Re: [RFC v2] mm: add page preemption

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On 29.10.19 13:30, Hillf Danton wrote:

Date: Tue, 29 Oct 2019 09:41:53 +0100 Michal Hocko wrote:

As already raised in the review of v1. There is no real life usecase
described in the changelog.

No feature, no user; no user, no workloads.
No linux-6.x released, no 6.x users.
Are you going to be one of the users of linux-6.0?

Even though, I see a use case over there at
https://lore.kernel.org/lkml/20191023120452.GN754@xxxxxxxxxxxxxx/

That thread terminated because of preemption, showing us how useful
preemption might be in real life.

I have also expressed concerns about how
such a reclaim would work in the first place

Based on what?

(priority inversion,

No prio inversion will happen after introducing prio to global reclaim.

expensive reclaim etc.).

No cost, no earn.



Side note: You should really have a look what your mail client is messing up here. E.g., the reply from Michal correctly had

Message-ID: <20191029084153.GD31513@xxxxxxxxxxxxxx>
References: <20191026112808.14268-1-hdanton@xxxxxxxx>
In-Reply-To: <20191026112808.14268-1-hdanton@xxxxxxxx>

Once you reply to that, you have

Message-Id: <20191029123058.19060-1-hdanton@xxxxxxxx>
In-Reply-To: <20191026112808.14268-1-hdanton@xxxxxxxx>
References:

Instead of

Message-Id: <20191029123058.19060-1-hdanton@xxxxxxxx>
In-Reply-To: <20191029084153.GD31513@xxxxxxxxxxxxxx>
References: <20191029084153.GD31513@xxxxxxxxxxxxxx>

Which flattens the whole thread hierarchy. Nasty. Please fix that.

--

Thanks,

David / dhildenb






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