linux-kernel - Re: [PATCH v24 00/14] Subject: Introduce Data Access MONitor (DAMON)

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Message-ID: <20210304100732.7844-1-sjpark@amazon.com>
Date:   Thu, 4 Mar 2021 11:07:32 +0100
From:   SeongJae Park <sjpark@...zon.com>
To:     SeongJae Park <sjpark@...zon.com>
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Subject: Re: [PATCH v24 00/14] Subject: Introduce Data Access MONitor (DAMON)

On Thu, 4 Feb 2021 16:31:36 +0100 SeongJae Park <sjpark@...zon.com> wrote:

> From: SeongJae Park <sjpark@...zon.de>
[...]
> 
> Introduction
> ============
> 
> DAMON is a data access monitoring framework for the Linux kernel.  The core
> mechanisms of DAMON called 'region based sampling' and 'adaptive regions
> adjustment' (refer to 'mechanisms.rst' in the 11th patch of this patchset for
> the detail) make it
> 
>  - accurate (The monitored information is useful for DRAM level memory
>    management. It might not appropriate for Cache-level accuracy, though.),
>  - light-weight (The monitoring overhead is low enough to be applied online
>    while making no impact on the performance of the target workloads.), and
>  - scalable (the upper-bound of the instrumentation overhead is controllable
>    regardless of the size of target workloads.).
> 
> Using this framework, therefore, several memory management mechanisms such as
> reclamation and THP can be optimized to aware real data access patterns.
> Experimental access pattern aware memory management optimization works that
> incurring high instrumentation overhead will be able to have another try.
> 
> Though DAMON is for kernel subsystems, it can be easily exposed to the user
> space by writing a DAMON-wrapper kernel subsystem.  Then, user space users who
> have some special workloads will be able to write personalized tools or
> applications for deeper understanding and specialized optimizations of their
> systems.
>
[...]
> 
> Baseline and Complete Git Trees
> ===============================
> 
> The patches are based on the v5.10.  You can also clone the complete git
> tree:
> 
>     $ git clone git://github.com/sjp38/linux -b damon/patches/v24
> 
> The web is also available:
> https://github.com/sjp38/linux/releases/tag/damon/patches/v24
> 
> There are a couple of trees for entire DAMON patchset series.  It includes
> future features.  The first one[1] contains the changes for latest release,
> while the other one[2] contains the changes for next release.
> 
> [1] https://github.com/sjp38/linux/tree/damon/master
> [2] https://github.com/sjp38/linux/tree/damon/next

For people who prefer LTS kernels, I decided to maintain two more trees that
repectively based on latest two LTS kernels and contains backports of the
latest 'damon/master' tree, as below.  Please use those if you want to test
DAMON but using LTS.

- For v5.4.y: https://github.com/sjp38/linux/tree/damon/for-v5.4.y
- For v5.10.y: https://github.com/sjp38/linux/tree/damon/for-v5.10.y


Thanks,
SeongJae Park