On Wed, Jul 01, 2020 at 06:57:47PM +0100, Matthew Wilcox wrote: > On Wed, Jul 01, 2020 at 12:41:03PM -0400, Mike Snitzer wrote: > > On Wed, Jul 01 2020 at 5:06am -0400, > > Christoph Hellwig <hch@xxxxxx> wrote: > > > > > Hi Jens, > > > > > > we have a lot of bdi congestion related code that is left around without > > > any use. This series removes it in preparation of sorting out the bdi > > > lifetime rules properly. > > > > I could do some git archeology to see what the fs, mm and block core > > changes were to stop using bdi congested but a pointer to associated > > changes (or quick recap) would save me some time. > > > > Also, curious to know how back-pressure should be felt back up the IO > > stack now? (apologies if these are well worn topics, I haven't been > > tracking this area of development). > > It isn't. Jens declared the implementation was broken, and broke it > more. So we're just living with stupid broken timeouts. Here's a thread about it. This would have been a discussion topic at LSFMM2020, but COVID. https://lore.kernel.org/linux-mm/20190917115824.16990-1-linf@xxxxxxxxxx/T/#u
