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Date: Tue, 23 Jun 2020 19:13:48 -0400 From: Tejun Heo <tj@...nel.org> To: Rick Lindsley <ricklind@...ux.vnet.ibm.com> Cc: Ian Kent <raven@...maw.net>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Stephen Rothwell <sfr@...b.auug.org.au>, Andrew Morton <akpm@...ux-foundation.org>, Al Viro <viro@...iv.linux.org.uk>, David Howells <dhowells@...hat.com>, Miklos Szeredi <miklos@...redi.hu>, linux-fsdevel <linux-fsdevel@...r.kernel.org>, Kernel Mailing List <linux-kernel@...r.kernel.org> Subject: Re: [PATCH v2 0/6] kernfs: proposed locking and concurrency improvement Hello, Rick. On Mon, Jun 22, 2020 at 02:22:34PM -0700, Rick Lindsley wrote: > > I don't know. The above highlights the absurdity of the approach itself to > > me. You seem to be aware of it too in writing: 250,000 "devices". > > Just because it is absurd doesn't mean it wasn't built that way :) > > I agree, and I'm trying to influence the next hardware design. However, I'm not saying that the hardware should not segment things into however many pieces that it wants / needs to. That part is fine. > what's already out there is memory units that must be accessed in 256MB > blocks. If you want to remove/add a GB, that's really 4 blocks of memory > you're manipulating, to the hardware. Those blocks have to be registered > and recognized by the kernel for that to work. The problem is fitting that into an interface which wholly doesn't fit that particular requirement. It's not that difficult to imagine different ways to represent however many memory slots, right? It'd take work to make sure that integrates well with whatever tooling or use cases but once done this particular problem will be resolved permanently and the whole thing will look a lot less silly. Wouldn't that be better? Thanks. -- tejun
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