xfs_inode slab

[Nikolay S.]

Hello there,

I see some bad behavior of xfs, which I can reproduce:

1. Create some directories and files on xfs volume (I use ~800000 files
and 80000 directories on 4GB RAM system)
2. Create workload, that produces light page cache pressure (say, 4-8
MB/s) and while pagecache eats all of free ram. I use the code from [1])
3. Stat all the objects on xfs volume

The result depends on kernel version:
	3.2) See kswapd struggling through D-state for several minutes.
	3.7) See kswapd struggling through D-state forever

Same steps on ext4 do not produce any bad results

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[1]	https://bugzilla.kernel.org/show_bug.cgi?id=53031

[2]