From: Christoph Hellwig <hch@infradead.org>
To: Andi Kleen <andi@firstfloor.org>
Cc: Dave Chinner <david@fromorbit.com>,
linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 15/18] fs: introduce a per-cpu last_ino allocator
Date: Fri, 8 Oct 2010 04:44:41 -0400 [thread overview]
Message-ID: <20101008084441.GA17366@infradead.org> (raw)
In-Reply-To: <87d3rl5c1h.fsf@basil.nowhere.org>
On Fri, Oct 08, 2010 at 10:22:34AM +0200, Andi Kleen wrote:
> Dave Chinner <david@fromorbit.com> writes:
>
> > From: Eric Dumazet <eric.dumazet@gmail.com>
> >
> > new_inode() dirties a contended cache line to get increasing
> > inode numbers. This limits performance on workloads that cause
> > significant parallel inode allocation.
> >
> > Solve this problem by using a per_cpu variable fed by the shared
> > last_ino in batches of 1024 allocations. This reduces contention on
> > the shared last_ino, and give same spreading ino numbers than before
> > (i.e. same wraparound after 2^32 allocations).
>
> This doesn't help for Unix disk file systems, so not fully sure why you
> need it for XFS.
Currently i_ino is assigned for every inode allocated using new_inode.
It's pretty stupid as most callers simply don't need it. But Dave
didn't want to make this series even more complicated than nessecary
and leave sorting this out for later.
next prev parent reply other threads:[~2010-10-08 8:44 UTC|newest]
Thread overview: 162+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-10-08 5:21 fs: Inode cache scalability V2 Dave Chinner
2010-10-08 5:21 ` [PATCH 01/18] kernel: add bl_list Dave Chinner
2010-10-08 8:18 ` Andi Kleen
2010-10-08 10:33 ` Dave Chinner
2010-10-08 5:21 ` [PATCH 02/18] fs: Convert nr_inodes and nr_unused to per-cpu counters Dave Chinner
2010-10-08 7:01 ` Christoph Hellwig
2010-10-08 5:21 ` [PATCH 03/18] fs: keep inode with backing-dev Dave Chinner
2010-10-08 7:01 ` Christoph Hellwig
2010-10-08 7:27 ` Dave Chinner
2010-10-08 5:21 ` [PATCH 04/18] fs: Implement lazy LRU updates for inodes Dave Chinner
2010-10-08 7:08 ` Christoph Hellwig
2010-10-08 7:31 ` Dave Chinner
2010-10-08 9:08 ` Al Viro
2010-10-08 9:51 ` Dave Chinner
2010-10-08 5:21 ` [PATCH 05/18] fs: inode split IO and LRU lists Dave Chinner
2010-10-08 7:14 ` Christoph Hellwig
2010-10-08 7:38 ` Dave Chinner
2010-10-08 9:16 ` Al Viro
2010-10-08 9:58 ` Dave Chinner
2010-10-08 5:21 ` [PATCH 06/18] fs: Clean up inode reference counting Dave Chinner
2010-10-08 7:20 ` Christoph Hellwig
2010-10-08 7:46 ` Dave Chinner
2010-10-08 8:15 ` Christoph Hellwig
2010-10-08 5:21 ` [PATCH 07/18] exofs: use iput() for inode reference count decrements Dave Chinner
2010-10-08 7:21 ` Christoph Hellwig
2010-10-16 7:56 ` Nick Piggin
2010-10-16 16:29 ` Christoph Hellwig
2010-10-17 15:41 ` Boaz Harrosh
2010-10-08 5:21 ` [PATCH 08/18] fs: add inode reference coutn read accessor Dave Chinner
2010-10-08 7:24 ` Christoph Hellwig
2010-10-08 5:21 ` [PATCH 09/18] fs: rework icount to be a locked variable Dave Chinner
2010-10-08 7:27 ` Christoph Hellwig
2010-10-08 7:50 ` Dave Chinner
2010-10-08 8:17 ` Christoph Hellwig
2010-10-08 13:16 ` Chris Mason
2010-10-08 9:32 ` Al Viro
2010-10-08 10:15 ` Dave Chinner
2010-10-08 13:14 ` Chris Mason
2010-10-08 13:53 ` Christoph Hellwig
2010-10-08 14:09 ` Dave Chinner
2010-10-08 5:21 ` [PATCH 10/18] fs: Factor inode hash operations into functions Dave Chinner
2010-10-08 7:29 ` Christoph Hellwig
2010-10-08 9:41 ` Al Viro
2010-10-08 5:21 ` [PATCH 11/18] fs: Introduce per-bucket inode hash locks Dave Chinner
2010-10-08 7:33 ` Christoph Hellwig
2010-10-08 7:51 ` Dave Chinner
2010-10-08 9:49 ` Al Viro
2010-10-08 9:51 ` Christoph Hellwig
2010-10-08 13:43 ` Christoph Hellwig
2010-10-08 14:17 ` Dave Chinner
2010-10-08 18:54 ` Christoph Hellwig
2010-10-16 7:57 ` Nick Piggin
2010-10-16 16:16 ` Christoph Hellwig
2010-10-16 17:12 ` Nick Piggin
2010-10-17 0:45 ` Christoph Hellwig
2010-10-17 2:06 ` Nick Piggin
2010-10-17 0:46 ` Dave Chinner
2010-10-17 2:25 ` Nick Piggin
2010-10-18 16:16 ` Andi Kleen
2010-10-18 16:21 ` Christoph Hellwig
2010-10-19 7:00 ` Nick Piggin
2010-10-19 16:50 ` Christoph Hellwig
2010-10-20 3:11 ` Nick Piggin
2010-10-24 15:44 ` Thomas Gleixner
2010-10-24 21:17 ` Nick Piggin
2010-10-25 4:41 ` Thomas Gleixner
2010-10-25 7:04 ` Thomas Gleixner
2010-10-26 0:12 ` Nick Piggin
2010-10-26 0:06 ` Nick Piggin
2010-10-08 5:21 ` [PATCH 12/18] fs: add a per-superblock lock for the inode list Dave Chinner
2010-10-08 7:35 ` Christoph Hellwig
2010-10-08 5:21 ` [PATCH 13/18] fs: split locking of inode writeback and LRU lists Dave Chinner
2010-10-08 7:42 ` Christoph Hellwig
2010-10-08 8:00 ` Dave Chinner
2010-10-08 8:18 ` Christoph Hellwig
2010-10-16 7:57 ` Nick Piggin
2010-10-16 16:20 ` Christoph Hellwig
2010-10-16 17:19 ` Nick Piggin
2010-10-17 1:00 ` Dave Chinner
2010-10-17 2:20 ` Nick Piggin
2010-10-08 5:21 ` [PATCH 14/18] fs: Protect inode->i_state with th einode->i_lock Dave Chinner
2010-10-08 7:49 ` Christoph Hellwig
2010-10-08 8:04 ` Dave Chinner
2010-10-08 8:18 ` Christoph Hellwig
2010-10-16 7:57 ` Nick Piggin
2010-10-16 16:19 ` Christoph Hellwig
2010-10-09 8:05 ` Christoph Hellwig
2010-10-09 14:52 ` Matthew Wilcox
2010-10-10 2:01 ` Dave Chinner
2010-10-08 5:21 ` [PATCH 15/18] fs: introduce a per-cpu last_ino allocator Dave Chinner
2010-10-08 7:53 ` Christoph Hellwig
2010-10-08 8:05 ` Dave Chinner
2010-10-08 8:22 ` Andi Kleen
2010-10-08 8:44 ` Christoph Hellwig [this message]
2010-10-08 9:58 ` Al Viro
2010-10-08 10:09 ` Andi Kleen
2010-10-08 10:19 ` Al Viro
2010-10-08 10:20 ` Eric Dumazet
2010-10-08 9:56 ` Al Viro
2010-10-08 10:03 ` Christoph Hellwig
2010-10-08 10:20 ` Eric Dumazet
2010-10-08 13:48 ` Christoph Hellwig
2010-10-08 14:06 ` Eric Dumazet
2010-10-08 19:10 ` Christoph Hellwig
2010-10-09 17:14 ` Matthew Wilcox
2010-10-16 7:57 ` Nick Piggin
2010-10-16 16:22 ` Christoph Hellwig
2010-10-16 17:21 ` Nick Piggin
2010-10-08 5:21 ` [PATCH 16/18] fs: Make iunique independent of inode_lock Dave Chinner
2010-10-08 7:55 ` Christoph Hellwig
2010-10-08 8:06 ` Dave Chinner
2010-10-08 8:19 ` Christoph Hellwig
2010-10-08 5:21 ` [PATCH 17/18] fs: icache remove inode_lock Dave Chinner
2010-10-08 8:03 ` Christoph Hellwig
2010-10-08 8:09 ` Dave Chinner
2010-10-13 7:20 ` Nick Piggin
2010-10-13 7:27 ` Nick Piggin
2010-10-13 11:28 ` Christoph Hellwig
2010-10-13 12:03 ` Nick Piggin
2010-10-13 12:20 ` Christoph Hellwig
2010-10-13 12:25 ` Nick Piggin
2010-10-13 10:42 ` Eric Dumazet
2010-10-13 12:07 ` Nick Piggin
2010-10-13 11:25 ` Christoph Hellwig
2010-10-13 12:30 ` Nick Piggin
2010-10-13 23:23 ` Dave Chinner
2010-10-14 9:06 ` Nick Piggin
2010-10-14 9:13 ` Nick Piggin
2010-10-14 14:41 ` Christoph Hellwig
2010-10-15 0:14 ` Nick Piggin
2010-10-15 3:13 ` Dave Chinner
2010-10-15 3:30 ` Nick Piggin
2010-10-15 3:44 ` Nick Piggin
2010-10-15 6:41 ` Nick Piggin
2010-10-15 10:59 ` Dave Chinner
2010-10-15 13:03 ` Nick Piggin
2010-10-15 13:29 ` Nick Piggin
2010-10-15 17:33 ` Nick Piggin
2010-10-15 17:52 ` Christoph Hellwig
2010-10-15 18:02 ` Nick Piggin
2010-10-15 18:14 ` Nick Piggin
2010-10-16 2:09 ` Nick Piggin
2010-10-15 14:11 ` Nick Piggin
2010-10-15 20:50 ` Nick Piggin
2010-10-15 20:56 ` Nick Piggin
2010-10-15 4:04 ` Nick Piggin
2010-10-15 11:33 ` Dave Chinner
2010-10-15 13:14 ` Nick Piggin
2010-10-15 15:38 ` Nick Piggin
2010-10-16 7:57 ` Nick Piggin
2010-10-08 5:21 ` [PATCH 18/18] fs: Reduce inode I_FREEING and factor inode disposal Dave Chinner
2010-10-08 8:11 ` Christoph Hellwig
2010-10-08 10:18 ` Al Viro
2010-10-08 10:52 ` Dave Chinner
2010-10-08 12:10 ` Al Viro
2010-10-08 13:55 ` Dave Chinner
2010-10-09 17:22 ` Matthew Wilcox
2010-10-09 8:08 ` [PATCH 19/18] fs: split __inode_add_to_list Christoph Hellwig
2010-10-12 10:47 ` Dave Chinner
2010-10-12 11:31 ` Christoph Hellwig
2010-10-12 12:05 ` Dave Chinner
2010-10-09 11:18 ` [PATCH 20/18] fs: do not assign default i_ino in new_inode Christoph Hellwig
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