Re: [viro-vfs:work.dcache2] [__dentry_kill()] 1b738f196e: stress-ng.sysinfo.ops_per_sec -27.2% regression

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On Fri, Dec 01, 2023 at 10:13:09AM +0800, Oliver Sang wrote:

> > Very interesting...  Out of curiosity, what effect would the following
> > have on top of 1b738f196e?
> 
> I applied the patch upon 1b738f196e (as below fec356fd0c), but seems less
> useful.

I would be rather surprised if it fixed anything; it's just that 1b738f196e
changes two things - locking rules for __dentry_kill() and, in some cases,
the order of dentry eviction in shrink_dentry_list().  That delta on top of
it restores the original order in shrink_dentry_list(), leaving pretty much
the changes in lock_for_kill()/dput()/__dentry_kill().

Interesting...  Looks like there are serious changes in context switch
frequencies, but I don't see where could that have come from...




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