linux-kernel - Re: [RFC PATCH v3 0/7] ktask: multithread CPU-intensive kernel work

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Message-Id: <20171205142300.67489b1a90605e1089c5aaa9@linux-foundation.org>
Date:   Tue, 5 Dec 2017 14:23:00 -0800
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Daniel Jordan <daniel.m.jordan@...cle.com>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        aaron.lu@...el.com, dave.hansen@...ux.intel.com,
        mgorman@...hsingularity.net, mhocko@...nel.org,
        mike.kravetz@...cle.com, pasha.tatashin@...cle.com,
        steven.sistare@...cle.com, tim.c.chen@...el.com
Subject: Re: [RFC PATCH v3 0/7] ktask: multithread CPU-intensive kernel work

On Tue,  5 Dec 2017 14:52:13 -0500 Daniel Jordan <daniel.m.jordan@...cle.com> 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?