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fs: Convert nr_inodes and nr_unused to per-cpu counters

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The number of inodes allocated does not need to be tied to the
addition or removal of an inode to/from a list. If we are not tied
to a list lock, we could update the counters when inodes are
initialised or destroyed, but to do that we need to convert the
counters to be per-cpu (i.e. independent of a lock). This means that
we have the freedom to change the list/locking implementation
without needing to care about the counters.

Based on a patch originally from Eric Dumazet.

[AV: cleaned up a bit, fixed build breakage on weird configs

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Dave Chinner 2010-10-23 05:03:02 -04:00 • committed by Al Viro
parent be1a16a0ae
commit cffbc8aa33
5 changed files with 52 additions and 25 deletions
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5
fs/fs-writeback.c
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@ -723,7 +723,7 @@ static long wb_check_old_data_flush(struct bdi_writeback *wb)
wb->last_old_flush = jiffies;
nr_pages = global_page_state(NR_FILE_DIRTY) +
global_page_state(NR_UNSTABLE_NFS) +
(inodes_stat.nr_inodes - inodes_stat.nr_unused);
get_nr_dirty_inodes();
if (nr_pages) {
struct wb_writeback_work work = {
@ -1090,8 +1090,7 @@ void writeback_inodes_sb(struct super_block *sb)
WARN_ON(!rwsem_is_locked(&sb->s_umount));
work.nr_pages = nr_dirty + nr_unstable +
(inodes_stat.nr_inodes - inodes_stat.nr_unused);
work.nr_pages = nr_dirty + nr_unstable + get_nr_dirty_inodes();
bdi_queue_work(sb->s_bdi, &work);
wait_for_completion(&done);