linux-kernel - Re: Disabling in-memory write cache for x86-64 in Linux II

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Message-ID: <CA+55aFy7N9GPJ8K613Homyh_-6=vhMWYOBRs9U01y4Y2sqF+JQ@mail.gmail.com>
Date:	Tue, 29 Oct 2013 14:36:43 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Jan Kara <jack@...e.cz>, Karl Kiniger <karl.kiniger@....ge.com>,
	"Artem S. Tashkinov" <t.artem@...os.com>,
	Wu Fengguang <fengguang.wu@...el.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Disabling in-memory write cache for x86-64 in Linux II

On Tue, Oct 29, 2013 at 1:43 PM, Andrew Morton
<akpm@...ux-foundation.org> wrote:
> On Tue, 29 Oct 2013 21:30:50 +0100 Jan Kara <jack@...e.cz> wrote:
>
>> Andrew has queued up a patch series from Maxim Patlasov which removes this
>> caveat but currently we don't have a way admin can switch that from
>> userspace. But I'd like to have that tunable from userspace exactly for the
>> cases as you describe below.
>
> This?
>
>     mm/page-writeback.c: add strictlimit feature
>
> That's already in mainline, for 3.12.

Nothing currently actually *sets* the BDI_CAP_STRICTLIMIT flag, though.

So it's a potential fix, but it's certainly not a fix now.

               Linus
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