From: Christoph Hellwig <hch@infradead.org>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: NeilBrown <neilb@suse.com>, Al Viro <viro@zeniv.linux.org.uk>,
linux-fsdevel <linux-fsdevel@vger.kernel.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 2/3] Improve fairness when locking the per-superblock s_anon list
Date: Fri, 10 Nov 2017 00:50:35 -0800 [thread overview]
Message-ID: <20171110085035.GA2304@infradead.org> (raw)
In-Reply-To: <CA+55aFwxFCi5mDEadCf8xxK-LQ-aXUhd1Ox6m51vsXt3uexFpw@mail.gmail.com>
On Thu, Nov 09, 2017 at 11:52:48AM -0800, Linus Torvalds wrote:
> Yes, getting rid of s_anon might involve crazy things like "let's just
> walk all the dentries at umount time", but honestly, that sounds
> preferable. Especially if we can just then do something like
>
> - set a special flag in the superblock if we ever use __d_obtain_alias()
>
> - only scan all the dentries on umount if that flag is set.
>
> Hmm?
The scan would be extremely painful with our current global dcache.
But then again the global dcache isn't exactly a good idea to start
with. If we had a per-sb dcache using e.g. the resizable hash table
the networking people seem to be fond off your idea would work really
well.
prev parent reply other threads:[~2017-11-10 8:50 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-11-09 3:22 [PATCH 0/3] Three VFS patch resends NeilBrown
2017-11-09 3:22 ` [PATCH 1/3] VFS: use synchronize_rcu_expedited() in namespace_unlock() NeilBrown
2017-11-09 3:22 ` [PATCH 3/3] VFS: close race between getcwd() and d_move() NeilBrown
2017-11-09 11:41 ` Nikolay Borisov
2017-11-09 13:08 ` Matthew Wilcox
2017-11-09 16:02 ` Nikolay Borisov
2017-11-09 20:23 ` Linus Torvalds
2017-11-09 22:14 ` NeilBrown
2017-11-10 1:40 ` Linus Torvalds
2017-11-10 4:45 ` NeilBrown
2017-11-10 19:52 ` Linus Torvalds
2017-11-10 20:53 ` Al Viro
2017-11-21 23:50 ` Al Viro
2017-11-22 1:31 ` NeilBrown
2017-11-09 3:22 ` [PATCH 2/3] Improve fairness when locking the per-superblock s_anon list NeilBrown
2017-11-09 19:52 ` Linus Torvalds
2017-11-09 20:50 ` Al Viro
2017-11-09 23:09 ` NeilBrown
2017-11-09 23:19 ` Al Viro
2017-11-10 0:02 ` Linus Torvalds
2017-11-10 8:50 ` Christoph Hellwig [this message]
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