Messages in this thread | | | Date | Sun, 12 Apr 2015 21:31:20 +0200 | From | Boris Brezillon <> | Subject | Re: [PATCH] mtd: Add simple read disturb test |
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Hi Richard,
On Thu, 02 Apr 2015 18:18:34 +0200 Richard Weinberger <richard@nod.at> wrote:
> 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.
I'd vote for that solution too. I've looked at in-kernel mtd tests, and I'm pretty sure they can all be done in userland. This would prevent any kernel crash caused by buggy test modules.
> Where shall we move these tests into? mtd-utils?
I guess so, but I'll let Brian answer that one. How about dispatching them in mtd-utils' tests/ directory (some of them are NAND related tests, so creating a tests/nand would make sense, and others are more generic).
Best Regards,
Boris
-- Boris Brezillon, Free Electrons Embedded Linux and Kernel engineering http://free-electrons.com
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