From: Theodore Tso <tytso@mit.edu>
To: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: linux-ext4@vger.kernel.org, linux-kernel@vger.kernel.org,
Mingming Cao <cmm@us.ibm.com>,
Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [PATCH 01/42] percpu counter: clean up percpu_counter_sum_and_set()
Date: Thu, 9 Oct 2008 12:52:33 -0400 [thread overview]
Message-ID: <20081009165233.GH17512@mit.edu> (raw)
In-Reply-To: <1223542372.7382.30.camel@lappy.programming.kicks-ass.net>
On Thu, Oct 09, 2008 at 10:52:52AM +0200, Peter Zijlstra wrote:
> On Thu, 2008-10-09 at 00:05 -0400, Theodore Ts'o wrote:
> > From: Mingming Cao <cmm@us.ibm.com>
> >
> > percpu_counter_sum_and_set() and percpu_counter_sum() is the same except
> > the former updates the global counter after accounting. Since we are
> > taking the fbc->lock to calculate the precise value of the counter in
> > percpu_counter_sum() anyway, it should simply set fbc->count too, as the
> > percpu_counter_sum_and_set() does.
> >
> > This patch merge these two interfaces into one.
>
> I totally missed the patch introducing this _and_set() horror, but this
> does look like a good cleanup.
Note: this patch was in the -mm tree (Andrew signed off on it), but
given that a number of ext4 patches depend on it, we have a copy of it
in the ext4 tree.
- Ted
prev parent reply other threads:[~2008-10-09 16:52 UTC|newest]
Thread overview: 61+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-10-09 4:05 [PATCH 0/42] Ext4 patches queued up for the 2.6.28 merge window Theodore Ts'o
2008-10-09 4:05 ` [PATCH 01/42] percpu counter: clean up percpu_counter_sum_and_set() Theodore Ts'o
2008-10-09 4:05 ` [PATCH 02/42] ext4: Add printk priority levels to clean up checkpatch warnings Theodore Ts'o
2008-10-09 4:05 ` [PATCH 03/42] ext4: Fix long long " Theodore Ts'o
2008-10-09 4:05 ` [PATCH 04/42] ext4: Fix whitespace checkpatch warnings/errors Theodore Ts'o
2008-10-09 4:05 ` [PATCH 05/42] ext4: invalidate pages if delalloc block allocation fails Theodore Ts'o
2008-10-09 4:05 ` [PATCH 06/42] ext4: Make sure all the block allocation paths reserve blocks Theodore Ts'o
2008-10-09 4:05 ` Theodore Ts'o
2008-10-09 4:05 ` [PATCH 07/42] ext4: Retry block reservation Theodore Ts'o
2008-10-09 4:05 ` [PATCH 08/42] ext4: Add percpu dirty block accounting Theodore Ts'o
2008-10-09 4:05 ` [PATCH 09/42] ext4: Switch to non delalloc mode when we are low on free blocks count Theodore Ts'o
2008-10-09 4:05 ` [PATCH 10/42] ext4: Signed arithmetic fix Theodore Ts'o
2008-10-09 4:05 ` [PATCH 11/42] ext4: Fix ext4 nomballoc allocator for ENOSPC Theodore Ts'o
2008-10-09 4:05 ` [PATCH 12/42] ext4: Don't add the inode to journal handle until after the block is allocated Theodore Ts'o
2008-10-09 4:05 ` [PATCH 13/42] ext4: Retry block allocation if we have free blocks left Theodore Ts'o
2008-10-09 4:05 ` Theodore Ts'o
2008-10-09 4:05 ` [PATCH 14/42] ext4: truncate block allocated on a failed ext4_write_begin Theodore Ts'o
2008-10-09 4:05 ` [PATCH 15/42] ext4: Properly update i_disksize Theodore Ts'o
2008-10-09 4:05 ` [PATCH 16/42] ext4: Avoid printk floods in the face of directory corruption Theodore Ts'o
2008-10-09 4:05 ` [PATCH 17/42] Update flex_bg free blocks and free inodes counters when resizing Theodore Ts'o
2008-10-09 4:05 ` [PATCH 18/42] ext4: fix #11321: create /proc/ext4/*/stats more carefully Theodore Ts'o
2008-10-09 4:05 ` [PATCH 19/42] jbd2: clean up how the journal device name is printed Theodore Ts'o
2008-10-09 4:05 ` [PATCH 20/42] ext4: add missing unlock in ext4_check_descriptors() on error path Theodore Ts'o
2008-10-09 4:05 ` [PATCH 21/42] ext4: elevate write count for migrate ioctl Theodore Ts'o
2008-10-09 4:05 ` [PATCH 22/42] ext4: hook the ext3 migration interface to the EXT4_IOC_SETFLAGS ioctl Theodore Ts'o
2008-10-09 4:05 ` [PATCH 23/42] ext4: Renumber EXT4_IOC_MIGRATE Theodore Ts'o
2008-10-09 4:05 ` [PATCH 24/42] ext4: use percpu data structures for lg_prealloc_list Theodore Ts'o
2008-10-09 4:05 ` Theodore Ts'o
2008-10-09 4:05 ` [PATCH 25/42] ext4/jbd2: Avoid WARN() messages when failing to write to the superblock Theodore Ts'o
2008-10-09 4:05 ` [PATCH 26/42] ext4: Don't use 'struct dentry' for internal lookups Theodore Ts'o
2008-10-09 4:05 ` [PATCH 27/42] ext4: move /proc setup and teardown out of mballoc.c Theodore Ts'o
2008-10-09 4:05 ` [PATCH 28/42] ext4: Combine proc file handling into a single set of functions Theodore Ts'o
2008-10-09 4:05 ` [PATCH 29/42] ext4: Use readahead when reading an inode from the inode table Theodore Ts'o
2008-10-09 4:05 ` [PATCH 30/42] ext4: Remove old legacy block allocator Theodore Ts'o
2008-10-09 4:05 ` Theodore Ts'o
2008-10-09 4:05 ` [PATCH 31/42] ext4: fix initialization of UNINIT bitmap blocks Theodore Ts'o
2008-10-09 4:05 ` [PATCH 32/42] jbd2: abort instead of waiting for nonexistent transaction Theodore Ts'o
2008-10-09 4:05 ` [PATCH 33/42] ext4: Add debugging markers that can be used by systemtap Theodore Ts'o
2008-10-09 4:05 ` [PATCH 34/42] jbd2: Fix buffer head leak when writing the commit block Theodore Ts'o
2008-10-09 4:05 ` [PATCH 35/42] ext4: fix xattr deadlock Theodore Ts'o
[not found] ` <1223525160-9887-36-git-send-email-tytso-3s7WtUTddSA@public.gmane.org>
2008-10-09 4:05 ` [PATCH 36/42] vfs: vfs-level fiemap interface Theodore Ts'o
2008-10-09 4:05 ` Theodore Ts'o
2008-10-09 4:05 ` [PATCH 37/42] ocfs2: fiemap support Theodore Ts'o
2008-10-09 4:05 ` [Ocfs2-devel] " Theodore Ts'o
2008-10-09 4:05 ` [PATCH 38/42] generic block based fiemap implementation Theodore Ts'o
2008-10-09 4:05 ` [PATCH 39/42] Hook ext4 to the vfs fiemap interface Theodore Ts'o
2008-10-09 4:05 ` [PATCH 40/42] Update ext4 MAINTAINERS file Theodore Ts'o
2008-10-09 4:05 ` [PATCH 41/42] ext4: Avoid double dirtying of super block in ext4_put_super() Theodore Ts'o
2008-10-09 4:06 ` [PATCH 42/42] ext4: Rename ext4dev to ext4 Theodore Ts'o
2008-10-11 22:04 ` Jeremy Fitzhardinge
2008-10-11 22:04 ` Jeremy Fitzhardinge
2008-10-11 22:09 ` Eric Sandeen
2008-10-11 22:09 ` Eric Sandeen
2008-10-11 22:54 ` Jeremy Fitzhardinge
2008-10-11 22:54 ` Jeremy Fitzhardinge
2008-10-11 22:58 ` Theodore Tso
2008-10-11 23:08 ` Grant Coady
2008-10-12 1:06 ` Eric Sandeen
2008-10-09 8:18 ` [PATCH 29/42] ext4: Use readahead when reading an inode from the inode table Aneesh Kumar K.V
2008-10-09 8:52 ` [PATCH 01/42] percpu counter: clean up percpu_counter_sum_and_set() Peter Zijlstra
2008-10-09 16:52 ` Theodore Tso [this message]
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