Messages in this thread | | | From | Linus Torvalds <> | Date | Sat, 14 Jul 2018 11:00:32 -0700 | Subject | Re: [PATCH v5 0/6] fs/dcache: Track & limit # of negative dentries |
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On Sat, Jul 14, 2018 at 10:35 AM Pavel Machek <pavel@ucw.cz> wrote: > > Could we allocate -ve entries from separate slab?
No, because negative dentrires don't stay negative.
Every single positive dentry starts out as a negative dentry that is passed in to "lookup()" to maybe be made positive.
And most of the time they <i>do</i> turn positive, because most of the time people actually open files that exist.
But then occasionally you don't, because you're just blindly opening a filename whether it exists or not (to _check_ whether it's there).
Linus
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