Re: 1352 NUL bytes at the end of a page? (was Re: Assertion `s &&s->tree' failed: The saga continues.)

From: Linus Torvalds
Date: Sat May 15 2004 - 23:54:08 EST

On Sat, 15 May 2004, Steven Cole wrote:
> OK, will do. I ran the bk exerciser script for over an hour with 2.6.6-current
> and no CONFIG_PREEMPT and no errors. The script only reported one
> iteration finished, while I got it to do 36 iterations over several hours earlier
> today (with a 2.6.3-4mdk vendor kernel)

Hmm.. Th ecurrent BK tree contains much of the anonvma stuff, so this
might actually be a serious VM performance regression. That could
effectively be hiding whatever problem you saw.

Andrea: have you tested under low memory and high fs load? Steven has 384M
or RAM, which _will_ cause a lot of VM activity when doing a full kernel
BK clone + undo + pull, which is what his test script ends up doing...

It would be good to test going back to the kernel that saw the "immediate
problem", and try that version without CONFIG_PREEMPT.

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