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SubjectRe: negative dentries wasting ram
Date

> as far I can see that negative dentries are not caching anything, they
> should be dropped immediatly, they even slowdown the lookups because
> they're hashed.

They cache things like this:
open("/usr/lib/locale/de_DE+euro/LC_MEASUREMENT", O_RDONLY) = -1 ENOENT (No
such file or directory)
open("/usr/lib/locale/de_DE@euro/LC_MEASUREMENT", O_RDONLY) = 3

Thus they are not really useless, they are just not usefully limited.
Thus IMHO you should look at the swap out path.

Regards
Oliver

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