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Date:   Tue, 5 Dec 2017 14:23:00 -0800
From:   Andrew Morton <>
To:     Daniel Jordan <>
Subject: Re: [RFC PATCH v3 0/7] ktask: multithread CPU-intensive kernel work

On Tue,  5 Dec 2017 14:52:13 -0500 Daniel Jordan <> wrote:

> This patchset is based on 4.15-rc2 plus one mmots fix[*] and contains three
> ktask users:
>  - deferred struct page initialization at boot time
>  - clearing gigantic pages
>  - fallocate for HugeTLB pages

Performance improvements are nice.  How much overall impact is there in
real-world worklaods?

> Work in progress:
>  - Parallelizing page freeing in the exit/munmap paths

Also sounds interesting.  Have you identified any other parallelizable
operations?  vfs object teardown at umount time may be one...

>  - CPU hotplug support

Of what?  The ktask infrastructure itself?

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