enable DAMON on x86_64 by AZaugg · Pull Request #18050 · microsoft/azurelinux

AZaugg · 2026-07-17T15:56:23Z

Enable the Data Access Monitoring framework in the x86_64 kernel config:
CONFIG_DAMON=y
CONFIG_DAMON_VADDR=y # virtual-address-space monitoring
CONFIG_DAMON_PADDR=y # physical-address-space monitoring
CONFIG_DAMON_SYSFS=y # sysfs control interface
DAMON_RECLAIM/LRU_SORT/STAT are left off (opt-in). The sub-options are
declared explicitly so process_configs.sh (olddefconfig + listnewconfig)
stays consistent now that the parent exposes them. Source and rendered
config kept in sync via the verbatim config overlay; kernel.lock
input-fingerprint refreshed via 'azldev comp update -p kernel'.

azure-pipelines · 2026-07-17T15:56:32Z

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github-actions · 2026-07-17T15:56:45Z

Hello, and thank you for opening this pull request! 👋🏼 We appreciate the contribution.

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Copilot

Pull request overview

Enables DAMON monitoring and its sysfs interface for the x86_64 Azure Linux kernel.

Changes:

Enables DAMON virtual and physical address monitoring.
Keeps optional DAMON policies disabled.
Synchronizes rendered configuration and refreshes the lock fingerprint.

Reviewed changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated no comments.

File	Description
`base/comps/kernel/6.18-x86_64-azl.config`	Enables DAMON for x86_64.
`specs/k/kernel/6.18-x86_64-azl.config`	Synchronizes rendered configuration.
`locks/kernel.lock`	Refreshes the component fingerprint.

Copilot

Pull request overview

Copilot reviewed 5 out of 6 changed files in this pull request and generated 1 comment.

 CONFIG_INFINIBAND_ADDR_TRANS_CONFIGFS=y
 CONFIG_INFINIBAND_VIRT_DMA=y
-# CONFIG_INFINIBAND_BNXT_RE is not set
+CONFIG_INFINIBAND_BNXT_RE=m


reubeno

I'm not familiar with this particular kernel feature; I'd find it helpful to understand what use case you have in mind, whether there's runtime performance overhead of being enabled (but not activated), etc.

(FWIW -- It looks like this feature wasn't enabled in Azure Linux 3.0, and there's a mix of enablement/disablement across some other distros.)

reubeno · 2026-07-17T16:50:10Z

 # Data Access Monitoring
 #
-# CONFIG_DAMON is not set
+CONFIG_DAMON=y


Is there a reason this PR proposes enabling only on x86_64 and not also aarch64?

I can enable it for arm as well. Was not sure if kernel configs were suppose to be mirrored, figured it was a task, only for x86 from my isde

Let's mirror to both here and align with Fedora on these configs

reubeno · 2026-07-17T16:51:56Z

 CONFIG_INFINIBAND_ADDR_TRANS_CONFIGFS=y
 CONFIG_INFINIBAND_VIRT_DMA=y
-# CONFIG_INFINIBAND_BNXT_RE is not set
+CONFIG_INFINIBAND_BNXT_RE=m


Is this intended as a stacked PR on top of your other one that enables this option?

Yes, given the config was hashed, i wanted to avoid having to regenerate the hash after the bntx module was merged.

Set CONFIG_INFINIBAND_BNXT_RE=m, reenabling RDMA support on Broadcom NetXtream NICS

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Enable the Data Access Monitoring framework in the x86_64 kernel config: CONFIG_DAMON=y CONFIG_DAMON_VADDR=y # virtual-address-space monitoring CONFIG_DAMON_PADDR=y # physical-address-space monitoring CONFIG_DAMON_SYSFS=y # sysfs control interface DAMON_RECLAIM/LRU_SORT/STAT are left off (opt-in actuators). The sub-options are declared explicitly so process_configs.sh (olddefconfig + listnewconfig) stays consistent now that the parent exposes them. Bumps azl_pkgrelease to 7 with a matching changelog entry; stacked on top of the bnxt_re-enable change (release 6). Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Copilot

Pull request overview

Copilot reviewed 5 out of 6 changed files in this pull request and generated 1 comment.

 CONFIG_INFINIBAND_ADDR_TRANS_CONFIGFS=y
 CONFIG_INFINIBAND_VIRT_DMA=y
-# CONFIG_INFINIBAND_BNXT_RE is not set
+CONFIG_INFINIBAND_BNXT_RE=m


AZaugg · 2026-07-17T17:28:56Z

I'm not familiar with this particular kernel feature; I'd find it helpful to understand what use case you have in mind, whether there's runtime performance overhead of being enabled (but not activated), etc.

(FWIW -- It looks like this feature wasn't enabled in Azure Linux 3.0, and there's a mix of enablement/disablement across some other distros.)

Hey @reubeno
check out https://docs.kernel.org/mm/damon/index.html

Wanted to use it to profile applications and see if we can use this telemetry to better right size them(memory footprint). Well thats the idea. All the auto reclaim options were left off, only flipped the observability side.

Copilot AI review requested due to automatic review settings July 17, 2026 15:56

AZaugg requested a review from a team as a code owner July 17, 2026 15:56

Copilot started reviewing on behalf of AZaugg July 17, 2026 15:56 View session

Copilot AI reviewed Jul 17, 2026

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AZaugg force-pushed the azaugg/4.0/config-damon-enable branch from 0011d8e to efb816c Compare July 17, 2026 16:46

Copilot AI review requested due to automatic review settings July 17, 2026 16:46

Copilot started reviewing on behalf of AZaugg July 17, 2026 16:46 View session

Copilot AI reviewed Jul 17, 2026

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Comment thread base/comps/kernel/6.18-x86_64-azl.config

CONFIG_INFINIBAND_ADDR_TRANS_CONFIGFS=y

CONFIG_INFINIBAND_VIRT_DMA=y

# CONFIG_INFINIBAND_BNXT_RE is not set

CONFIG_INFINIBAND_BNXT_RE=m

reubeno reviewed Jul 17, 2026

View reviewed changes

AZaugg and others added 4 commits July 17, 2026 12:59

enable Broadcom RoCE driver (bnxt_re) as module on x86_64

8d70d60

Set CONFIG_INFINIBAND_BNXT_RE=m, reenabling RDMA support on Broadcom NetXtream NICS

Update package metadata bumping azl_pkgrelease and changelog entry

7d4de2f

Update kernel lock input-fingerprint

496ed37

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Copilot AI review requested due to automatic review settings July 17, 2026 17:01

AZaugg force-pushed the azaugg/4.0/config-damon-enable branch from efb816c to eeffd0f Compare July 17, 2026 17:01

Copilot started reviewing on behalf of AZaugg July 17, 2026 17:01 View session

Copilot AI reviewed Jul 17, 2026

View reviewed changes

Comment thread base/comps/kernel/6.18-x86_64-azl.config

CONFIG_INFINIBAND_ADDR_TRANS_CONFIGFS=y

CONFIG_INFINIBAND_VIRT_DMA=y

# CONFIG_INFINIBAND_BNXT_RE is not set

CONFIG_INFINIBAND_BNXT_RE=m

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enable DAMON on x86_64 #18050

enable DAMON on x86_64 #18050
AZaugg wants to merge 4 commits into
microsoft:4.0from
AZaugg:azaugg/4.0/config-damon-enable

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