linux-kernel - Re: [PATCH 0/4] irq: fix support for allocating sets of IRQs

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Date:   Sun, 4 Nov 2018 19:39:59 +0100 (CET)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Jens Axboe <axboe@...nel.dk>
cc:     Ming Lei <ming.lei@...hat.com>, linux-block@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>,
        Hannes Reinecke <hare@...e.com>,
        Keith Busch <keith.busch@...el.com>,
        Sagi Grimberg <sagi@...mberg.me>,
        Long Li <longli@...rosoft.com>
Subject: Re: [PATCH 0/4] irq: fix support for allocating sets of IRQs

On Sun, 4 Nov 2018, Jens Axboe wrote:

Cc'ing Long with a hopefully working E-Mail address. The previous one
bounced because I stupidly copied the wrong one...

> On 11/4/18 5:02 AM, Thomas Gleixner wrote:
> > Jens,
> > 
> > On Sat, 3 Nov 2018, Jens Axboe wrote:
> > 
> >> On 11/2/18 8:59 AM, Ming Lei wrote:
> >>> Hi Jens,
> >>>
> >>> As I mentioned, there are at least two issues in the patch of '
> >>> irq: add support for allocating (and affinitizing) sets of IRQs':
> >>>
> >>> 1) it is wrong to pass 'mask + usedvec' to irq_build_affinity_masks()
> >>>
> >>> 2) we should spread all possible CPUs in 2-stage way on each set of IRQs
> >>>
> >>> The fix isn't trivial, and I introduce two extra patches as preparation,
> >>> then the implementation can be more clean.
> >>>
> >>> The patchset is against mq-maps branch of block tree, feel free to
> >>> integrate into the whole patchset of multiple queue maps.
> >>
> >> Thanks Ming, I ran this through my testing, and I end up with the
> >> same maps and affinities for all the cases I cared about. I'm going
> >> to drop my initial version, and add the three.
> > 
> > So I assume, that I can pick up Mings series instead.
> 
> Yes, let's do that.
> 
> > There is another patch pending affecting the irq affinity spreading. Can
> > you folks please have a look at it?
> > 
> > https://lkml.kernel.org/r/20181102180248.13583-1-longli@linuxonhyperv.com
> 
> I'll give that a look and test. Thanks for the heads-up.
> 
> -- 
> Jens Axboe
> 
>