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265 - A lot of [ext4-dio-unwrit] threads

If you are using ext4, you see a lot of ext4-dio-unwrit processes. You should not kill them.

# ps -ef | grep ext4-dio-unwrit | wc

449

If there are 64 CPUs, all processes might be 448( 64 x 7 = 448 ) + 1.

That is normal situation. The workqueues are created statically at mount time, one per cpu per file system.
There are some plans for a more efficient way of dealing with workqueues in general on systems with large numbers of CPU's.

 

 



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