Re: [bcachefs] mount: page allocation failure: order:7, mode:0x24000c0(GFP_KERNEL) / BUG: unable to handle kernel NULL pointer dereference at 0000000000000008

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W dniu 26.08.2016 o 04:14, Kent Overstreet pisze:
> On Thu, Aug 25, 2016 at 07:16:41PM +0200, Marcin wrote:
>> Hi again,
>> I created tiered filesystem (tier 1 device has 1.4TB, tier 0 device has
>> 10GB) but mounting failed (host has 1GB of RAM):
> 
> enable CONFIG_COMPACTION - I'm going to change bcache's kconfig to enable that
> if bcache is enabled, this comes up too much.
> 
> though, I believe that's the mempool for compression workspaces, can probably
> switch that to vmalloc.

I saw thread "OOM regression in 4.7". I was thinking if it can be case
here but I have got COMPACTION turned on. And this situation occured
when most of ram was used by filesystem cache (but it wasn't dirty data).




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