Date: Tue, 15 Nov 2022 10:37:36 -0700 From: Warner Losh <imp@bsdimp.com> To: "freebsd-arch@freebsd.org" <freebsd-arch@freebsd.org> Subject: Giant Locked drivers Message-ID: <CANCZdfrfNzb1O91T4ivMXPsUGu7mYX80pJxvQu07oe2AF=YXCw@mail.gmail.com>
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[-- Attachment #1 --] Greetings, It's no secret fiant-locked drivers' days are numbered. We've been more sluggish about eliminating Giant than had been hoped. I plan in the coming weeks to add a tunable 'debug.giant_drivers' which initially will be set to enable/disable giant-locked drivers in the tree. When set to 0, you get today's behavior. If set to 1, it will no longer allow drivers that don't request MPSAFE interrupt handlers from registering (the interrupt setup will return an error). This will allow us to understand what is lost if we throw the switch, and allow users to proactively test their systems to see if they are affected or not (and if they are, if they want to live without the functionality, or want to fund work in the area). Comments? Warner [-- Attachment #2 --] <div dir="ltr">Greetings,<div><br></div><div>It's no secret fiant-locked drivers' days are numbered. We've been more sluggish about eliminating Giant than had been hoped. I plan in the coming weeks to add a tunable 'debug.giant_drivers' which initially will be set to enable/disable giant-locked drivers in the tree.</div><div><br></div><div><div>When set to 0, you get today's behavior. If set to 1, it will no longer allow drivers that don't request MPSAFE interrupt handlers from registering (the interrupt setup will return an error).</div><div><br></div><div>This will allow us to understand what is lost if we throw the switch, and allow users to proactively test their systems to see if they are affected or not (and if they are, if they want to live without the functionality, or want to fund work in the area).</div><div><br></div><div>Comments?</div><div><br></div><div>Warner</div></div></div>
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