How to add LMK(low memory killer) support to any kernel?

[İlhan Atahan]

Hi to everyone;

This feature is supported by kernel 4.19.7.

I am thinking of using this feature with other kernels.

I opened a topic because I did not know enough about it, can you help me?

[Antony Stone]

This sounds like a question you should ask on a Linux kernel (developers')
mailing list.

It's nothing Android-specific, so I don't think you're going to find most of the
people with that expertise here.


Antony.

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please *don't* CC me.

[Rahul Jain]

On Sat, 20 Jun, 2020, 7:47 PM İlhan Atahan, <ata.ilhan...@gmail.com> wrote:

Hi to everyone;

This feature is supported by kernel 4.19.7.

I am thinking of using this feature with other kernels.

I am not an expert but You may find good read from - 

https://source.android.com/devices/tech/perf/lmkd#using_userspace_lmkd

As per it from 4.12 kernel it is removed from kernel space and userspace take care of it. 

Below config may enable in kernel driver. 

CONFIG_ANDROID_LOW_MEMORY_KILLER=y

I opened a topic because I did not know enough about it, can you help me?

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[İlhan Atahan]

Thank you Anthony. I think this is an android feature.

20 Haziran 2020 Cumartesi 17:48:20 UTC+3 tarihinde Antony Stone yazdı:

[İlhan Atahan]

Also, I am not an expert.So i started this topic.Thank you.

20 Haziran 2020 Cumartesi 18:52:40 UTC+3 tarihinde Rahul Jain yazdı:

On Sat, 20 Jun, 2020, 7:47 PM İlhan Atahan, <ata.ilha...@gmail.com> wrote:

Hi to everyone;

This feature is supported by kernel 4.19.7.

I am thinking of using this feature with other kernels.

I am not an expert but You may find good read from - 

https://source.android.com/devices/tech/perf/lmkd#using_userspace_lmkd

As per it from 4.12 kernel it is removed from kernel space and userspace take care of it. 

Below config may enable in kernel driver. 

CONFIG_ANDROID_LOW_MEMORY_KILLER=y

I opened a topic because I did not know enough about it, can you help me?

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[Chih-Wei Huang]

LMK was developed by Google for Android (only).
However, its design was obviously objected by the
upstream developers so it was removed from the
mainline kernel since 2017.

Google has developed the userspace low memory killer daemon (lmkd)
to replace the in-kernel lmk driver, as Rahul pointed out.
In short, the driver was deprecated.
So why do you still want to use it?


İlhan Atahan <ata.ilhan...@gmail.com> 於 2020年6月21日 週日 上午1:32寫道：

[İlhan Atahan]

2GB Ram is not enough for me😀.

I use swap disk, but lmk can reduce swap need.

[spin877]

echo 3 > /proc/sys/vm/drop_caches

[İlhan Atahan]

What does it do? Spin877

[spin877]

free up some RAM. useful only for devices with 2gb RAM. I use it in a script on my Chinese tablet with low RAM

[İlhan Atahan]

Thanks, this might work for me (spin877).

I still don't know what to do for lmk