linux-kernel.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Nick Piggin <npiggin@suse.de>
To: Eric Dumazet <eric.dumazet@gmail.com>
Cc: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
	John Stultz <johnstul@us.ibm.com>,
	Frank Mayhar <fmayhar@google.com>
Subject: Re: [patch 01/52] kernel: add bl_list
Date: Fri, 25 Jun 2010 00:42:28 +1000	[thread overview]
Message-ID: <20100624144228.GC10441@laptop> (raw)
In-Reply-To: <1277359462.3471.1156.camel@edumazet-laptop>

On Thu, Jun 24, 2010 at 08:04:22AM +0200, Eric Dumazet wrote:
> Le jeudi 24 juin 2010 à 13:02 +1000, npiggin@suse.de a écrit :
> > +static inline void hlist_bl_set_first(struct hlist_bl_head *h, struct hlist_bl_node *n)
> > +{
> > +	h->first = (struct hlist_bl_node *)((unsigned long)n | ((unsigned long)h->first & 1UL));
> 
> Hmm, shouldnt hlist_bl_set_first() be used only with bit lock held ?
> 
> 	h->first = (struct hlist_bl_node *)((unsigned long)n | 1UL);
> > +}

I had it that way but changed it for some reason. Thinking about it
again though, you're right I'm sure (it could have been some other
bug in my code making me think I needed it).

Thanks.

> > +static inline void hlist_bl_set_first_rcu(struct hlist_bl_head *h, struct hlist_bl_node *n)
> > +{
> > +	rcu_assign_pointer(h->first, (struct hlist_bl_node *)((unsigned long)n | ((unsigned long)h->first & 1UL)));
> 
> Same question here.
> 
> > +}
> > +
> > +static inline struct hlist_bl_node *hlist_bl_first_rcu(struct hlist_bl_head *h)
> > +{
> > +	return (struct hlist_bl_node *)((unsigned long)rcu_dereference(h->first) & ~1UL);
> > +}
> 
> 
> Looks really nice Nick, maybe we should push this so that other
> subsystem can start using it.

Sure, if you have an interest in using it, it will be trivial to send
upstream. Should we merge it before any users appear? I don't know...


  reply	other threads:[~2010-06-24 14:42 UTC|newest]

Thread overview: 152+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-06-24  3:02 [patch 00/52] vfs scalability patches updated npiggin
2010-06-24  3:02 ` [patch 01/52] kernel: add bl_list npiggin
2010-06-24  6:04   ` Eric Dumazet
2010-06-24 14:42     ` Nick Piggin [this message]
2010-06-24 16:01       ` Eric Dumazet
2010-06-28 21:37   ` Paul E. McKenney
2010-06-29  6:30     ` Nick Piggin
2010-06-24  3:02 ` [patch 02/52] fs: fix superblock iteration race npiggin
2010-06-29 13:02   ` Christoph Hellwig
2010-06-29 14:56     ` Nick Piggin
2010-06-29 17:35       ` Linus Torvalds
2010-06-29 17:41         ` Nick Piggin
2010-06-29 17:52           ` Linus Torvalds
2010-06-29 17:58             ` Linus Torvalds
2010-06-29 20:04               ` Chris Clayton
2010-06-29 20:14                 ` Nick Piggin
2010-06-29 20:38                   ` Chris Clayton
2010-06-30  7:13                     ` Chris Clayton
2010-06-30 12:51               ` Al Viro
2010-06-24  3:02 ` [patch 03/52] fs: fs_struct rwlock to spinlock npiggin
2010-06-24  3:02 ` [patch 04/52] fs: cleanup files_lock npiggin
2010-06-24  3:02 ` [patch 05/52] lglock: introduce special lglock and brlock spin locks npiggin
2010-06-24 18:15   ` Thomas Gleixner
2010-06-25  6:22     ` Nick Piggin
2010-06-25  9:50       ` Thomas Gleixner
2010-06-25 10:11         ` Nick Piggin
2010-06-24  3:02 ` [patch 06/52] fs: scale files_lock npiggin
2010-06-24  7:52   ` Peter Zijlstra
2010-06-24 15:00     ` Nick Piggin
2010-06-24  3:02 ` [patch 07/52] fs: brlock vfsmount_lock npiggin
2010-06-24  3:02 ` [patch 08/52] fs: scale mntget/mntput npiggin
2010-06-24  3:02 ` [patch 09/52] fs: dcache scale hash npiggin
2010-06-24  3:02 ` [patch 10/52] fs: dcache scale lru npiggin
2010-06-24  3:02 ` [patch 11/52] fs: dcache scale nr_dentry npiggin
2010-06-24  3:02 ` [patch 12/52] fs: dcache scale dentry refcount npiggin
2010-06-24  3:02 ` [patch 13/52] fs: dcache scale d_unhashed npiggin
2010-06-24  3:02 ` [patch 14/52] fs: dcache scale subdirs npiggin
2010-06-24  7:56   ` Peter Zijlstra
2010-06-24  9:50   ` Andi Kleen
2010-06-24 15:53     ` Nick Piggin
2010-06-24  3:02 ` [patch 15/52] fs: dcache scale inode alias list npiggin
2010-06-24  3:02 ` [patch 16/52] fs: dcache RCU for multi-step operaitons npiggin
2010-06-24  7:58   ` Peter Zijlstra
2010-06-24 15:03     ` Nick Piggin
2010-06-24 17:22       ` john stultz
2010-06-24 17:26   ` john stultz
2010-06-25  6:45     ` Nick Piggin
2010-06-24  3:02 ` [patch 17/52] fs: dcache remove dcache_lock npiggin
2010-06-24  3:02 ` [patch 18/52] fs: dcache reduce dput locking npiggin
2010-06-24  3:02 ` [patch 19/52] fs: dcache per-bucket dcache hash locking npiggin
2010-06-24  3:02 ` [patch 20/52] fs: dcache reduce dcache_inode_lock npiggin
2010-06-24  3:02 ` [patch 21/52] fs: dcache per-inode inode alias locking npiggin
2010-06-24  3:02 ` [patch 22/52] fs: dcache rationalise dget variants npiggin
2010-06-24  3:02 ` [patch 23/52] fs: dcache percpu nr_dentry npiggin
2010-06-24  3:02 ` [patch 24/52] fs: dcache reduce d_parent locking npiggin
2010-06-24  8:44   ` Peter Zijlstra
2010-06-24 15:07     ` Nick Piggin
2010-06-24 15:32       ` Paul E. McKenney
2010-06-24 16:05         ` Nick Piggin
2010-06-24 16:41           ` Paul E. McKenney
2010-06-28 21:50   ` Paul E. McKenney
2010-07-07 14:35     ` Nick Piggin
2010-06-24  3:02 ` [patch 25/52] fs: dcache DCACHE_REFERENCED improve npiggin
2010-06-24  3:02 ` [patch 26/52] fs: icache lock s_inodes list npiggin
2010-06-24  3:02 ` [patch 27/52] fs: icache lock inode hash npiggin
2010-06-24  3:02 ` [patch 28/52] fs: icache lock i_state npiggin
2010-06-24  3:02 ` [patch 29/52] fs: icache lock i_count npiggin
2010-06-30  7:27   ` Dave Chinner
2010-06-30 12:05     ` Nick Piggin
2010-07-01  2:36       ` Dave Chinner
2010-07-01  7:54         ` Nick Piggin
2010-07-01  9:36           ` Nick Piggin
2010-07-01 16:21           ` Frank Mayhar
2010-07-03  2:03       ` Andrew Morton
2010-07-03  3:41         ` Nick Piggin
2010-07-03  4:31           ` Andrew Morton
2010-07-03  5:06             ` Nick Piggin
2010-07-03  5:18               ` Nick Piggin
2010-07-05 22:41               ` Dave Chinner
2010-07-06  4:34                 ` Nick Piggin
2010-07-06 10:38                   ` Theodore Tso
2010-07-06 13:04                     ` Nick Piggin
2010-07-07 17:00                     ` Frank Mayhar
2010-06-24  3:02 ` [patch 30/52] fs: icache lock lru/writeback lists npiggin
2010-06-24  8:58   ` Peter Zijlstra
2010-06-24 15:09     ` Nick Piggin
2010-06-24 15:13       ` Peter Zijlstra
2010-06-24  3:02 ` [patch 31/52] fs: icache atomic inodes_stat npiggin
2010-06-24  3:02 ` [patch 32/52] fs: icache protect inode state npiggin
2010-06-24  3:02 ` [patch 33/52] fs: icache atomic last_ino, iunique lock npiggin
2010-06-24  3:02 ` [patch 34/52] fs: icache remove inode_lock npiggin
2010-06-24  3:02 ` [patch 35/52] fs: icache factor hash lock into functions npiggin
2010-06-24  3:02 ` [patch 36/52] fs: icache per-bucket inode hash locks npiggin
2010-06-24  3:02 ` [patch 37/52] fs: icache lazy lru npiggin
2010-06-24  9:52   ` Andi Kleen
2010-06-24 15:59     ` Nick Piggin
2010-06-30  8:38   ` Dave Chinner
2010-06-30 12:06     ` Nick Piggin
2010-07-01  2:46       ` Dave Chinner
2010-07-01  7:57         ` Nick Piggin
2010-06-24  3:02 ` [patch 38/52] fs: icache RCU free inodes npiggin
2010-06-30  8:57   ` Dave Chinner
2010-06-30 12:07     ` Nick Piggin
2010-06-24  3:02 ` [patch 39/52] fs: icache rcu walk for i_sb_list npiggin
2010-06-24  3:02 ` [patch 40/52] fs: dcache improve scalability of pseudo filesystems npiggin
2010-06-24  3:02 ` [patch 41/52] fs: icache reduce atomics npiggin
2010-06-24  3:02 ` [patch 42/52] fs: icache per-cpu last_ino allocator npiggin
2010-06-24  9:48   ` Andi Kleen
2010-06-24 15:52     ` Nick Piggin
2010-06-24 16:19       ` Andi Kleen
2010-06-24 16:38         ` Nick Piggin
2010-06-24  3:02 ` [patch 43/52] fs: icache per-cpu nr_inodes counter npiggin
2010-06-24  3:02 ` [patch 44/52] fs: icache per-CPU sb inode lists and locks npiggin
2010-06-30  9:26   ` Dave Chinner
2010-06-30 12:08     ` Nick Piggin
2010-07-01  3:12       ` Dave Chinner
2010-07-01  8:00         ` Nick Piggin
2010-06-24  3:02 ` [patch 45/52] fs: icache RCU hash lookups npiggin
2010-06-24  3:02 ` [patch 46/52] fs: icache reduce locking npiggin
2010-06-24  3:02 ` [patch 47/52] fs: keep inode with backing-dev npiggin
2010-06-24  3:03 ` [patch 48/52] fs: icache split IO and LRU lists npiggin
2010-06-24  3:03 ` [patch 49/52] fs: icache scale writeback list locking npiggin
2010-06-24  3:03 ` [patch 50/52] mm: implement per-zone shrinker npiggin
2010-06-24 10:06   ` Andi Kleen
2010-06-24 16:00     ` Nick Piggin
2010-06-24 16:27       ` Andi Kleen
2010-06-24 16:32         ` Andi Kleen
2010-06-24 16:37         ` Andi Kleen
2010-06-30  6:28   ` Dave Chinner
2010-06-30 12:03     ` Nick Piggin
2010-06-24  3:03 ` [patch 51/52] fs: per-zone dentry and inode LRU npiggin
2010-06-30 10:09   ` Dave Chinner
2010-06-30 12:13     ` Nick Piggin
2010-06-24  3:03 ` [patch 52/52] fs: icache less I_FREEING time npiggin
2010-06-30 10:13   ` Dave Chinner
2010-06-30 12:14     ` Nick Piggin
2010-07-01  3:33       ` Dave Chinner
2010-07-01  8:06         ` Nick Piggin
2010-06-25  7:12 ` [patch 00/52] vfs scalability patches updated Christoph Hellwig
2010-06-25  8:05   ` Nick Piggin
2010-06-30 11:30 ` Dave Chinner
2010-06-30 12:40   ` Nick Piggin
2010-07-01  3:56     ` Dave Chinner
2010-07-01  8:20       ` Nick Piggin
2010-07-01 17:36       ` Andi Kleen
2010-07-01 17:23     ` Nick Piggin
2010-07-01 17:28       ` Andi Kleen
2010-07-06 17:49       ` Nick Piggin
2010-07-01 17:35     ` Linus Torvalds
2010-07-01 17:52       ` Nick Piggin
2010-07-02  4:01       ` Paul E. McKenney
2010-06-30 17:08   ` Frank Mayhar

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20100624144228.GC10441@laptop \
    --to=npiggin@suse.de \
    --cc=eric.dumazet@gmail.com \
    --cc=fmayhar@google.com \
    --cc=johnstul@us.ibm.com \
    --cc=linux-fsdevel@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).