae546e5d9cc1d06e88444201fa70b7ee5",`
`6`	`6`	`"cpupower": "d7518767bf2b1110d146a49c7d42e76b803f45eb8bd14d931aa6d0d346fae985",`
`7`	`7`	`"cpupower.service": "b057fe9e5d0e8c36f485818286b80e3eba8ff66ff44797940e99b1fd5361bb98",`