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To: Linus Torvalds <torvalds@linux-foundation.org>
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Subject: Re: performance delta after VFS i_mutex=>i_rwsem conversion
From: Valdis.Kletnieks@vt.edu
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Date: Mon, 06 Jun 2016 23:22:52 -0400
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On Mon, 06 Jun 2016 14:20:32 -0700, Linus Torvalds said:

> I guess some "concurrent readdir with unlink" load would show that
> behavior, but is it _realistic_? No idea. Let's not worry about it too
> much until somebody shows a reason to worry.

I've seen Makefiles where 'make clean' does a 'find . -name "*.o" | xargs rm'.

But if somebody is doing that often enough against cache-cold directory trees
to matter, they have bigger problems (like learning how to properly develop
code using 'make').  So unless performance is *so* bad it triggers the lockup
detector, it's probably OK....


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