linux-kernel - [RFC v2 0/1] fs/namespace: defer RCU sync for MNT

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Date: Fri, 26 Apr 2024 15:53:47 -0400
From: Lucas Karpinski <lkarpins@...hat.com>
To: viro@...iv.linux.org.uk,
	brauner@...nel.org,
	jack@...e.cz
Cc: linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	alexl@...hat.com,
	echanude@...hat.com,
	ikent@...hat.com,
	Lucas Karpinski <lkarpins@...hat.com>
Subject: [RFC v2 0/1] fs/namespace: defer RCU sync for MNT_DETACH umount

Hi all,                                            
                                                   
Attached is v2 of the umount optimization. Please take a look at v1 for
the original introduction to the problem. Al made it clear in the
previous RFC that if a filesystem is shut down by umount(2), that the
shut down needs to be completed before the return from the syscall.
                                                   
The change in this version looks to address that by only deferring the
release on lazy umounts.                           
                                                   
Lucas                                              
                                                   
v2:                                                
- Only defer releasing umount'ed filesystems for lazy umounts
v1: https://lore.kernel.org/all/20230119205521.497401-1-echanude@redhat.com/

Lucas Karpinski (1):
  fs/namespace: defer RCU sync for MNT_DETACH umount

 fs/namespace.c | 51 ++++++++++++++++++++++++++++++++++++++++++++------
 1 file changed, 45 insertions(+), 6 deletions(-)

-- 
2.44.0