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 ?
Thanks,
Badari
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