On Mon, Apr 26, 2021 at 3:31 AM Chris Murphy <li...@colorremedies.com> wrote:
> On Sun, Apr 25, 2021 at 12:39 PM Artem Tim <ego.corda...@gmail.com> wrote: > > Upcoming 5.12 allow building with dynamic preemption support which > allows changing mode at boot/run-time so finally no need to rebuild or make > alternative kernel build anymore[1]. Responsive system is a must have for > gaming and good desktop experience overall, not only for professional > audio. For example difference in input mouse lag is like day and night with > PREEMPT mode. Maybe on cheap mouse this is hard to notice but on 500-1000Hz > mouse really easy. You can test this yourself with experimental kernel > build on COPR[2]. Some Linux distros[3] already using PREEMPT mode by > default for a decent period of time. Fedora kernel build with > CONFIG_PREEMPT_VOLUNTARY but this is not enough for desktop use case. > > > > Please provide full PREEMPT mode by default in 5.12 kernel for desktop > variants. With 5.12 it is possible for user to change it without efforts if > they need this. > > > > I see CONFIG_HAVE_PREEMPT_DYNAMIC=y with kernel > 5.12.0-0.rc8.191.fc35.x86_64+debug. > CONFIG_HAVE_PREEMPT_DYNAMIC only says the architecture supports the feature. This is hard-coded by arch/x86/Kconfig. To actually enable the feature, CONFIG_PREEMPT=y would have to be set. The combination of CONFIG_PREEMPT and CONFIG_HAVE_PREEMPT_DYNAMIC then selects CONFIG_PREEMPT_DYNAMIC. See kernel/Kconfig.preempt. Michal
_______________________________________________ devel mailing list -- devel@lists.fedoraproject.org To unsubscribe send an email to devel-le...@lists.fedoraproject.org Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/ List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/devel@lists.fedoraproject.org Do not reply to spam on the list, report it: https://pagure.io/fedora-infrastructure
