On 1/13/18 4:05 AM, Paolo Valente wrote: > Hi Jens, > here are again the two pending patches you asked me to resend [1]. One > of them, fixing read-starvation problems, was accompanied by a cover > letter. I'm pasting the content of that cover letter below. > > The patch addresses (serious) starvation problems caused by > request-tag exhaustion, as explained in more detail in the commit > message. I started from the solution in the function > kyber_limit_depth, but then I had to define more articulate limits, to > counter starvation also in cases not covered in kyber_limit_depth. > If this solution proves to be effective, I'm willing to port it > somehow to the other schedulers. It's something we've been doing in the old request layer for tagging for a long time (more than a decade), so a generic (and fast) solution that covers all cases for blk-mq-tag would indeed be great. For now, I have applied these for 4.16, thanks. -- Jens Axboe
