linux-kernel - Re: [RFC] /dev/ioasid uAPI proposal

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Message-ID: <20210607180144.GL1002214@nvidia.com>
Date:   Mon, 7 Jun 2021 15:01:44 -0300
From:   Jason Gunthorpe <jgg@...dia.com>
To:     "Enrico Weigelt, metux IT consult" <lkml@...ux.net>
Cc:     Jason Wang <jasowang@...hat.com>,
        "Tian, Kevin" <kevin.tian@...el.com>,
        Lu Baolu <baolu.lu@...ux.intel.com>,
        Liu Yi L <yi.l.liu@...ux.intel.com>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        Jonathan Corbet <corbet@....net>,
        "iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
        LKML <linux-kernel@...r.kernel.org>,
        "Alex Williamson (alex.williamson@...hat.com)\"\"" 
        <alex.williamson@...hat.com>, David Woodhouse <dwmw2@...radead.org>
Subject: Re: [RFC] /dev/ioasid uAPI proposal

On Mon, Jun 07, 2021 at 03:30:21PM +0200, Enrico Weigelt, metux IT consult wrote:
> On 02.06.21 19:21, Jason Gunthorpe wrote:
> 
> Hi,
> 
> > Not really, once one thing in an applicate uses a large number FDs the
> > entire application is effected. If any open() can return 'very big
> > number' then nothing in the process is allowed to ever use select.
> 
> isn't that a bug in select() ?

<shrug> it is what it is, select has a fixed size bitmap of FD #s and
a hard upper bound on that size as part of the glibc ABI - can't be
fixed.

Jason