From: Al Viro <viro@ZenIV.linux.org.uk>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Josef Bacik <jbacik@fb.com>, stable <stable@vger.kernel.org>,
Andi Kleen <andi@firstfloor.org>,
linux-fsdevel <linux-fsdevel@vger.kernel.org>,
Christoph Hellwig <hch@infradead.org>, Chris Mason <clm@fb.com>
Subject: Re: Name hashing function causing a perf regression
Date: Mon, 15 Sep 2014 17:25:16 +0100 [thread overview]
Message-ID: <20140915162516.GU7996@ZenIV.linux.org.uk> (raw)
In-Reply-To: <CA+55aFyFYzXdPCR3nyjJBTYbEbTb1isrGJX1kDHe4EKjXTu2sA@mail.gmail.com>
On Mon, Sep 15, 2014 at 09:22:57AM -0700, Linus Torvalds wrote:
> The other performance issues I found are actually potentially worse,
> but they aren't regressions and they hit only when using namespaces.
> Which mostly nobody does on old kernels anyway. More of a "systemd
> uses namespaces for /tmp, and then it's quite noticeable as slowing
> down pathname lookups there if you benchmark it".
Umm... They are easy to trigger with just mount --bind; no namespaces
needed, actually.
next prev parent reply other threads:[~2014-09-15 16:25 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-09-09 19:30 Name hashing function causing a perf regression Josef Bacik
2014-09-12 19:11 ` Andi Kleen
2014-09-12 19:21 ` Linus Torvalds
2014-09-12 19:52 ` Josef Bacik
2014-09-12 20:39 ` Linus Torvalds
2014-09-12 21:25 ` Josef Bacik
2014-09-12 22:01 ` Linus Torvalds
2014-09-12 22:08 ` Josef Bacik
2014-09-12 22:25 ` Linus Torvalds
2014-09-13 18:58 ` Linus Torvalds
2014-09-15 1:32 ` Linus Torvalds
2014-09-15 2:49 ` Tetsuo Handa
2014-09-15 3:37 ` Linus Torvalds
2014-09-15 4:58 ` Tetsuo Handa
2014-09-15 14:17 ` Linus Torvalds
2014-09-15 15:55 ` Josef Bacik
2014-09-15 16:22 ` Linus Torvalds
2014-09-15 16:25 ` Al Viro [this message]
2014-09-15 16:33 ` Linus Torvalds
2014-09-15 16:35 ` Greg KH
2014-09-15 16:45 ` Linus Torvalds
2014-09-15 16:53 ` Jiri Slaby
2014-09-15 17:31 ` Greg KH
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