On 06/06/2011 05:43 PM, Eric Paris wrote:
Well, you are both correct. If you add a mark with only 'ignored'
events set it will not pin the inode into the kernel. If the system
starts to get under memory pressure the kernel will kick unused inodes
and any associated ignored marks out of ram. Inodes with 'real' events
attached will be pinned in memory and cannot be evicted under memory
pressure.
So if we use marks with only 'ignored' events then under memory pressure
mm subsystem will shrink inode cache that will free our marks and
therefore it's safe to use FAN_UNLIMITED_MARKS in this case?
If it really works then we don't need LRU cache in fanotify because it's
already implemented in dentry_cache/inode_cache.
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