On Sun, Sep 14, 2014 at 7:49 PM, Tetsuo Handa <penguin-kernel@xxxxxxxxxxxxxxxxxxx> wrote: > > I care, at least as of RHEL6 (2.6.32) kernels. Some users are using tmpfs > in order to avoid dentry cache bouncing bomb (a series of simple stat() calls > take about 10 seconds when there are 300,000,000+ unused dentries, P31 of > http://I-love.SAKURA.ne.jp/tomoyo/LCJ2014-en.pdf ). I don't know performance > on recent kernels. Hmm. Probably not hugely different. It's still fairly easy to generate a lot of negative dentries. Do you have an actual test program that does this and is annoying? Do people actually do that? It shouldn't be impossible to keep negative dentries in check without getting rid of them *entirely*. They do speed up lots of common operations (things like $PATH lookups etc, negative caches really are useful). Linus -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
