[dm-devel] [PATCH 1/1] dm-cache writeback watermarks

[Steven Wilton]

Hi,

Further to my previoulsy posted patch, I have developed a patch that 
adds a high and low watermark as a percent of the cache disk, where 
dm-cache will attempt to keep a percentage of the cache in a dirty state 
to avoid writing so much data back to the slow disks.

It co-operates nicely with the other patch (although it may make it 
redundant in some ways), and I have tested that it compiles and works, 
and flushes all data when the watermarks are set to 0 using the 
following commands:
dmsetup message <vgname>-<lvname> 0 "writeback_low_watermark 0"
dmsetup message <vgname>-<lvname> 0 "writeback_high_watermark 0"

regards

Steven
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