-int vm_dirty_ratio = 40;
+int vm_dirty_ratio = 80;
I don't think you can do that. Because ...
unsigned long available_memory = total_pages;
...
+ dirty = (vm_dirty_ratio * available_memory) / 100;
... there are other things in memory besides pagecache. Limiting
dirty pages to 80% of pagecache might be fine, but not 80%
of total memory.
dirty = (vm_dirty_ratio * (nr_active + nr_inactive)) / 100
might be more sensible. Frankly the whole thing is a crock
anyway, because we should be counting easily freeable clean
pages, not dirty pages, but still.
M.
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