Andrew Morton <[email protected]> wrote:
>
> If so, why would that happen? Take a look at wb_kupdate(). It's supposed
> to work *continuously* on the inodes until writeback_inodes() failed to
> write back enough pages. It takes this as an indication that there's no
> more work to do at this time.
>
> It'd be interesting to take a look at what's happening in wb_kupdate().
Took a quick look at xfs_convert_page(). I don't immediately see a cause
in there, but
if (count) {
struct backing_dev_info *bdi;
bdi = inode->i_mapping->backing_dev_info;
if (bdi_write_congested(bdi)) {
wbc->encountered_congestion = 1;
done = 1;
} else if (--wbc->nr_to_write <= 0) {
done = 1;
}
}
xfs_start_page_writeback(page, wbc, !page_dirty, count);
shouldn't we be decrementing wbc->nr_to_write even if the queue is congested?
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