static long ratelimit_pages = 32;
static long total_pages; /* The total number of pages in the machine. */
-static int dirty_exceeded; /* Dirty mem may be over limit */
+static int dirty_exceeded __cacheline_aligned_in_smp; /* Dirty mem may be over limit */
/*
* When balance_dirty_pages decides that the caller needs to perform some
if (nr_reclaimable + wbs.nr_writeback <= dirty_thresh)
break;
- dirty_exceeded = 1;
+ if (!dirty_exceeded)
+ dirty_exceeded = 1;
/* Note: nr_reclaimable denotes nr_dirty + nr_unstable.
* Unstable writes are a feature of certain networked
blk_congestion_wait(WRITE, HZ/10);
}
- if (nr_reclaimable + wbs.nr_writeback <= dirty_thresh)
+ if (nr_reclaimable + wbs.nr_writeback <= dirty_thresh && dirty_exceeded)
dirty_exceeded = 0;
if (writeback_in_progress(bdi))
int do_writepages(struct address_space *mapping, struct writeback_control *wbc)
{
+ int ret;
+
if (wbc->nr_to_write <= 0)
return 0;
+ wbc->for_writepages = 1;
if (mapping->a_ops->writepages)
- return mapping->a_ops->writepages(mapping, wbc);
- return generic_writepages(mapping, wbc);
+ ret = mapping->a_ops->writepages(mapping, wbc);
+ else
+ ret = generic_writepages(mapping, wbc);
+ wbc->for_writepages = 0;
+ return ret;
}
/**
}
return TestClearPageDirty(page);
}
+EXPORT_SYMBOL(clear_page_dirty_for_io);
int test_clear_page_writeback(struct page *page)
{