From: Chris Down <chris-6Bi1550iOqEnzZ6mRAm98g@public.gmane.org>
To: Hui Zhu <teawater-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
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Hui Zhu
<teawaterz-KPsoFbNs7GizrGE5bRqYAgC/G2K4zDHf@public.gmane.org>
Subject: Re: [PATCH] mm, memcg: Add memory.transparent_hugepage_disabled
Date: Tue, 24 Mar 2020 13:23:50 +0000 [thread overview]
Message-ID: <20200324132350.GA7528@chrisdown.name> (raw)
In-Reply-To: <1585045916-27339-1-git-send-email-teawater-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Hui Zhu writes:
>/sys/kernel/mm/transparent_hugepage/enabled is the only interface to
>control if the application can use THP in system level.
>Sometime, we would not want an application use THP even if
>transparent_hugepage/enabled is set to "always" or "madvise" because
>thp may need more cpu and memory resources in some cases.
>
>This commit add a new interface memory.transparent_hugepage_disabled
>in memcg.
>When it set to 1, the application inside the cgroup cannot use THP
>except dax.
I'm against this patch even in the abstract -- this adds an extremely niche use
case to a general interface, and there are plenty of ways to already indicate
THP preference.
Perhaps there is some new interface desirable for your use case, but adding a
new global file to memcg certainly isn't it.
prev parent reply other threads:[~2020-03-24 13:23 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-24 10:31 [PATCH] mm, memcg: Add memory.transparent_hugepage_disabled Hui Zhu
2020-03-24 11:00 ` Michal Hocko
[not found] ` <20200324110034.GH19542-2MMpYkNvuYDjFM9bn6wA6Q@public.gmane.org>
2020-03-24 12:30 ` teawater
[not found] ` <816B70EC-20AD-4BB8-AD13-4F5640EBAB35-KPsoFbNs7GizrGE5bRqYAgC/G2K4zDHf@public.gmane.org>
2020-03-24 13:17 ` Michal Hocko
2020-03-24 12:17 ` Kirill A. Shutemov
2020-03-24 19:17 ` David Rientjes
[not found] ` <1585045916-27339-1-git-send-email-teawater-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2020-03-24 13:23 ` Chris Down [this message]
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