linux-kernel - Re: [PATCH] mtd: Add simple read disturb test

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Date:	Thu, 02 Apr 2015 18:18:34 +0200
From:	Richard Weinberger <richard@....at>
To:	Brian Norris <computersforpeace@...il.com>
CC:	dwmw2@...radead.org, linux-mtd@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mtd: Add simple read disturb test

Am 02.04.2015 um 18:04 schrieb Brian Norris:
> On Thu, Apr 02, 2015 at 04:13:46PM +0200, Richard Weinberger wrote:
>> This simple MTD tests allows the user to see when read disturb happens.
>> By reading blocks over and over it reports flipped bits.
>> Currently it reports only flipped bits of the worst page of a block.
>> If within block X page P1 has 3 bit flips and P6 4, it will report 4.
>> By default every 50th block is read.
> 
> Didn't read through this much yet, but why do we need another in-kernel
> test that coul (AFAICT) be easily replicated in userspace? The same goes
> for several of the other tests, I think, actually. But at least with
> those, we have a history of keeping them around, so it's not too much
> burden [1].

I've added the test to drivers/mtd/tests/ because it fits into.
As simple as that.

> Brian
> 
> [1] Although there are some latent issues in these tests that are still
> getting get worked out (e.g., bad handling of 64-bit casting; too large
> of stacks; uninterruptibility). The latter two would not even exist if
> we were in user space.

uninterruptibility got solved by my "[PATCH] mtd: Make MTD tests cancelable" patch.

But if we want to kill drivers/mtd/tests/ I'll happily help out.
Where shall we move these tests into? mtd-utils?

Thanks,
//richard
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