Reboot while booting with new per-CPU allocator
Robert Watson
rwatson at FreeBSD.org
Fri Jun 17 10:07:36 GMT 2005
On Thu, 16 Jun 2005, Robert Watson wrote:
>> Great :) It did the trick. The laptop is happily booting with the new
>> allocator now. Thanks a lot to you and Alan Cox.
>
> Looks like what basically happened is this these kern_malloc.c changes
> increase the memory burden on UMA as statistics structures for malloc
> types now get allocated from UMA. It looks like, from your dmesg, you
> have a fair number of modules loaded, so the storage for the statistics
> comes out of the early UMA page pool, whereas before it came out of BSS.
> We'll see if further tuning is required or not with large numbers of
> modules. The thing that surprised me, though, is the unclean failure
> mode. The other report saw a clean panic which presumably made
> debugging it much easier...
Interestingly, there's been a bunch of reports of this in the past few
days, and there weren't immediately after the malloc commit. I wonder if
some other recent change has increased the amount of UMA memory allocated
early in the boot, increasing the level of reports...
Robert N M Watson
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