On 10/27/22 4:14 PM, Pavel Begunkov wrote: > There are ways to deprive bioset mempool of requests using pcpu caches > and never return them back, which breaks forward progress guarantees bioset > tried to provide. Fix it. > > Pavel Begunkov (2): > mempool: introduce mempool_is_saturated > bio: don't rob bios from starving bioset > > block/bio.c | 2 ++ > include/linux/mempool.h | 5 +++++ > 2 files changed, 7 insertions(+) > This isn't really a concern for 6.1 and earlier, because the caching is just for polled IO. Polled IO will not be grabbing any of the reserved inflight units on the mempool side, which is what guarantees the forward progress. It'll be a concern for the 6.2 irq based general caching, so it would need to be handled there. So perhaps this can be a pre-series for a reposting of that patchset. -- Jens Axboe
