Re: CONFIG_PREEMPT and JFFS2 oops

Orjan Friberg
2012-01-26T17:54:53Z

On 01/26/2012 05:57 PM, Paul Walmsley wrote:
>>
>> You just throw away best_buf here, don't you?
>
> You're right. It's even worse than that. best_buf will contain the data
> from the last compressor used. And it will be prematurely freed. Here's
> a fixed version.

I've tested this version for a while now with the same result as before.

No oopses, no spinlock violations. I copied a 2MB file from the SD/MMC
partition to the two JFFS2 partitions and md5summ'ed it a bunch of
times. After that I unmounted and remounted both partitions.

I do see a steady memory usage increase when doing continuous testing,
but whether that's normal I don't know. I see at least some of it being
reclaimed when unmounting the JFFS2 partitions (grep jffs2 /proc/slabinfo).

--
Orjan Friberg
FlatFrog Laboratories AB