From: Eric Dumazet <dada1@cosmosbay.com>
To: Dave Hansen <hansendc@us.ibm.com>
Cc: linux-kernel@vger.kernel.org, akpm@osdl.org, hch@infradead.org
Subject: Re: [PATCH 02/22] r/o bind mounts: add vfsmount writer counts
Date: Sat, 10 Feb 2007 00:41:16 +0100 [thread overview]
Message-ID: <45CD069C.20606@cosmosbay.com> (raw)
In-Reply-To: <20070209225330.42133693@localhost.localdomain>
Dave Hansen a écrit :
> @@ -56,6 +57,7 @@ struct vfsmount {
> struct vfsmount *mnt_master; /* slave is on master->mnt_slave_list */
> struct mnt_namespace *mnt_ns; /* containing namespace */
> struct user_namespace *mnt_user_ns; /* namespace for uid interpretation */
> + int mnt_writers; /* nr files open for write */
> /*
> * We put mnt_count & mnt_expiry_mark at the end of struct vfsmount
> * to let these frequently modified fields in a separate cache line
> @@ -72,7 +74,26 @@ static inline struct vfsmount *mntget(st
> atomic_inc(&mnt->mnt_count);
> return mnt;
Dave, please read again this comment in struct vfsmount definition.
If I understand your infrastructure, mnt_writers is going to be frequently
modified, so it should be placed at the end of struct vfsmount, in the same
cache line than mnt_count.
Thank you
Eric
next prev parent reply other threads:[~2007-02-10 0:02 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-02-09 22:53 [PATCH 01/22] filesystem helpers for custom 'struct file's Dave Hansen
2007-02-09 22:53 ` [PATCH 02/22] r/o bind mounts: add vfsmount writer counts Dave Hansen
2007-02-09 23:41 ` Eric Dumazet [this message]
2007-02-10 0:10 ` Dave Hansen
2007-02-09 22:53 ` [PATCH 03/22] record when sb_writer_count elevated for inode Dave Hansen
2007-02-09 22:53 ` [PATCH 04/22] elevate writer count for chown and friends Dave Hansen
2007-02-09 22:53 ` [PATCH 05/22] elevate mnt writers for callers of vfs_mkdir() Dave Hansen
2007-02-09 22:53 ` [PATCH 06/22] elevate write count during entire ncp_ioctl() Dave Hansen
2007-02-09 22:53 ` [PATCH 08/22] elevate mount count for extended attributes Dave Hansen
2007-02-09 22:53 ` [PATCH 07/22] elevate write count for link and symlink calls Dave Hansen
2007-02-09 22:53 ` [PATCH 09/22] mount_is_safe(): add comment Dave Hansen
2007-02-09 22:53 ` [PATCH 10/22] unix_find_other() elevate write count for touch_atime() Dave Hansen
2007-02-09 22:53 ` [PATCH 11/22] elevate write count over calls to vfs_rename() Dave Hansen
2007-02-09 22:53 ` [PATCH 12/22] elevate write count files are open()ed Dave Hansen
2007-02-13 5:11 ` Andrew Morton
2007-02-13 16:58 ` Dave Hansen
2007-02-13 17:58 ` Andrew Morton
2007-02-14 0:17 ` Dave Hansen
2007-02-09 22:53 ` [PATCH 13/22] elevate writer count for do_sys_truncate() Dave Hansen
2007-02-09 22:53 ` [PATCH 14/22] elevate write count for do_utimes() Dave Hansen
2007-02-09 22:53 ` [PATCH 15/22] elevate write count for do_sys_utime() and touch_atime() Dave Hansen
2007-02-09 22:53 ` [PATCH 16/22] sys_mknodat(): elevate write count for vfs_mknod/create() Dave Hansen
2007-02-09 22:53 ` [PATCH 17/22] elevate mnt writers for vfs_unlink() callers Dave Hansen
2007-02-09 22:53 ` [PATCH 18/22] do_rmdir(): elevate write count Dave Hansen
2007-02-09 22:53 ` [PATCH 20/22] [PATCH] gfs: check nlink count Dave Hansen
2007-02-09 22:53 ` [PATCH 19/22] elevate writer count for custom struct_file Dave Hansen
2007-02-09 22:53 ` [PATCH 21/22] honor r/w changes at do_remount() time Dave Hansen
2007-02-09 23:22 ` Andrew Morton
2007-02-10 0:00 ` Dave Hansen
2007-02-10 0:29 ` Anton Altaparmakov
2007-02-10 9:54 ` Jan Engelhardt
2007-02-09 22:53 ` [PATCH 22/22] kill open files traverse on remount ro Dave Hansen
2007-02-09 23:18 ` [PATCH 01/22] filesystem helpers for custom 'struct file's Andrew Morton
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