Messages in this thread | | | Date | Wed, 6 May 2015 16:26:24 +0200 | From | Peter Zijlstra <> | Subject | Re: [PATCH v2] Support for write stream IDs |
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On Tue, May 05, 2015 at 06:09:18PM -0400, Martin K. Petersen wrote: > >>>>> "Jens" == Jens Axboe <axboe@fb.com> writes: > > Jens> I'm not trying to make a shortcut. I deliberately do not want to > Jens> make ID generation/assignment part of the kernel. There's no > Jens> reason that can't exist outside of the kernel, in a libstreamid or > Jens> similar. > > That just perpetuates the broken model, though. Why wouldn't we want to > have stream ids readily available inside the kernel to tag journals, > filesystem metadata, data migration, who knows what?
> The only sensible solution is for the kernel to manage the stream > IDs. And for them to be plentiful. The storage device is free to ignore > them, do LRU or whatever it pleases to manage them if it has an internal > limit on number of open streams, etc.
I agree; one of the primary tasks of an operating system kernel is arbitrage and control of hardware resources.
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