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From: Christoph Hellwig <hch@infradead.org>
To: npiggin@kernel.dk
Cc: linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org
Subject: Re: [patch 26/35] fs: icache alloc anonymous inode allocation
Date: Tue, 19 Oct 2010 12:33:27 -0400	[thread overview]
Message-ID: <20101019163327.GA5987@infradead.org> (raw)
In-Reply-To: <20101019034658.215515030@kernel.dk>

On Tue, Oct 19, 2010 at 02:42:42PM +1100, npiggin@kernel.dk wrote:
> Provide new_anon_inode function for inodes without a default inode number, and
> not on sb list. This can enable filesystems to reduce locking. "Real"
> filesystems can also reduce locking by allocating anonymous inode first, then
> adding it to lists after finding the inode number.

Having an _anon inode allocation for fileystsem that do manage the inode
lifetime is fine, but please don't mix that up with i_ino assignment,
as they are two totally different things.

Disk and network filesystem do not need a default i_ino, but they
absolutely do no need their inodes to be on the per-sb list.
anonfs/pipe/socket (and nothing else) can do away with the per-sb list,
but they do need a pseudo inode number.

I have a version of this port to Dave's tree which gets this right.
i_ino assignment is already moved out by my patch (which should apply
to your tree with minimal differences), so the new _anon only does not
put the inode on the list.  The other difference is that we don't bother
initializing i_sb_list in the main inode allocation path, but only in
new_anon_inode, and that the function is not exported - it really should
only be used for built-in filesystems that never get unmounted to be
safe.


  parent reply	other threads:[~2010-10-19 16:33 UTC|newest]

Thread overview: 70+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-10-19  3:42 [patch 00/35] my inode scaling series for review npiggin
2010-10-19  3:42 ` [patch 01/35] bit_spinlock: add required includes npiggin
2010-10-19  3:42 ` [patch 02/35] kernel: add bl_list npiggin
2010-10-19  3:42 ` [patch 03/35] mm: implement per-zone shrinker npiggin
2010-10-19  4:49   ` KOSAKI Motohiro
2010-10-19  5:33     ` Nick Piggin
2010-10-19  5:40       ` KOSAKI Motohiro
2010-10-19  3:42 ` [patch 04/35] vfs: convert inode and dentry caches to " npiggin
2010-10-19  3:42 ` [patch 05/35] fs: icache lock s_inodes list npiggin
2010-10-19  3:42 ` [patch 06/35] fs: icache lock inode hash npiggin
2010-10-19  3:42 ` [patch 07/35] fs: icache lock i_state npiggin
2010-10-19 10:47   ` Miklos Szeredi
2010-10-19 17:06     ` Peter Zijlstra
2010-10-19  3:42 ` [patch 08/35] fs: icache lock i_count npiggin
2010-10-19 10:16   ` Boaz Harrosh
2010-10-20  2:14     ` Nick Piggin
2010-10-19  3:42 ` [patch 09/35] fs: icache lock lru/writeback lists npiggin
2010-10-19  3:42 ` [patch 10/35] fs: icache atomic inodes_stat npiggin
2010-10-19  3:42 ` [patch 11/35] fs: icache lock inode state npiggin
2010-10-19  3:42 ` [patch 12/35] fs: inode atomic last_ino, iunique lock npiggin
2010-10-19  3:42 ` [patch 13/35] fs: icache remove inode_lock npiggin
2010-10-19  3:42 ` [patch 14/35] fs: icache factor hash lock into functions npiggin
2010-10-19  3:42 ` [patch 15/35] fs: icache per-bucket inode hash locks npiggin
2010-10-19  3:42 ` [patch 16/35] fs: icache lazy inode lru npiggin
2010-10-19  3:42 ` [patch 17/35] fs: icache RCU free inodes npiggin
2010-10-19  3:42 ` [patch 18/35] fs: avoid inode RCU freeing for pseudo fs npiggin
2010-10-19  3:42 ` [patch 19/35] fs: icache remove redundant i_sb_list umount locking npiggin
2010-10-20 12:46   ` Al Viro
2010-10-20 13:03     ` Nick Piggin
2010-10-20 13:27       ` Al Viro
2010-10-19  3:42 ` [patch 20/35] fs: icache rcu walk for i_sb_list npiggin
2010-10-19  3:42 ` [patch 21/35] fs: icache per-cpu nr_inodes, non-atomic nr_unused counters npiggin
2010-10-19  3:42 ` [patch 22/35] fs: icache per-cpu last_ino allocator npiggin
2010-10-19  3:42 ` [patch 23/35] fs: icache use per-CPU lists and locks for sb inode lists npiggin
2010-10-19 15:33   ` Miklos Szeredi
2010-10-20  2:37     ` Nick Piggin
2010-10-19  3:42 ` [patch 24/35] fs: icache use RCU to avoid locking in hash lookups npiggin
2010-10-19  3:42 ` [patch 25/35] fs: icache reduce some locking overheads npiggin
2010-10-19  3:42 ` [patch 26/35] fs: icache alloc anonymous inode allocation npiggin
2010-10-19 15:50   ` Miklos Szeredi
2010-10-20  2:38     ` Nick Piggin
2010-10-19 16:33   ` Christoph Hellwig [this message]
2010-10-20  3:07     ` Nick Piggin
2010-10-19  3:42 ` [patch 27/35] fs: icache split IO and LRU lists npiggin
2010-10-19 16:12   ` Miklos Szeredi
2010-10-20  2:41     ` Nick Piggin
2010-10-19  3:42 ` [patch 28/35] fs: icache split writeback and lru locks npiggin
2010-10-19  3:42 ` [patch 29/35] fs: icache per-bdi writeback list locking npiggin
2010-10-19  3:42 ` [patch 30/35] fs: icache lazy LRU avoid LRU locking after IO operation npiggin
2010-10-19  3:42 ` [patch 31/35] fs: icache per-zone inode LRU npiggin
2010-10-19 12:38   ` Dave Chinner
2010-10-20  2:35     ` Nick Piggin
2010-10-20  3:12       ` Nick Piggin
2010-10-20  9:43         ` Dave Chinner
2010-10-20 10:02           ` Nick Piggin
2010-10-20  3:14     ` KOSAKI Motohiro
2010-10-20  3:20       ` Nick Piggin
2010-10-20  3:29         ` KOSAKI Motohiro
2010-10-20 10:19         ` Dave Chinner
2010-10-20 10:41           ` Nick Piggin
2010-10-19  3:42 ` [patch 32/35] fs: icache minimise I_FREEING latency npiggin
2010-10-19  3:42 ` [patch 33/35] fs: icache introduce inode_get/inode_get_ilock npiggin
2010-10-19 10:17   ` Boaz Harrosh
2010-10-20  2:17     ` Nick Piggin
2010-10-19  3:42 ` [patch 34/35] fs: inode rename i_count to i_refs npiggin
2010-10-19  3:42 ` [patch 35/35] fs: icache document more lock orders npiggin
2010-10-19 16:22 ` [patch 00/35] my inode scaling series for review Christoph Hellwig
2010-10-20  3:05   ` Nick Piggin
2010-10-20 13:14 ` Al Viro
2010-10-20 13:59   ` Nick Piggin

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