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Old 08-07-2007, 09:50 AM   #1
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Distribution: Ubuntu 7.04
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Breakdown of cache objects

My boss has asked me to give him something that will show the breakdown of cache usage on a Linux server (Red Hat Enterprise Linux 5).

I can get various information from /proc/slabinfo but I was wondering:

1) Does slabinfo contain information about all Linux memory usage, or just cache (I've found various sources that seem ambiguous on this point).

2) Is there a way to perform a more detailed breakdown of the inode and dentry caches, specifically to list the inodes (or file fragments) being cached?

3) What's the difference between ext3_inode_cache and inode_cache? (I would have thought that the VFS would cause everything to go into inode_cache).

4) Is there a definitive list somewhere of what all the various slab entry names really mean? I would like to give summaries by cache type (network, filesystem, etc.) but I have no idea what half of the cache names are.

Any help would be much appreciated.

Robert Lee.
Old 08-15-2007, 03:19 AM   #2
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About 2): My boss won't free up the time to write a kernel module to do this, but the API it would need to use is at



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