Re: migratepage failures on reiserfs

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On Tue, 30 Oct 2007 10:27:04 -0800
Badari Pulavarty <pbadari@xxxxxxxxxx> wrote:

> Hi,
> 
> While testing hotplug memory remove, I ran into this issue. Given a
> range of pages hotplug memory remove tries to migrate those pages.
> 
> migrate_pages() keeps failing to migrate pages containing pagecache
> pages for reiserfs files. I noticed that reiserfs doesn't have 
> ->migratepage() ops. So, fallback_migrate_page() code tries to
> do try_to_release_page(). try_to_release_page() fails to
> drop_buffers() since b_count == 1. Here is what my debug shows:
> 
> 	migrate pages failed pfn 258111/flags 3f00000000801
> 	bh c00000000b53f6e0 flags 110029 count 1
> 	
> Any one know why the b_count == 1 and not getting dropped to zero ? 

If these are file data pages, the count is probably elevated as part of
the data=ordered tracking.  You can verify this via b_private, or just
mount data=writeback to double check.

-chris
-
To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html

[Index of Archives]     [Linux Ext4 Filesystem]     [Union Filesystem]     [Filesystem Testing]     [Ceph Users]     [Ecryptfs]     [AutoFS]     [Kernel Newbies]     [Share Photos]     [Security]     [Netfilter]     [Bugtraq]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux Cachefs]     [Reiser Filesystem]     [Linux RAID]     [Samba]     [Device Mapper]     [CEPH Development]
  Powered by Linux