From mboxrd@z Thu Jan 1 00:00:00 1970 From: hch@lst.de (Christoph Hellwig) Date: Mon, 6 Feb 2017 18:03:13 +0100 Subject: [PATCH 1/6] genirq: allow assigning affinity to present but not online CPUs In-Reply-To: <20170206170304.GF24601@localhost.localdomain> References: <20170204015809.GA16203@zipoli.ccur.kvm> <20170205164023.GA9281@lst.de> <20170206170304.GF24601@localhost.localdomain> Message-ID: <20170206170313.GB31902@lst.de> On Mon, Feb 06, 2017@12:03:05PM -0500, Keith Busch wrote: > Can we use the online CPUs and create a new hot-cpu notifier to the nvme > driver to free/reallocate as needed? We were doing that before blk-mq. Now > blk-mq can change the number hardware contexts on a live queue, so we > can reintroduce that behavior to nvme and only allocate what we need. That could be a next step, but given how badly I keep messing up core IRQ bits we'll probably want to wait for two rewrites of those bits from Thomas before moving on :)