From: Al Viro <viro@zeniv.linux.org.uk>
To: Andreas Gruenbacher <agruenba@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
cluster-devel <cluster-devel@redhat.com>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Jan Kara <jack@suse.cz>, Matthew Wilcox <willy@infradead.org>
Subject: Re: [RFC 4/9] gfs2: Fix mmap + page fault deadlocks (part 1)
Date: Sat, 12 Jun 2021 21:35:13 +0000 [thread overview]
Message-ID: <YMUokdiLMIpr8ee/@zeniv-ca.linux.org.uk> (raw)
In-Reply-To: <YMUhpI/ZIuxvKCt8@zeniv-ca.linux.org.uk>
On Sat, Jun 12, 2021 at 09:05:40PM +0000, Al Viro wrote:
> Is the above an accurate description of the mainline situation there?
> In particular, normal read doesn't seem to bother with locks at all.
> What exactly are those cluster locks for in O_DIRECT read?
BTW, assuming the lack of contention, how costly is dropping/regaining
such cluster lock?
next prev parent reply other threads:[~2021-06-12 21:35 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-31 17:01 [RFC 0/9] gfs2: handle page faults during read and write Andreas Gruenbacher
2021-05-31 17:01 ` [RFC 1/9] gfs2: Clean up the error handling in gfs2_page_mkwrite Andreas Gruenbacher
2021-05-31 17:01 ` [RFC 2/9] gfs2: Add wrapper for iomap_file_buffered_write Andreas Gruenbacher
2021-05-31 17:01 ` [RFC 3/9] gfs2: Add gfs2_holder_is_compatible helper Andreas Gruenbacher
2021-05-31 17:01 ` [RFC 4/9] gfs2: Fix mmap + page fault deadlocks (part 1) Andreas Gruenbacher
2021-06-01 6:00 ` Linus Torvalds
2021-06-02 11:16 ` Andreas Gruenbacher
2021-06-11 16:25 ` Al Viro
2021-06-12 21:05 ` Al Viro
2021-06-12 21:35 ` Al Viro [this message]
2021-06-13 8:44 ` [Cluster-devel] " Steven Whitehouse
2021-05-31 17:01 ` [RFC 5/9] iov_iter: Add iov_iter_fault_in_writeable() Andreas Gruenbacher
2021-05-31 17:12 ` Al Viro
2021-06-12 21:12 ` Al Viro
2021-06-12 21:33 ` Linus Torvalds
2021-06-12 21:47 ` Al Viro
2021-06-12 23:17 ` Linus Torvalds
2021-06-12 23:38 ` Al Viro
2021-05-31 17:01 ` [RFC 6/9] gfs2: Add wrappers for accessing journal_info Andreas Gruenbacher
2021-05-31 17:01 ` [RFC 7/9] gfs2: Encode glock holding and retry flags in journal_info Andreas Gruenbacher
2021-05-31 17:01 ` [RFC 8/9] gfs2: Add LM_FLAG_OUTER glock holder flag Andreas Gruenbacher
2021-05-31 17:01 ` [RFC 9/9] gfs2: Fix mmap + page fault deadlocks (part 2) Andreas Gruenbacher
2021-06-01 5:47 ` Linus Torvalds
[not found] ` <CAHk-=wgX=fZ+y=SxBsod8CvZmZ0-X7vZ6dV6EgLPkpBXbt=nQQ@mail.gmail.com>
2021-05-31 20:35 ` [RFC 0/9] gfs2: handle page faults during read and write Andreas Gruenbacher
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