From: ebiederm-aS9lmoZGLiVWk0Htik3J/w@public.gmane.org (Eric W. Biederman)
To: Ian Kent <raven-PKsaG3nR2I+sTnJN9+BGXg@public.gmane.org>
Cc: linux-fsdevel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
Linux Containers
<containers-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org>,
Andrei Vagin <avagin-GEFAQzZX7r8dnm+yROfE0A@public.gmane.org>,
Alexander Viro
<viro-RmSDqhL/yNMiFSDQTTA3OLVCufUGDwFn@public.gmane.org>
Subject: Re: [PATCH RFC] mnt: umount mounts one by one in umount_tree()
Date: Wed, 14 Jun 2017 04:37:19 -0500 [thread overview]
Message-ID: <87wp8ec3lc.fsf@xmission.com> (raw)
In-Reply-To: <1497405190.2595.3.camel-PKsaG3nR2I+sTnJN9+BGXg@public.gmane.org> (Ian Kent's message of "Wed, 14 Jun 2017 09:53:10 +0800")
Ian Kent <raven@themaw.net> writes:
> On Fri, 2017-05-12 at 00:08 -0700, Andrei Vagin wrote:
>> With this patch, we don't try to umount all mounts of a tree together.
>> Instead of this we umount them one by one. In this case, we see a significant
>> improvement in performance for the worsе case.
>
> Indeed, umount has been very slow for a while now.
> Even a moderately large number of mounts (~10000) become painfully slow.
>
> Re you still perusing this?
> Anything I can do to help?
>
> Eric, what are your thoughts on this latest attempt?
I have something slightly more recent. Please checkout my for-next
branch of my userns tree:
git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace.git for-next
There is one open area of semantics that I looking at with Ram Pai in
the hopes we can drive consensus before we take any patches for
better checkpoint-restart support.
Eric
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next prev parent reply other threads:[~2017-06-14 9:37 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20170512070838.5037-1-avagin@openvz.org>
[not found] ` <20170512070838.5037-1-avagin-GEFAQzZX7r8dnm+yROfE0A@public.gmane.org>
2017-05-12 18:56 ` [PATCH v2 RFC] mnt: umount mounts one by one in umount_tree() Andrei Vagin
2017-06-14 1:53 ` [PATCH " Ian Kent
[not found] ` <1497405190.2595.3.camel-PKsaG3nR2I+sTnJN9+BGXg@public.gmane.org>
2017-06-14 9:37 ` Eric W. Biederman [this message]
2017-05-12 7:08 Andrei Vagin
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