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xfs_inode slab

To: xfs@xxxxxxxxxxx
Subject: xfs_inode slab
From: "Nikolay S." <nowhere@xxxxxxxxxxxxxxxx>
Date: Sun, 10 Feb 2013 11:14:09 +0400
Delivered-to: xfs@xxxxxxxxxxx
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

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


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