Re: 2.6.17-rc5-mm1

[Andy Whitcroft <apw@shadowen.org>]

Christoph Lameter wrote:
> On Mon, 5 Jun 2006, Andy Whitcroft wrote:
> 
> 
>>Ok.  Did a split search on -mm2 for this.  With the full stack I was
>>still tripping up on the bad thread hand-off trigger above.  However,
>>when split searching I seemed to get somewhat different panics pretty
>>commonly in the allocator.  My split search led me to the start of the
>>swapless page migration patches:
>>
>>GOOD:page-migration-cleanup-pass-mapping-to-migration-functions.patch
>>GOOD:page-migration-cleanup-move-fallback-handling-into-special-function.patch
>>----:swapless-pm-add-r-w-migration-entries.patch
>>-BAD:swapless-pm-add-r-w-migration-entries-fix-2.patch
> 
> 
> 
> So it happens with r-w-migration-entries but not without fix-2? Or does 
> it require the fix-2 in order to happen? Without the fix page migration 
> is broken.
> 

I took the swapless-pm-add-r-w-migration-entries.patch and -fix-2.patch
as a single patch and didn't test the ----'d level.  It worked anywhere
I tested up to and including the last one marked GOOD above.  Anywhere
below that was a mess.  Backing out those two patches (and a bunch of
dependant ones) seemed to make the problems we get very different, and
if Martin is right the same as problems we are seeing on other
architectures.  So I am leaning to the feeling that this part of -mm is
introducing a problem.

> Does LTP include any page migration tests? Guess not? If not then this 
> could be simply due to code rearrangement making the problem appear in a 
> different way.
> 
> Which test did this?
> 
> Swap migration uses the two higest numbers of swap types (30 and 31). If 
> those are generated by something then we could have trouble but I do not 
> see how the patches could hurt otherwise.

I uses an awful lot of very wierd swap things.    So possibly there is a
tie in there?

-apw

Adding 65528k swap on ./swapfile01.  Priority:-2 extents:116 across:360044k
Adding 65528k swap on ./swapfile01.  Priority:-3 extents:104 across:569492k
Adding 65528k swap on ./swapfile01.  Priority:-4 extents:172 across:520952k
Unable to find swap-space signature
Adding 32k swap on swapfile02.  Priority:-5 extents:2 across:60k
Adding 32k swap on swapfile03.  Priority:-6 extents:1 across:32k
Adding 32k swap on swapfile04.  Priority:-7 extents:1 across:32k
Adding 32k swap on swapfile05.  Priority:-8 extents:3 across:44k
Adding 32k swap on swapfile06.  Priority:-9 extents:1 across:32k
Adding 32k swap on swapfile07.  Priority:-10 extents:1 across:32k
Adding 32k swap on swapfile08.  Priority:-11 extents:1 across:32k
Adding 32k swap on swapfile09.  Priority:-12 extents:1 across:32k
Adding 32k swap on swapfile10.  Priority:-13 extents:1 across:32k
Adding 32k swap on swapfile11.  Priority:-14 extents:1 across:32k
Adding 32k swap on swapfile12.  Priority:-15 extents:1 across:32k
Adding 32k swap on swapfile13.  Priority:-16 extents:1 across:32k
Adding 32k swap on swapfile14.  Priority:-17 extents:1 across:32k
Adding 32k swap on swapfile15.  Priority:-18 extents:1 across:32k
Adding 32k swap on swapfile16.  Priority:-19 extents:1 across:32k
Adding 32k swap on swapfile17.  Priority:-20 extents:1 across:32k
Adding 32k swap on swapfile18.  Priority:-21 extents:1 across:32k
Adding 32k swap on swapfile19.  Priority:-22 extents:1 across:32k
Adding 32k swap on swapfile20.  Priority:-23 extents:1 across:32k
Adding 32k swap on swapfile21.  Priority:-24 extents:1 across:32k
Adding 32k swap on swapfile22.  Priority:-25 extents:1 across:32k
Adding 32k swap on swapfile23.  Priority:-26 extents:1 across:32k
Adding 32k swap on swapfile24.  Priority:-27 extents:1 across:32k
Adding 32k swap on swapfile25.  Priority:-28 extents:1 across:32k
Adding 32k swap on swapfile26.  Priority:-29 extents:1 across:32k
Adding 32k swap on swapfile27.  Priority:-30 extents:1 across:32k
Adding 32k swap on swapfile28.  Priority:-31 extents:1 across:32k
Adding 32k swap on swapfile29.  Priority:-32 extents:1 across:32k
Adding 32k swap on swapfile30.  Priority:-33 extents:1 across:32k
Adding 32k swap on swapfile31.  Priority:-34 extents:1 across:32k
Adding 32k swap on swapfile32.  Priority:-35 extents:1 across:32k
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