From:   SeongJae Park <sj@kernel.org>
To:     Oleksandr Natalenko <oleksandr@natalenko.name>
Cc:     akpm@linux-foundation.org, SeongJae Park <sj@kernel.org>,
        Jonathan.Cameron@huawei.com, amit@kernel.org,
        benh@kernel.crashing.org, corbet@lwn.net, david@redhat.com,
        dwmw@amazon.com, elver@google.com, foersleo@amazon.de,
        gthelen@google.com, markubo@amazon.de, rientjes@google.com,
        shakeelb@google.com, shuah@kernel.org, linux-damon@amazon.com,
        linux-mm@kvack.org, linux-doc@vger.kernel.org,
        linux-kernel@vger.kernel.org
Subject: Re: [PATCH 00/15] Introduce DAMON-based Proactive Reclamation
Date:   Tue, 23 Nov 2021 08:36:36 +0000
Message-Id: <20211123083636.5603-1-sj@kernel.org>
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In-Reply-To: <11868371.O9o76ZdvQC@natalenko.name>
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Hello Oleksandr,

On Sun, 21 Nov 2021 23:32:12 +0100 Oleksandr Natalenko <oleksandr@natalenko.name> wrote:

> Hello.
> 
> On úterý 19. října 2021 17:07:16 CET SeongJae Park wrote:
> > In short, DAMON_RECLAIM with 50ms/s time quota and regions prioritization on
> > v5.15-rc5 Linux kernel with ZRAM swap device achieves 38.58% memory saving
> > with only 1.94% runtime overhead.  For this, DAMON_RECLAIM consumes only
> > 4.97% of single CPU time.
> 
> While it really consumes little CPU time, is it fine for `kdamond.0` to be in a 
> D (uninterruptible sleep) state all the time while active, pushing loadavg 
> over 1.0?

Good point, this could confuse some users using loadavg.  I will send a fix for
this soon.


Thanks,
SJ

> 
> Thanks.
> 
> -- 
> Oleksandr Natalenko (post-factum)
>