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    SubjectRe: negative dentries wasting ram


    On Fri, 24 May 2002, Linus Torvalds wrote:

    >
    > On Fri, 24 May 2002, Alexander Viro wrote:
    > >
    > > On Fri, 24 May 2002, Linus Torvalds wrote:
    > >
    > > > However, you're right that it probably doesn't help to do this after
    > > > "unlink()" - it's probably only worth doing when actually doing a
    > > > "lookup()" that fails.
    > >
    > > Depends on many things, including the amount of userland code that does
    > > unlink(name);
    > > open(name, O_CREAT|O_EXCL..., ...);
    >
    > Note that this will have to touch the FS anyway, since the O_CREAT thing
    > forces a call down to the FS to actually create the file.

    > The only think we save is a dentry kfree/kmalloc in this case, nbot a FS
    > downcall. And I think Andrea is right that it can waste memory for the
    > likely much more common case where the file just stays removed.

    ???
    It's lookup + unlink + lookup + create vs. lookup + unlink + create.

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