On Tue, 13 Nov 2007, Erez Zadok wrote:
>
> I posted all of these patches just now. You're CC'ed. Hopefully Andrew can
> pull from my unionfs.git branch soon.
>
> You also reported in your previous emails some hangs/oopses while doing make
> -j 20 in unionfs on top of a single tmpfs, using -mm. After several days,
> I've not been able to reproduce this w/ my latest set of patches. If you
> can send me your .config and the specs on the h/w you're using (cpus, mem,
> etc.), I'll see if I can find something similar to it on my end and run the
> same tests.
I'm glad to report that this unionfs, not the one in 2.6.24-rc2-mm1
but the one including those 9 patches you posted, now gets through
my testing with tmpfs without a problem. I do still get occasional
"unionfs: new lower inode mtime (bindex=0, name=<directory>)"
messages, but nothing worse seen yet: a big improvement.
I deceived myself for a while that the danger of shmem_writepage
hitting its BUG_ON(entry->val) was dealt with too; but that's wrong,
I must go back to working out an escape from that one (despite never
seeing it).
I did think you could clean up the doubled set_page_dirtys,
but it's of no consequence.
Hugh
--- 2.6.24-rc2-mm1+9/fs/unionfs/mmap.c 2007-11-17 12:23:30.000000000 +0000
+++ linux/fs/unionfs/mmap.c 2007-11-17 20:22:29.000000000 +0000
@@ -56,6 +56,7 @@ static int unionfs_writepage(struct page
copy_highpage(lower_page, page);
flush_dcache_page(lower_page);
SetPageUptodate(lower_page);
+ set_page_dirty(lower_page);
/*
* Call lower writepage (expects locked page). However, if we are
@@ -66,12 +67,11 @@ static int unionfs_writepage(struct page
* success.
*/
if (wbc->for_reclaim) {
- set_page_dirty(lower_page);
unlock_page(lower_page);
goto out_release;
}
+
BUG_ON(!lower_mapping->a_ops->writepage);
- set_page_dirty(lower_page);
clear_page_dirty_for_io(lower_page); /* emulate VFS behavior */
err = lower_mapping->a_ops->writepage(lower_page, wbc);
if (err < 0)
-
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