Re: [PATCH 08/19] ceph: address space operations

[Andi Kleen]

> There are two other memory allocations during writeout: a vector of pages 
> to be written, and the message we're sending to the OSD.  If I use a 
> mempool for those to guarantee as least some writeout will occur, how do I 
> safely defer when allocations do fail?  Will pdflush (or it's replacement) 
> eventually come back and try ->writepages() again?

mempool allocs should never fail, just block for a long time until
someone else frees. This means you need to ensure of course you
always make forward progress.

-Andi

-- 
ak@xxxxxxxxxxxxxxx -- Speaking for myself only.
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