All of lore.kernel.org
 help / color / mirror / Atom feed
From: Joseph Qi <joseph.qi@linux.alibaba.com>
To: Gang He <ghe@suse.com>, mark@fasheh.com, jlbec@evilplan.org
Cc: linux-kernel@vger.kernel.org, ocfs2-devel@oss.oracle.com,
	akpm@linux-foundation.org
Subject: Re: [PATCH] ocfs2: avoid getting dlm lock of the target directory multiple times during reflink process
Date: Mon, 6 Sep 2021 19:14:26 +0800	[thread overview]
Message-ID: <41bc413d-0926-0eae-6772-076314bbae53@linux.alibaba.com> (raw)
In-Reply-To: <20210826075941.28480-1-ghe@suse.com>

Hi Gang,


On 8/26/21 3:59 PM, Gang He wrote:
> During the reflink process, we should acquire the target directory
> inode dlm lock at the beginning, and hold this dlm lock until end
> of the function.
> With this patch, we avoid dlm lock ping-pong effect when clone
> files to the same directory simultaneously from multiple nodes.
> There is a typical user scenario, users regularly back up files
> to a specified directory through the reflink feature from the
> multiple nodes.
> 
Since now it take dir inode lock across the whole reflink, it may impact
other concurrent operations under the same directory.
Have you evaluated such cases?

Thanks,
Joseph



WARNING: multiple messages have this Message-ID
From: Joseph Qi <joseph.qi@linux.alibaba.com>
To: Gang He <ghe@suse.com>, mark@fasheh.com, jlbec@evilplan.org
Cc: linux-kernel@vger.kernel.org, ocfs2-devel@oss.oracle.com
Subject: Re: [Ocfs2-devel] [PATCH] ocfs2: avoid getting dlm lock of the target directory multiple times during reflink process
Date: Mon, 6 Sep 2021 19:14:26 +0800	[thread overview]
Message-ID: <41bc413d-0926-0eae-6772-076314bbae53@linux.alibaba.com> (raw)
In-Reply-To: <20210826075941.28480-1-ghe@suse.com>

Hi Gang,


On 8/26/21 3:59 PM, Gang He wrote:
> During the reflink process, we should acquire the target directory
> inode dlm lock at the beginning, and hold this dlm lock until end
> of the function.
> With this patch, we avoid dlm lock ping-pong effect when clone
> files to the same directory simultaneously from multiple nodes.
> There is a typical user scenario, users regularly back up files
> to a specified directory through the reflink feature from the
> multiple nodes.
> 
Since now it take dir inode lock across the whole reflink, it may impact
other concurrent operations under the same directory.
Have you evaluated such cases?

Thanks,
Joseph



_______________________________________________
Ocfs2-devel mailing list
Ocfs2-devel@oss.oracle.com
https://oss.oracle.com/mailman/listinfo/ocfs2-devel

  parent reply	other threads:[~2021-09-06 11:14 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-26  7:59 [PATCH] ocfs2: avoid getting dlm lock of the target directory multiple times during reflink process Gang He
2021-08-26  7:59 ` [Ocfs2-devel] " Gang He
2021-08-31  6:25 ` Gang He
2021-08-31  6:25   ` [Ocfs2-devel] " Gang He
2021-08-31  7:39   ` Joseph Qi
2021-08-31  7:39     ` [Ocfs2-devel] " Joseph Qi
2021-09-07 15:57   ` Wengang Wang
2021-09-07 15:57     ` Wengang Wang
2021-09-08  6:06     ` Gang He
2021-09-08  6:06       ` Gang He
2021-09-08 16:00       ` Wengang Wang
2021-09-08 16:00         ` Wengang Wang
2021-09-14  7:34         ` Gang He
2021-09-14  7:34           ` Gang He
2021-09-14 17:50           ` Wengang Wang
2021-09-17  7:37             ` Gang He
2021-09-17  7:37               ` Gang He
2021-09-06 11:14 ` Joseph Qi [this message]
2021-09-06 11:14   ` Joseph Qi
2021-09-07  9:40   ` Gang He
2021-09-07  9:40     ` [Ocfs2-devel] " Gang He

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=41bc413d-0926-0eae-6772-076314bbae53@linux.alibaba.com \
    --to=joseph.qi@linux.alibaba.com \
    --cc=akpm@linux-foundation.org \
    --cc=ghe@suse.com \
    --cc=jlbec@evilplan.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=mark@fasheh.com \
    --cc=ocfs2-devel@oss.oracle.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.