Tejun Heo wrote:
Yeah, Forrest pointed out the same thing and I've converted hotplug_wq to single threaded variant, which should be enough for SCSI hotplugging. For ata_wq, I think it's wiser to keep it multi-threaded for the time being. Maybe what should be done is to allocate a single threaded workqueue per host_set.
One thread per host_set would suck for any situation where that's doing ATAPI or PIO tasks. Would love to find a good metric...
$BIGNUM CPU boxes tend to have $BIGNUM GB of memories, so multithreaded wq might not be that critical resource-wise. But, still, inefficient
That's a bad assumption on modern machines. Think of a single 16-core, 8-thread SPARC Niagara CPU, for example :)
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