linux-kernel - Re: [PATCH] mm: Drop "PFNs busy" printk in an expected path.

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Date:   Sat, 31 Dec 2016 06:08:45 +0100
From:   Michal Nazarewicz <mina86@...a86.com>
To:     Eric Anholt <eric@...olt.net>, Michal Hocko <mhocko@...nel.org>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        linux-stable <stable@...r.kernel.org>,
        "Robin H. Johnson" <robbat2@...is-terrarum.net>,
        Vlastimil Babka <vbabka@...e.cz>,
        Marek Szyprowski <m.szyprowski@...sung.com>
Subject: Re: [PATCH] mm: Drop "PFNs busy" printk in an expected path.

On Fri, Dec 30 2016, Eric Anholt wrote:
> OK, so the design is bad.  When you said bug, I definitely thought you
> were saying that the message shouldn't happen in the design.
>
> Given CMA's current design, should everyone using CMA see their logs
> slowly growing with this message that is an secret code for "CMA's
> design hasn't yet changed"?

Just to be clear, it’s not CMA’s design; it’s movable page’s design that
is bad (at least in the context of this discussion).

But yes, because of the way movable pages are, everyone is likely to see
the message.

> If you want to have people be able to track how often this is
> happening, let's make a perf event for it or something instead.

Sure.

-- 
Best regards
ミハウ “𝓶𝓲𝓷𝓪86” ナザレヴイツ
«If at first you don’t succeed, give up skydiving»